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data sheet rev. 1.2 / august 2011 zled 7030 high current 40v led driver with switch dimming
ZLED7030 high current 40v led driver with switch dimming ? 2011 zentrum mikroelektronik dresden ag rev. 1.2 all rights reserved. the material contained herein may not be reproduced, adapted, merged, translated, stored, or used without the prior written consent of the copyright owner. the information furnished in this publication is su bject to changes without notice. vin i sense lx gnd zled7x30 d1 led string vs = 8.5 to 40 vdc (c3) rs l1 33 to 220 h c2 0.1f dim1 dim2 gnd/floating gnd/floating switch c1 220f brief description the zled7x30 continuous-mode inductive step- down converter family is one of our zled led- control ics. it is designed for applications requir ing high brightness and high current. the zled7x30 can efficiently drive a single led or multiple series-connected leds from a voltage input higher than the led forward voltage (vin = 8.5 to 40vdc). it provides an adjustable output current (1.2a maximum), which is set via an external resistor and controlled by the zled7x30s integrated high-side output current-sensing circuit and high speed internal 40v power switch. its low conducting impedance ensures high system effi- ciency. the zled7x30 provides a switch dimming func- tion. it detects external switch action to adjust o ut- put current, allowing dimming functionality to be achieved without changing the original lighting sys - tem circuitry. the switch dimming is implemented in either two- level mode or three-level mode. the output current of every level and the total number of levels are customer selected by setting the corresponding input conditions of dim1 and dim2 pin. the zled7x30 enables diverse industrial and consumer lighting applications requiring high driving currents, wide operating voltage range, high efficiency, and variable brightness control. i t offers over-temperature and led open-circuit protection. the zled7x30 can also minimize bill- of-material costs because very few external components are required for most applications. only a resistor, a diode, an inductor, and three capacitors are needed for a typical basic application. zled7x30 typical application circuit features switch dimming with multiple levels three modes for output level settings up to 1.2a output current internal 40v power switch wide dc input voltage range 8.5 to 40 vdc output current accuracy: 5% (typical) led open-circuit protection thermal shutdown protection benefits high efficiency: up to 98% very few external components needed for operation adds switch dimming function to existing installation available support evaluation kit physical characteristics operating temperature: -40c to 105c switching frequency: up to 1mhz sop-8 package zled7x30 family selection matrix product max. current output package ZLED7030 1.2a sop-8 zled7330 1.0a sop-8 zled7530 0.75a sop-8 zled7730 0.35a sop-8 for additional information on our zled driver family, visit www.zmdi.com/products/led-drivers/
ZLED7030 high current 40v led driver with switch dimming ? 2011 zentrum mikroelektronik dresden ag rev. 1.3 all rights reserved. the material contained herein may not be reproduced, adapted, merged, translated, stored, or used without the prior written consent of the copyright owner. typical applications illuminated led signs and other displays interior/exterior led lighting led street and traffic lighting (low voltage) mr16 led spot lights architecture/building led lighting retrofit led lighting fixtures led backlighting general purpose industrial and consumer led applica tions zled7x30 block diagram ordering information product sales code description package ZLED7030-zi1r ZLED7030 C high current (1200ma) 40v led driver wit h switch dimming sop-8 (tape & reel) zled7330-zi1r zled7330 C high current (1000ma) 40v led driver wit h switch dimming sop-8 (tape & reel) zled7530-zi1r zled7530 C high current (750ma) 40v led driver with switch dimming sop-8 (tape & reel) zled7730-zi1r zled7730 C high current (350ma) 40v led driver with switch dimming sop-8 (tape & reel) ZLED7030kit-d1 ZLED7030-d1 demo board, 1 zled-pcb8 and 5 ZLED7030 ics kit zled-pcb8 test pcb with one 5w white high brightness (hb) led , cascadable to one multiple led string printed circuit board (pcb) sales and further information www.zmdi.com led_drivers@zmdi.com zentrum mikroelektronik dresden ag (zmd ag) grenzstrasse 28 01109 dresden germany zmd america, inc. 8413 excelsior drive suite 200 madison, wi 53717 usa zentrum mikroelektronik dresden ag, japan office 2nd floor, shinbashi tokyu bldg. 4-21-3, shinbashi, minato-ku tokyo, 105-0004 japan zmd far east, ltd. 3f, no. 51, sec. 2, keelung road 11052 taipei taiwan phone +49 (0)351.8822.7.533 fax +49 (0)351.8822.8.7533 phone +1 (608) 829-1987 fax +1 (631) 549-2882 phone +81.3.6895.7410 fax +81.3.6895.7301 phone +886.2.2377.8189 fax +886.2.2377.8199 disclaimer : this information applies to a product under devel opment. its characteristics and specifications are subject to change without notice. zentrum mikroelek tronik dresden ag (zmd ag) assumes no obligation regarding future manufacture unless otherwise agree d to in writing. the information furnished hereby i s believed to be true and accurate. however, under no circumstances shall zmd ag be liable to any custo mer, licensee, or any other third party for any special, indirect, in cidental, or consequential damages of any kind or n ature whatsoever arising out of or in any way relat ed to the furnishing, performance, or use of this t echnical data. zmd ag hereby expressly disclaims any liability of zmd ag to any customer, licensee or any other third party, and any such customer, licensee and any other thir d party hereby waives any liability of zmd ag for a ny damages in connection with or arising out of the furnishing, p erformance or use of this technical data, whether b ased on contract, warranty, tort (including neglige nce), strict liability, or otherwise . trim 8 v s 6 to 40 vdc 5 dim2 lx gnd 7 2 zled7x30 vdda vddd n led l1 d1 (c3) (c1) c2 0.1f rs v in 1 vcc i sense i sense uv por v ref v in sd sd dr i sense and driver power mos 33h to 220h 6 dim1 power supply, oscillator and under- voltage detection (uv) clk shut- down dim select s analog dim logic vcc sd
ZLED7030 high current 40v led driver with switch dimming data sheet august 16, 2011 ? 2011 zentrum mikroelektronik dresden ag rev.1.2 all rights reserved. the material contained herein may not be reproduced, adapted, merged, translated, stored, or used without the prior written consent of the copyright owner. t he information furnished in this publication is subject to changes without notice. 4 of 23 contents 1 ic characteristics ................................ ................................................... ................................................... .................... 6 1.1 absolute maximum ratings ........................... ................................................... ................................................... .. 6 1.2 operating conditions .............................. ................................................... ................................................... ......... 6 1.3 electrical parameters ............................... ................................................... ................................................... ........ 7 1.4 typical operation graphs .......................... ................................................... ................................................... ...... 8 2 circuit description ............................... ................................................... ................................................... .................. 13 2.1 zled7x30 overview .................................. ................................................... ................................................... .... 13 2.2 control of output current via external sense resisto r rs .............................................. .................................... 13 2.3 multi-mode switch dimming .......................... ................................................... ................................................... . 13 2.4 zled7x30 protection features ........................ ................................................... ................................................. 1 4 2.4.1 thermal shut-down protection ........................ ................................................... .......................................... 14 2.4.2 led open-load protection ............................ ................................................... ............................................ 14 3 application circuit design.......................... ................................................... ................................................... ............ 15 3.1 applications ....................................... ................................................... ................................................... ............. 15 3.2 thermal considerations for application design ...... ................................................... .......................................... 16 3.2.1 temperature effects of load, layout, and component se lection ........................................... ...................... 16 3.2.2 temperature effects of low supply voltage v in .................................................. ......................................... 16 3.3 external component selection ...................... ................................................... ................................................... . 16 3.3.1 sense resistor rs .................................. ................................................... ................................................... 16 3.3.2 inductor l1 ....................................... ................................................... ................................................... ....... 17 3.3.3 bypass capacitor c1 ................................ ................................................... ................................................. 1 8 3.3.4 de-bouncing capacitor c2........................... ................................................... .............................................. 20 3.3.5 capacitor c3 for reducing output ripple ........... ................................................... ....................................... 20 3.3.6 diode d1 .......................................... ................................................... ................................................... ....... 20 3.4 application circuit layout requirements ............ ................................................... .............................................. 20 4 esd protection ....................................... ................................................... ................................................... ............... 21 5 pin configuration and package ....................... ................................................... ................................................... ...... 21 6 ordering information .............................. ................................................... ................................................... ............... 22 7 document revision history ......................... ................................................... ................................................... .......... 23
ZLED7030 high current 40v led driver with switch dimming data sheet august 16, 2011 ? 2011 zentrum mikroelektronik dresden ag rev.1.2 all rights reserved. the material contained herein may not be reproduced, adapted, merged, translated, stored, or used without the prior written consent of the copyright owner. t he information furnished in this publication is subject to changes without notice. 5 of 23 list of figures figure 1.1 zled7x30 supply operating current vs. input supply volt age (v in = 8.5 to 40v) ..................................... .... 8 figure 1.2 efficiency (%) vs. input supply voltage (v in = 8.5 to 40v) per number of leds (rs=0.10 , l1=47 h)........ 8 figure 1.3 efficiency vs. input supply voltage (v in = 8.5 to 40v) per number of leds (rs=0.15 , l1=47 h) .............. 9 figure 1.4 efficiency vs. input supply voltage (v in = 8.5 to 40v) ? per number of leds (rs=0.30 , l1=47 h) ............. 9 figure 1.5 output current variation vs. input supply voltage (v in = 8.5 to 40v) per number of leds (rs=0.15 , l1=47 h) ................................................ ................................................... ............................... 10 figure 1.6 sense voltage vs. operating temperature (rs=0.10 , l1=47 h, v in = 40 v) ........................................... . 10 figure 1.7 switch dimming waveform (dimming mode 2) ........... ................................................... .............................. 11 figure 1.8 led open-circuit protection (rs=0.30 , l1=47 h, v in = 24 v) ........................................... ....................... 12 figure 3.1 zled7x30 application circuit for switch dimming ...... ................................................... .............................. 15 figure 3.2 basic zled7x30 application circuit with output current determined only by rs ............................ ............ 15 figure 3.3 zled7x30 application circuit using a halogen electroni c transformer to operate with ac line supply .... 16 figure 5.1 zled7x30 pin configuration .......................... ................................................... ........................................... 21 list of tables table 2.1 dimming configuration options ..................... ................................................... ............................................ 14 table 3.1 recommended values for sense resistor rs............. ................................................... .............................. 17 table 5.1 zled7x30 pin descriptionssop-8 package................ ................................................... .......................... 21 table 5.2 package dimensions sop-8 ............................ ................................................... ......................................... 22
ZLED7030 high current 40v led driver with switch dimming data sheet august 16, 2011 ? 2011 zentrum mikroelektronik dresden ag rev.1.2 all rights reserved. the material contained herein may not be reproduced, adapted, merged, translated, stored, or used without the prior written consent of the copyright owner. t he information furnished in this publication is subject to changes without notice. 6 of 23 1 ic characteristics note: exceeding the maximum ratings given in this s ection could cause operation failure and/or cause p ermanent damage to the zled7x30. exposure to these condition s for extended periods may affect device reliabilit y. 1.1 absolute maximum ratings no. parameter symbol conditions min typ max unit 1.1.1 input voltage (also see specification 1.2.2) v in -0.3 50 v 1.1.2 i sense pin voltage v isense v in 5v v in -5v v in +0.3v v v in <5v -0.3v v in +0.3v v 1.1.3 lx pin output voltage v lx -0.3 50 v 1.1.4 dim1, dim2 pin input voltage v dim -0.3 6 v 1.1.5 lx pin switch output current i lx 1.5 a 1.1.6 power dissipation p tot 0.5 w 1.1.7 esd performance human body model 3 kv 1.1.8 junction temperature t j 150 c 1.1.9 junction to ambient thermal resistance r ja 100 k/w 1.1.10 storage temperature t s -55 150 c 1.2 operating conditions no. parameter symbol conditions min typ max unit 1.2.1 operating temperature t amb -40 105 c 1.2.2 input voltage (also see specification 1.1.1) v in 8.5 40 v
ZLED7030 high current 40v led driver with switch dimming data sheet august 16, 2011 ? 2011 zentrum mikroelektronik dresden ag rev.1.2 all rights reserved. the material contained herein may not be reproduced, adapted, merged, translated, stored, or used without the prior written consent of the copyright owner. t he information furnished in this publication is subject to changes without notice. 7 of 23 1.3 electrical parameters except as noted, test conditions for the following specifications are t amb = 25c typical and v in = 12v unless otherwise noted. production testing of the chip is performed at 25c unless otherwise stated. functional operation of t he chip and specified parameters at other temperatures are guar anteed by design, characterization, and process con trol. no. parameter symbol conditions min typ max unit 1.3.1 quiescent supply current i inqoff output off 70 120 140 a i inqon output switching 450 600 a 1.3.2 mean current sense threshold voltage v sense 95 100 105 mv 1.3.3 sense threshold hysteresis v sensehys 15 % 1.3.4 i sense pin input current i sense v sense = v in -0.1v 8 a 1.3.5 under-voltage lockout threshold v uvlo v in rising 5.05 5.85 6.65 v 1.3.6 under-voltage lockout hysteresis d v uvlo 1.65 v 1.3.7 ratio of output current level to initial current in dimming mode 1 k 1 dim1: f loating dim2: gnd level 1 100 % level 2 50 % level 3 17 20 23 % 1.3.8 ratio of output current level to initial current in dimming mode 2 k 2 dim1: gnd dim2: floating level 1 100 % level 2 60 % level 3 28 30 32 % 1.3.9 ratio of output current level to initial current in dimming mode 3 k 3 dim1: gnd dim2: gnd level 1 100 % level 2 28 30 32 % 1.3.10 interval time between external switch actions t s 2 s 1.3.11 lx switch continuous current i lxmean_0 ZLED7030 1.2 a i lxmean_3 zled7330 1.0 a i lxmean_5 zled7530 0.75 a i lxmean_7 zled7730 0.35 a 1.3.12 lx switch leakage current i lx(leak) 1 a 1.3.13 lx switch on resistance r lx 0.3 0.4 1.3.14 minimum switch on time t onmin lx switch on 200 ns 1.3.15 minimum switch off time t offmin lx switch off 200 ns 1.3.16 recommended operating frequency maximum f lxmax 1 mhz
ZLED7030 high current 40v led driver with switch dimming data sheet august 16, 2011 ? 2011 zentrum mikroelektronik dresden ag rev.1.2 all rights reserved. the material contained herein may not be reproduced, adapted, merged, translated, stored, or used without the prior written consent of the copyright owner. t he information furnished in this publication is subject to changes without notice. 8 of 23 0 100 200 300 400 500 600 5 10 15 20 25 30 35 40 vin(v) icc(ua) rs=0.10 0.6 0.65 0.7 0.75 0.8 0.85 0.9 0.95 1 5 10 15 20 25 30 35 40 vin(v) effiency(%) 1led 3led 7led 10led no. parameter symbol conditions min typ max unit 1.3.17 recommended output switch duty cycle range at f lxmax d lx 0.3 0.9 1.3.18 propagation delay of internal comparator t pd 25 ns 1.3.19 thermal shutdown temperature t sd 150 c 1.3.20 thermal shutdown hysteresis t sd-hys 20 k 1.4 typical operation graphs the curves are valid for the typical application ci rcuit and t amb = 25c unless otherwise noted. figure 1.1 zled7x30 supply operating current vs. inp ut supply voltage (v in = 8.5 to 40v) figure 1.2 efficiency (%) vs. input supply voltage (v in = 8.5 to 40v) ? per number of leds (rs=0.10 , l1=47 h) ? minimum v in depends on number of leds.
ZLED7030 high current 40v led driver with switch dimming data sheet august 16, 2011 ? 2011 zentrum mikroelektronik dresden ag rev.1.2 all rights reserved. the material contained herein may not be reproduced, adapted, merged, translated, stored, or used without the prior written consent of the copyright owner. t he information furnished in this publication is subject to changes without notice. 9 of 23 rs=0.15 0.6 0.65 0.7 0.75 0.8 0.85 0.9 0.95 1 5 10 15 20 25 30 35 40 vin(v) effiency(%) 1led 3led 7led 10led rs=0.30 0.6 0.65 0.7 0.75 0.8 0.85 0.9 0.95 1 5 10 15 20 25 30 35 40 vin(v) effiency(%) 1led 3led 7led 10led figure 1.3 efficiency vs. input supply voltage (v in = 8.5 to 40v) ? per number of leds (rs=0.15 , l1=47 h) figure 1.4 efficiency vs. input supply voltage (v in = 8.5 to 40v) ? per number of leds (rs=0.30 , l1=47 h) ? minimum v in depends on number of leds.
ZLED7030 high current 40v led driver with switch dimming data sheet august 16, 2011 ? 2011 zentrum mikroelektronik dresden ag rev.1.2 all rights reserved. the material contained herein may not be reproduced, adapted, merged, translated, stored, or used without the prior written consent of the copyright owner. t he information furnished in this publication is subject to changes without notice. 10 of 23 rs=0.15 0.6 0.61 0.62 0.63 0.64 0.65 0.66 0.67 0.68 0.69 0.7 5 10 15 20 25 30 35 40 vin(v) iout(a) 1led 3led 7led 10led 97.8 98.0 98.2 98.4 98.6 98.8 99.0 99.2 99.4 -40 -30 -20 -10 0 10 20 30 40 50 60 70 80 90 100 110 vsense(mv) v sense (mv) temperature ( c) figure 1.5 output current variation vs. input supply voltage (v in = 8.5 to 40v) per number of leds (rs=0.15 , l1=47 h) figure 1.6 sense voltage vs. operating temperature (r s=0.10 , l1=47 h, v in = 40 v) minimum v in depends on number of leds.
ZLED7030 high current 40v led driver with switch dimming data sheet august 16, 2011 ? 2011 zentrum mikroelektronik dresden ag rev.1.2 all rights reserved. the material contained herein may not be reproduced, adapted, merged, translated, stored, or used without the prior written consent of the copyright owner. t he information furnished in this publication is subject to changes without notice. 11 of 23 trigger c1 dc stop -150mv edge negative timebase -1.04 s roll 1.00s/div 500ks 50 ks/s 100% 60% 30% figure 1.7 demonstrates a typical switch dimming wa veform. channel 1 (blue) is the supply voltage. cha nnel 4 (magenta) shows the output current at 100%, then 60 %, and then 30%. figure 1.7 switch dimming waveform (dimming mode 2)
ZLED7030 high current 40v led driver with switch dimming data sheet august 16, 2011 ? 2011 zentrum mikroelektronik dresden ag rev.1.2 all rights reserved. the material contained herein may not be reproduced, adapted, merged, translated, stored, or used without the prior written consent of the copyright owner. t he information furnished in this publication is subject to changes without notice. 12 of 23 trigger c1 dc stop 15.0v edge negative timebase -5.2 s roll 5.00s/div 500ks 10 ks/s figure 1.8 led open-circuit protection (rs=0.30 , l1=47 h, v in = 24 v)
ZLED7030 high current 40v led driver with switch dimming data sheet august 16, 2011 ? 2011 zentrum mikroelektronik dresden ag rev.1.2 all rights reserved. the material contained herein may not be reproduced, adapted, merged, translated, stored, or used without the prior written consent of the copyright owner. t he information furnished in this publication is subject to changes without notice. 13 of 23 rs v1.0 i outnom = rs v1.0 k i x dim out * = 2 circuit description 2.1 zled7x30 overview the zled7x30 is a continuous-mode inductive step-do wn converter led driver for driving single or multi ple series-connected leds from a voltage input higher t han the led voltage (vin = 8.5 to 40vdc; see sectio n 3.2.2 for important details). the zled7x30 provides an ad justable output current (1.2a maximum for ZLED7030; 1.0a maximum for zled7330; 0.75a maximum for zled7530; 0 .35a maximum for zled7730) , which is nominally set via an external sense resistor rs and controlled by the zled7x30s integrated high-side output current -sensing circuit and output switch. the zled7x30 detects ext ernal switching action on the supply line to adjust the output current in different modes on different levels. only a resistor, a diode, an inductor, and three ca pacitors are needed for a typical basic application . refer to the application circuits in section 3 for the location of the components referred to in the following sect ions. 2.2 control of output current via external sense re sistor rs external sense resistor rs, which is connected betw een the v in and i sense pins as shown in figure 3.1, sets i outnom , the nominal average output current. equation (1) can be used to calculate the nominal output current , which is the lx switch output current i lx if no switch dimming condition is valid. see secti on 3.3.1 for recom- mended values for rs in a typical basic application and section 3.4 for layout guidelines for rs. (1) 2.3 multi-mode switch dimming the zled7x30 detects external switching action on t he supply line to adjust output current, allowing d imming functionality to be achieved without changing the o riginal lighting system circuitry. the switch dimmi ng is imple- mented in either two-level mode or three-level mode . the output current of each level and the total nu mber of levels are customer selected by setting the corresp onding input conditions on the dim1 and dim2 pins. see page 2 for a typical application using the dim1 and dim2 pins. the output current is set at the initial 100% value determined by the sense resistor rs the first time that power is supplied to the chip. after the initial power up se quence, the chip adjusts the output current accordi ng to the external switch action. after the lowest current le vel, the current cycles back to the initial value i f subsequent switch action is detected. if the power is switched off for longer than 2 seconds, the device will ret urn to its initial state and the output current will be set to the ini tial value the next time that power is applied. there are two types of switch action: a normal swit ch, which has an off-time between each subsequent s witch action longer than 2s, and a dimming switch, which has an off-time between each subsequent switch less than 2s. the dimmed average output current is given by (2) where
ZLED7030 high current 40v led driver with switch dimming data sheet august 16, 2011 ? 2011 zentrum mikroelektronik dresden ag rev.1.2 all rights reserved. the material contained herein may not be reproduced, adapted, merged, translated, stored, or used without the prior written consent of the copyright owner. t he information furnished in this publication is subject to changes without notice. 14 of 23 k x = current ratio to initial current (see section 1. 3). the input conditions on the dim1 and dim2 pins set the number of current levels and the current ratio relative to the initial average current for the dimming switch (ds) sequences as shown in table 2.1. table 2.1 dimming configuration options dimming mode dim1 dim2 dimming ratio k no dimming floating floating (100%) 1 floating gnd 100% 1 st ds 50% 2 nd ds 20% 3 rd ds 100% 2 gnd floating 100% 1 st ds 60% 2 nd ds 30% 3 rd ds 100% 3 gnd gnd 100% 1 st ds 30% 2 nd ds 100% if a normal switch is detected or if dim1 and dim2 are both floating, the output current goes back to the initial state of 100% nominal average output current. since zled7x30 needs to count the time for more than 2 s econds after the switch is off during a normal switch, one capacitor (c1) equal to or greater than 220 f is required to keep the chip working in low quiescent current mode during this part of the off-time. 2.4 zled7x30 protection features 2.4.1 thermal shut-down protection the zled7x30 automatically protects itself from dam age due to over-temperature conditions. if the zled 7x30s temperature exceeds the thermal shutdown threshold (t sd = 150c, typical), the zled7x30 will shutdown. to avoid erratic zled7x30 operation, a 20k hysteresis (t sd-hys ) is applied that prevents it from returning to ope ration until its temperature falls below the hysteresis th reshold (t sd - t sd-hys ). also refer to section 3.2 for additional thermal considerations. 2.4.2 led open-load protection as a step-down converter, the zled7x30 has inherent open-load circuit protection. since the l1 inducto r is connected in series with the led string, the curren t flow is interrupted if the load is open and the l x output of the zled7x30 will not be damaged. this provides an adva ntage over other products such as boost converters, for which the internal switch can be damaged by back em f forcing the drain above its breakdown voltage.
ZLED7030 high current 40v led driver with switch dimming data sheet august 16, 2011 ? 2011 zentrum mikroelektronik dresden ag rev.1.2 all rights reserved. the material contained herein may not be reproduced, adapted, merged, translated, stored, or used without the prior written consent of the copyright owner. t he information furnished in this publication is subject to changes without notice. 15 of 23 vin i sense lx gnd zled7x30 d1 led string vs = 8.5 to 40 vdc (c3) rs l1 33 to 220 h c2 0.1f dim1 dim2 gnd/floating gnd/floating switch c1 220f vin i sense lx gnd zled7x30 d1 led string vs = 8.5 to 40 vdc (c3) rs l1 33 to 220 h c2 0.1f dim1 dim2 (c1) 3 application circuit design 3.1 applications the zled7x30 is designed for applications requiring features such as high-speed switching, variable br ightness control, operation with voltages up to 40v, high ef ficiency, or protection from over-temperature, or o pen led circuit conditions. typical applications include mr16/mr11 led spot lig hts, led street lights, parabolic aluminized reflec tor (par) led lights, and other general purpose industrial an d consumer led applications. figure 3.1 shows the minimum configuration for swit ch dimming applications. figure 3.2 demonstrates th e basic application circuit with the additional capacitors c1 and c3 for enhanced performance. for dimensionin g of the current sense resistor, see section 2. an example o f operation with a halogen lamp electronic transfor mer is shown in figure 3.3. figure 3.1 zled7x30 application circuit for switch di mming figure 3.2 basic zled7x30 application circuit with o utput current determined only by rs
ZLED7030 high current 40v led driver with switch dimming data sheet august 16, 2011 ? 2011 zentrum mikroelektronik dresden ag rev.1.2 all rights reserved. the material contained herein may not be reproduced, adapted, merged, translated, stored, or used without the prior written consent of the copyright owner. t he information furnished in this publication is subject to changes without notice. 16 of 23 figure 3.3 zled7x30 application circuit using a halo gen electronic transformer to operate with ac line su pply 3.2 thermal considerations for application design 3.2.1 temperature effects of load, layout, and comp onent selection do not exceed the package power dissipation limits by driving high load currents or by operating the c hip at high ambient temperatures. power dissipation also increa ses if the efficiency of the circuit is low as coul d result from selecting the wrong coil or from excessive parasiti c output capacitance on the switch output. see the layout guidelines in section 3.4. 3.2.2 temperature effects of low supply voltage v in until the supply input voltage on the v in pin has risen above the internally-set startup thre shold, the zled7x30s internal regulator disables the drive to the intern al power mosfet output switch. above this threshold , the mosfet on-resistance is low enough for the chip to start to operate; however, if the supply voltage re mains below the specified minimum (8.5v), the duty cycle of the output switch will be high and the zled7x30 power dissipation will be at a maximum. avoid operating t he zled7x30 under such conditions to reduce the ris k of damage due to exceeding the maximum die temperature . when driving multiple leds, their combined forwar d voltage drop is typically high enough to prevent th e chip from switching when v in is below 8.5v, so there is less risk of thermal damage. 3.3 external component selection note: also see section 3.4 for layout guidelines fo r the following external components. 3.3.1 sense resistor rs table 3.1 gives values for rs under normal operatin g conditions in the typical application shown in fi gure 3.1. these values assume that no dimming condition is va lid. under the conditions given the table, in order to maintain the switch current below the maximum value specifie d in section 1, 0.082 is the minimum value for rs for the ZLED7030, 0.1 for the zled7330, 0.13 for the zled7530 and 0.27 for the zled7730.
ZLED7030 high current 40v led driver with switch dimming data sheet august 16, 2011 ? 2011 zentrum mikroelektronik dresden ag rev.1.2 all rights reserved. the material contained herein may not be reproduced, adapted, merged, translated, stored, or used without the prior written consent of the copyright owner. t he information furnished in this publication is subject to changes without notice. 17 of 23 ) (* * lx l s avg led in on r r r i v v i l t + + - - d = ) (* * l s avg d led off r r i v v i l t + + + d = to ensure stable output current, use a 1% accuracy resistor with adequate power tolerance and a good temperature characteristic for rs. table 3.1 recommended values for sense resistor rs nominal average output current (ma) value for r s ( ) 1200 (maximum for ZLED7030) 0.082 1000 (maximum for zled7330) 0.1 750 (maximum for zled7530) 0.13 667 0.15 350 (maximum for zled7730) 0.27 333 0.3 3.3.2 inductor l1 the recommended range for the l1 inductor is 33 h to 220 h. select the inductor value for l1 as needed to ensure that switch on/off times are optimized acros s the load current and supply voltage ranges. if th e application requires a high supply voltage and low output curre nt, inductance values at the high end of this range are recommended to minimize errors due to switching del ays, which can reduce efficiency and increase rippl e on the output. also see section 3.4 for layout considerations for l1. equations (3) and (4) can be used to calculate t on and t off . on time for lx switch (t onmin >200ns): (3) off time for lx switch (t offmin >200ns): (4) where: symbol description l l1 coil inductance in h ? i l1 coil peak-peak ripple current in a (internally s et to 0.3 * i avg ) v in supply voltage in v v led total forward voltage in v for led string i avg nominal average led current in a rs external current sense resistor in r l l1 coil resistance in r lx lx switch resistance in v d d1 diode forward voltage at the required load curr ent in v
ZLED7030 high current 40v led driver with switch dimming data sheet august 16, 2011 ? 2011 zentrum mikroelektronik dresden ag rev.1.2 all rights reserved. the material contained herein may not be reproduced, adapted, merged, translated, stored, or used without the prior written consent of the copyright owner. t he information furnished in this publication is subject to changes without notice. 18 of 23 khz 8. 121 s 56.5 s 64.2 1 t t 1 f off on lx = + = + = m m 3.0 s 56.5 s 64.2 s 64.2 t t t v12 v4.3 v v d off on on in led lx ? + = + ? = = m m m ( ) s a v v a h t off m m 56.5 26.0 30.0 333.0 36.0 4.3 333.0 3.0 220 = w + w * + + * * = ( ) s a v v a h t on m m 64.2 27.0 26.0 3.0 333.0 4.3 12 333.0 3.0 220 = w + w + w * - - * * = the inductance value has an equivalent effect on t on and t off and therefore affects the switching frequency. for the same reason, the inductance has no influence on the duty cycle, for which the relationship of the summed led forward voltages n * v f to the input voltage v in is a reasonable approximation. because the input v oltage is a factor in the on time, variations in the input volt age affect the switching frequency and duty cycle. to achieve optimum performance, duty cycles close t o 0.5 at the nominal average supply voltage are pre ferable for improving the temperature stability of the outp ut current. equations (5), (6), (7), and (8) provide an example of calculating t on , t off , operating frequency f lx , and duty cycle d lx when using a 220 h inductor for l1 and v in =12v, rs = 0.30 , r l =0.26 , v led =3.4v, i avg =333ma, v d =0.36v, and r lx =0.27 . example: (5) (6) (7) (8) for the l1 inductor, use a coil with a continuous c urrent rating higher than the required mean output current and a saturation current that exceeds the peak output cur rent by 30% to 50% for robustness against transient con- ditions; e.g., during start-up. 3.3.3 bypass capacitor c1 the bypass capacitor c1 has two functions: maintain ing operating voltage and bypassing the current rip ple of the switching converter. in general, low esr capacitors must be used. if the circuit is supplied by rectified line voltag e, c1 must provide enough charge to maintain the zl ed7x30s minimum operating voltage as well as the forward vo ltage of the led string to keep the application wor king even if the rectified supply voltage periodically drops below these values. a rough estimate for the minimu m capacity needed can be calculated with equation (9).
ZLED7030 high current 40v led driver with switch dimming data sheet august 16, 2011 ? 2011 zentrum mikroelektronik dresden ag rev.1.2 all rights reserved. the material contained herein may not be reproduced, adapted, merged, translated, stored, or used without the prior written consent of the copyright owner. t he information furnished in this publication is subject to changes without notice. 19 of 23 lx max lx f max d avg min f v d i v t i c * d * = d = * 1 f 135 v2.3*3 2 *v24 ms 10*a 33.0 1c min m = - = ripple on avg min v t i c * 1 = (9) where: symbol description i avg average nominal led string current assuming that the contribution of the ic supply current is negligible. t d discharge time at given ac frequency. will be a maxi mum of 10ms (? period duration) at 50hz. ? v max peak rectified supply voltage minus led string forwar d voltage or minimum zled7x30 supply voltage, whichever is greater. example: for an application with 3 leds with 3.2v f orward voltage each driven at 0.33a and supplied wi th rectified 24vac, a minimum bypass capacitor c1 of 2 20 f or 330 f might be adequate. compared to the calculation, a safety margin of about 50% must be a dded to consider temperature effects and aging. (10) a second function of c1 is to bypass the current ri pple of the switching converter and thus prevent it from disturbing a stable ic supply or backlash on the po wer supply circuit. for this reason even in dc-supp lied applications, the use of an adequate c1 might be us eful. the defining parameters are now as shown in equation (11): (11) where: symbol description i avg average nominal led string current. t on on time of the internal mosfet output switch. note: t on must be longer than t onmin =200ns. v ripple permissible voltage ripple on the supply voltage.
ZLED7030 high current 40v led driver with switch dimming data sheet august 16, 2011 ? 2011 zentrum mikroelektronik dresden ag rev.1.2 all rights reserved. the material contained herein may not be reproduced, adapted, merged, translated, stored, or used without the prior written consent of the copyright owner. t he information furnished in this publication is subject to changes without notice. 20 of 23 nf 367 1.0*v24 s 67.2*a 33.0 1c min = = m example: for an application of 3 leds driven at 0.3 3a and supplied with 24vdc, a maximum ripple of 10% is allowed. the zled7x30 is operated at 150khz with a duty cycle of 0.4 leading to an on time of 2.67 s. as calculated in equation 12, a capacitor c1 of 470nf may be adequate, again including a safety margin of about 50%. (12) to achieve maximum stability over temperature and v oltage, an x7r, x5r, or better dielectric is recomm ended while y5v must be avoided. 3.3.4 de-bouncing capacitor c2 external capacitor c2 minimizes ground bounce durin g switching of the internal mosfet output switch. g round bounce is typically caused by parasitic inductance and resistance due to the distance between the grou nds for the power supply and the zled7x30 gnd pin. use a 0.1 f, x7r ceramic capacitor to ground for c2. 3.3.5 capacitor c3 for reducing output ripple if required, the c3 can be used to reduce peak-to-p eak ripple current in the led string. low esr capac itors should be used because the efficiency of c3 largely depends on its esr and the dynamic resistance of t he leds. for an increased number of leds, using the same cap acitor will be more effective. lower ripple can be achieved with higher capacitor values, but this will increas e start-up delay by reducing the slope of the led v oltage as well as cause increased current during converter start-u p. the capacitor will not affect operating frequenc y or effici- ency. for a simulation or bench optimization, c3 va lues of a few f are an applicable starting point for the given configuration. ripple current reduction is approxim ately proportional to the value of c3. 3.3.6 diode d1 the flyback diode d1 must have a continuous current rating greater than the maximum output load curren t and a peak current rating higher than the peak l1 coil cu rrent. important: use a low-capacitance, fast schot tky diode that has low reverse leakage at the maximum operati ng temperature and maximum operating voltage for th e application to avoid excess power dissipation and o ptimize performance and efficiency. for silicon dio des, there is a concern that the higher forward voltage and incre ased overshoot from reverse recovery time could inc rease the peak lx pin voltage (v lx ). the total voltage v lx (including ripple voltage) must not be >50v. 3.4 application circuit layout requirements the following guidelines are strongly recommended w hen laying out application circuits: important: locate the l1 inductor and the c1 input decoupling capacitor as close as possible to the zled7x30 to minimize parasitic inductance and resis tance, which can compromise efficiency. use low resistance connections from l1 to the lx and v in pins. all circuit board traces to the lx pin must be as s hort as possible because it is a high-speed switchi ng node. to minimize ground bounce, locate the 0.1 f external capacitor c2 as close as possible to the v in pin and solder the zled7x30s gnd pin directly to the groun d plane. (also, see section 3.3.4 regarding ground bounce.)
ZLED7030 high current 40v led driver with switch dimming data sheet august 16, 2011 ? 2011 zentrum mikroelektronik dresden ag rev.1.2 all rights reserved. the material contained herein may not be reproduced, adapted, merged, translated, stored, or used without the prior written consent of the copyright owner. t he information furnished in this publication is subject to changes without notice. 21 of 23 because rs is typically a low value resistor, it is important to consider the resistance of the traces in series with r s as part of the total current sense resistance. use traces that are as short and wide as possible to minimize this effect. the zled7x30s dim pins are high impedance inputs. when left floating, these pins are pulled up to 3.3 v by internal circuitry. avoid running high voltage t races close to the dim pins. 4 esd protection all pins have an esd protection of 3 3000v according to the human body model (hbm). th e esd test follows the human body model with 1.5 k /100 pf based on mil 883-h, method 3015.8. 5 pin configuration and package figure 5.1 zled7x30 pin configuration table 5.1 zled7x30 pin descriptionssop-8 package pin no. description (also see section 3.3 for layout guidelines) v in 1 input voltage (8.5v to 40v). i sense 2 current adjustment input. resistor r s from i sense to v in determines the nominal average output current. i outnom =0.1v/r s nc 3 not connected; keep floating. nc 4 not connected; keep floating. dim2 5 set the number of current levels and current ratio o f each level of switch dimming function as follows: dim1 pin dim2 pin dimming mode floating floating no dimming floating gnd three levels: 100%, 50%, 20% gnd floating three levels: 100%, 60%, 30% gnd gnd two levels: 100%, 30% dim1 6 gnd 7 connect to gnd. lx 8 drain of internal power switch
ZLED7030 high current 40v led driver with switch dimming data sheet august 16, 2011 ? 2011 zentrum mikroelektronik dresden ag rev.1.2 all rights reserved. the material contained herein may not be reproduced, adapted, merged, translated, stored, or used without the prior written consent of the copyright owner. t he information furnished in this publication is subject to changes without notice. 22 of 23 sop8 package dimensions table 5.2 package dimensions sop-8 symbol dimension (mm) symbol dimension (mm, except ) min max min max a 1.350 1.750 e 3.800 4.000 a1 0.100 0.250 e1 5.800 6.240 a2 1.450 typical e 1.270 typical b 0.350 0.490 l 0.400 1.270 c 0.178 0.250 0 8 d 4.800 5.000 the sop-8 package has a thermal resistance (junctio n to ambient) of r ja = 128 k/w. 6 ordering information ordering information product sales code description package ZLED7030-zi1r ZLED7030 C high current (1200ma) 40v led driver wit h switch dimming sop-8 (tape & reel) zled7330-zi1r zled7330 C high current (1000ma) 40v led driver wit h switch dimming sop-8 (tape & reel) zled7530-zi1r zled7330 C high current (750ma) 40v led driver with switch dimming sop-8 (tape & reel) zled7730-zi1r zled7330 C high current (350ma) 40v led driver with switch dimming sop-8 (tape & reel) ZLED7030kit-d1 ZLED7030 demo kit 12vac/vdc, including 1 zled-pcb8 kit zled-pcb8 test pcb with one 5w white high brightness (hb) led , cascadable to one multiple led string printed circuit board (pcb) zled-pcb2 10 unpopulated test pcbs for modular led string wit h footprints of 9 common hb led types printed circuit board (pcb)
ZLED7030 high current 40v led driver with switch dimming data sheet august 16, 2011 ? 2011 zentrum mikroelektronik dresden ag rev.1.2 all rights reserved. the material contained herein may not be reproduced, adapted, merged, translated, stored, or used without the prior written consent of the copyright owner. t he information furnished in this publication is subject to changes without notice. 23 of 23 7 document revision history revision date description 1.0 14 th june, 2011 first issue. 1.1 9 th august, 2011 second issue. updated demo kit descripti on. updated typical application circuit, figures 3.1, 3.2 and 3.3. 1.2 16 th august, 2011 third issue. updated to include zled753 0 & zled7730. updated demo kit description sales and further information www.zmdi.com led_drivers@zmdi.com zentrum mikroelektronik dresden ag (zmd ag) grenzstrasse 28 01109 dresden germany zmd america, inc. 8413 excelsior drive suite 200 madison, wi 53717 usa zentrum mikroelektronik dresden ag, japan office 2nd floor, shinbashi tokyu bldg. 4-21-3, shinbashi, minato-ku tokyo, 105-0004 japan zmd far east, ltd. 3f, no. 51, sec. 2, keelung road 11052 taipei taiwan phone +49 (0)351.8822.7.533 fax +49 (0)351.8822.8.7533 phone +1 (608) 829-1987 fax +1 (631) 549-2882 phone +81.3.6895.7410 fax +81.3.6895.7301 phone +886.2.2377.8189 fax +886.2.2377.8199 disclaimer : this information applies to a product under devel opment. its characteristics and specifications are subject to change without notice. zentrum mikroelek tronik dresden ag (zmd ag) assumes no obligation regarding future manufacture unless otherwise agree d to in writing. the information furnished hereby i s believed to be true and accurate. however, under no circumstances shall zmd ag be liable to any custo mer, licensee, or any other third party for any special, indirect, in cidental, or consequential damages of any kind or n ature whatsoever arising out of or in any way relat ed to the furnishing, performance, or use of this t echnical data. zmd ag hereby expressly disclaims any liability of zmd ag to any customer, licensee or any other third party, and any such customer, licensee and any other thir d party hereby waives any liability of zmd ag for a ny damages in connection with or arising out of the furnishing, p erformance or use of this technical data, whether b ased on contract, warranty, tort (including neglige nce), strict liability, or otherwise .
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