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?I? ?I? ?I? ?I? 9 9 9 9 ? ? ? ? 7 7 7 7 ? ? ? ? 1 1 1 1 silicon touch technology inc . 9-7f-1, prosperity rd i, science-based industrial park hsinchu, taiwan, r.o.c. tel 886-3-5645656 fax 886-3-5645626 DD311 version : pre.001 issue date : 2004/12/7 file name : sp-DD311-pre.001.doc total pages : 15 high constant current led driver
c???? c???? c???? c???? silicon touch technology inc . ?W@^?I? 9 ? 7 ? 1 9-7f-1, prosperity road , hsin-chu, taiwan, r.o.c. tel 886-3-5645656 fax 886-3-5645626 high constant current led driver version:pre.001 page 1 DD311 DD311 high constant current led driver general description DD311 is a single-channel constant current led driver, which incorporates current mirror and current switch, designed to drive power leds. it can provide a maximum sink current of 1a, adjustable by reference current input. the output current is 100 times the input current value set by an external resistor or bias voltage. the maximum output voltage of 33v can provide more series power leds in a string. the output enable allows dimming control or switching power applications. features maximum output current: 1a (determined by input reference current) minimum output voltage: 1v (iout = 1a) maximum output voltage: 33v (output leakage current < 0.1ua) maximum output enable frequency: 1mhz excellent output current accuracy applications led architectural or entertainment lighting led general or specialty illumination led backlighting applications package types to-252
c???? c???? c???? c???? silicon touch technology inc . ?W@^?I? 9 ? 7 ? 1 9-7f-1, prosperity road , hsin-chu, taiwan, r.o.c. tel 886-3-5645656 fax 886-3-5645626 high constant current led driver version:pre.001 page 2 DD311 block diagram 1 : 100 en v led v bias i led i ref out rext gnd vss pin connection 1 2 vss rext out 3 4 gnd en 5 pin description pin no. pin name function 1 rext reference current input terminal. 2 out sink constant current outputs (open-drain). 3 gnd ground terminal. 4 vss ground terminal. 5 en output current enable terminal: v en = 0v , output current is turned off . v en > 3.3v , output current is turned on .
c???? c???? c???? c???? silicon touch technology inc . ?W@^?I? 9 ? 7 ? 1 9-7f-1, prosperity road , hsin-chu, taiwan, r.o.c. tel 886-3-5645656 fax 886-3-5645626 high constant current led driver version:pre.001 page 3 DD311 maximum ratings (ta=25 c, tj(max) = 125 c) characteristic symbol rating unit input reference current i ref 10 ma output current iout 1.0 a output voltage vout -0.3 ~ 33 enable voltage v en -0.3 ~ 18 v output enable frequency f en 1 mhz gnd terminal current i gnd 1.01 a power dissipation pd 4.2 (ta=25 c) w thermal resistance (junction to air) rth(j-a) 23.38 thermal resistance (junction to case) rth(j-c) 1.77 c/w operating temperature top -40 ~ 85 storage temperature tstg -55 ~ 150 c recommended operating condition characteristic symbol condition min. typ. max. unit force rext terminal directly ? ? 2.7 bias voltage vbias with an external resistor 5 ? 36 v output voltage vout driver on *1 1 ? ? output voltage vout driver off *2 ? ? 33 v output current iout ven > 3.3v ? ? 1 a v en(ih) 3.3 ? 18 input enable voltage v en(il) i ref = 1ma ~ 10ma -0.3 ? 0.0 v input enable frequency f en ven > 3.3v dc ? 1 mhz *1 notice that the power dissipation is limited to its package and ambient temperature. *2 the driver output voltage including any overshoot stress has to be compliant with the maximum voltage (33v).
c???? c???? c???? c???? silicon touch technology inc . ?W@^?I? 9 ? 7 ? 1 9-7f-1, prosperity road , hsin-chu, taiwan, r.o.c. tel 886-3-5645656 fax 886-3-5645626 high constant current led driver version:pre.001 page 4 DD311 electrical characteristics (ta = 25 c unless otherwise noted) characteristic symbol condition min. typ. max. unit input enable voltage ?h? level v en(ih) 3.3 ? 18 input enable voltage ?l? level v en(il) i ref = 1ma ~ 10ma -0.3 ? 0.0 v output leakage current i ol1 vout = 33 v ven = 0v ? ? 0.1 ua output current skew (chip-to-chip) *1 i ol2 ? tbd tbd % ambient temperature regulation 1 ? 0.01 ? % / c ambient temperature regulation 2 i ref = 1ma ~ 10ma vout = 1.0 v ? 0.05 ? ma / c output voltage regulation % / vout i ref = 1ma ~ 10ma vout = 1v ~ 3v ? 1.5 10 % / v switching characteristics (ta = 25 c unless otherwise noted) characteristic symbol condition min. typ. max. unit propagation delay (?l to ?h?) en-to-out (driver on) tplh ? 10 ? propagation delay (?h? to ?l?) en-to-out (driver off) tphl ? 50 ? output current rise time tor ? 25 ? output current fall time tof i ref = 10ma (iout = 1a) v en(ih) = 5v v en(il) = 0v vl = 12v rl = 10 ? cl = 13 pf ? 50 ? ns *1 chip-to-chip skew is defined as the range into which any output current of any ic falls.
c???? c???? c???? c???? silicon touch technology inc . ?W@^?I? 9 ? 7 ? 1 9-7f-1, prosperity road , hsin-chu, taiwan, r.o.c. tel 886-3-5645656 fax 886-3-5645626 high constant current led driver version:pre.001 page 5 DD311 out gnd vss rext i ref cl rl vl en c led optional c r optional switching characteristics test circuit transient characteristics in order to reduce the overshoot or undershoot(vout) during switching large current, it is recommended adding a large enough capacitor between v led and gnd to keep led supply voltage(v led ) stable. the longer rise time and fall time of the en dimming signal, adjustable by rc filter, produce the smooth transient response of output current. the two output waveforms illustrating the en dimming signal with and without rc filter are given below: without rc filter with rc filter
c???? c???? c???? c???? silicon touch technology inc . ?W@^?I? 9 ? 7 ? 1 9-7f-1, prosperity road , hsin-chu, taiwan, r.o.c. tel 886-3-5645656 fax 886-3-5645626 high constant current led driver version:pre.001 page 6 DD311 constant-current output constant-current value is set by the reference current input. the output current will be 100 times the input current value produced by an external resistor between the rext pin and the bias voltage or, alternatively, force the low bias voltage to rext pin. varying the resistor or the bias voltage value can adjust the current scale ranging up to 1a. notice that the output current is a little increasing or decreasing until the device temperature and ambient temperature are balance. the output current value is calculated roughly by the following equation : i led (a) 100 ( v bias v rext ) / r ext (ohm) = 100 i ref (a) 1 2 3 4 DD311 5 en r ext i led v led v bias i ref v rext output current as a function of rext value 0 100 200 300 400 500 600 700 800 900 1000 1100 100 1000 10000 100000 r ext (ohm) i led (ma) vbias=36v vbias=24v vbias=18v vbias=12v vbias=5v
c???? c???? c???? c???? silicon touch technology inc . ?W@^?I? 9 ? 7 ? 1 9-7f-1, prosperity road , hsin-chu, taiwan, r.o.c. tel 886-3-5645656 fax 886-3-5645626 high constant current led driver version:pre.001 page 7 DD311 1 2 3 4 DD311 5 en i led v led v bias output current as a function of vbias 0 100 200 300 400 500 600 700 800 900 1000 1100 1.8 1.9 2.0 2.1 2.2 2.3 2.4 2.5 2.6 2.7 2.8 v bias (volt) i led (ma) output current as a function of output voltage 0.0 0.2 0.4 0.6 0.8 1.0 1.2 0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 2.2 2.4 2.6 2.8 3.0 vout (volt) iout (a) v en = 5v vout = 1v iout = 1 a iout=750m iout=500m iout=350m iout=100m
c???? c???? c???? c???? silicon touch technology inc . ?W@^?I? 9 ? 7 ? 1 9-7f-1, prosperity road , hsin-chu, taiwan, r.o.c. tel 886-3-5645656 fax 886-3-5645626 high constant current led driver version:pre.001 page 8 DD311 ambient temperature vs. output current 0 100 200 300 400 500 600 700 800 900 1000 1100 -60 -40 -20 0 20 40 60 80 100 120 140 ambient temperature (c) iout (ma) 1003.5 1004.0 1004.5 1005.0 1005.5 1006.0 1006.5 1007.0 -60 -40 -20 0 20 40 60 80 100 120 140 ambient temperature (c) iout (ma) 755 756 757 758 759 760 761 762 -60 -40 -20 0 20 40 60 80 100 120 140 ambient temperature (c) iout (ma) 497 498 499 500 501 502 503 504 505 -60 -40 -20 0 20 40 60 80 100 120 140 ambient temperature (c) iout (ma) 351 352 353 354 355 356 357 -60 -40 -20 0 20 40 60 80 100 120 140 ambient temperature (c) iout (ma) 99.8 100.0 100.2 100.4 100.6 100.8 101.0 101.2 101.4 101.6 101.8 102.0 -60 -40 -20 0 20 40 60 80 100 120 140 ambient temperature (c) iout (ma) iout=1 a iout=750ma iout=500m a iout=350m a iout=100m a vout = 1v v en = 12v vout = 1v v en = 12v vout = 1v v en = 12v vout = 1v v en = 12v vout = 1v v en = 12v vout = 1v, v en = 12 v
c???? c???? c???? c???? silicon touch technology inc . ?W@^?I? 9 ? 7 ? 1 9-7f-1, prosperity road , hsin-chu, taiwan, r.o.c. tel 886-3-5645656 fax 886-3-5645626 high constant current led driver version:pre.001 page 9 DD311 enable voltage vs. output current 0 100 200 300 400 500 600 700 800 900 1000 1100 0 2 4 6 8 10 12 14 16 18 20 v en (volt) iout (ma) 970 980 990 1000 1010 1020 02468101214161820 v en (volt) iout (ma) 750 752 754 756 758 760 762 764 02468101214161820 v en (volt) iout (ma) 505 506 507 508 509 0 2 4 6 8 10 12 14 16 18 20 v en (volt) iout (ma) 351.5 352.0 352.5 353.0 353.5 0 2 4 6 8 10 12 14 16 18 20 v en (volt) iout (ma) 100.60 100.65 100.70 100.75 100.80 02468101214161820 v en (volt) iout (ma) iout=1 a iout=750ma iout=500m a iout=350m a iout=100m a vout = 1v ta = 25 c vout = 1v ta = 25 c vout = 1v ta = 25 c vout = 1v ta = 25 c vout = 1v ta = 25 c vout = 1v , ta = 2 5 c
c???? c???? c???? c???? silicon touch technology inc . ?W@^?I? 9 ? 7 ? 1 9-7f-1, prosperity road , hsin-chu, taiwan, r.o.c. tel 886-3-5645656 fax 886-3-5645626 high constant current led driver version:pre.001 page 10 DD311 power dissipation notice that the power dissipation of a semiconductor chip is limited to its package and ambient temperature, in which the device requires the maximum output current calculated for given operating conditions. the maximum allowable power consumption can be calculated by the following equation: pd(max)(watt) = tj(junction temperature)(max)( c) C C C C ta(ambient temperature)( c) rth(junction-to-air thermal resistance)( c/watt) the relationship between power dissipation and operating temperature can be refer to the figure below: 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 0 20 40 60 80 100 120 140 ambient temperature ta(c) power dissipation pd(w) based on the pd(max), the maximum allowable voltage of output terminal can be calculated as follows: vout(max)(volt) = pd(max)(watt) C C C C v rext (volt) i ref (a) iout(a) dimming duty tj(max)=125 c rth=23.38 c/watt
c???? c???? c???? c???? silicon touch technology inc . ?W@^?I? 9 ? 7 ? 1 9-7f-1, prosperity road , hsin-chu, taiwan, r.o.c. tel 886-3-5645656 fax 886-3-5645626 high constant current led driver version:pre.001 page 11 DD311 typical application 1 2 3 4 DD311 5 en r ext i led v led series string (suggested) 1 2 3 4 DD311 5 en r ext i led = i 1 + i 2 + + i n v led paralleled strings optional i 1 i 2 i n cross connected paralleled strings 1 2 3 4 DD311 5 en optional r ext v led optional i 1 i 2 i n i led = i 1 + i 2 + + i n
c???? c???? c???? c???? silicon touch technology inc . ?W@^?I? 9 ? 7 ? 1 9-7f-1, prosperity road , hsin-chu, taiwan, r.o.c. tel 886-3-5645656 fax 886-3-5645626 high constant current led driver version:pre.001 page 12 DD311 typical application 1 2 3 4 DD311 5 r ext i led v led gnd vcc 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 dm413 vcc 1 2 3 4 DD311 5 r ext i led vcc 1 2 3 4 DD311 5 r ext i led vcc pull-high resistance DD311 is specifically designed to withstand high frequency switching signal (1mhz max) while providing high current driving capability. by connecting enable pin to a pwm signal output, system will adapt to precise dimming control. in this display of a typical application, a pwm enabled rgb driver dm413 is configured to act as pwm signal generator. through serial data input, dm413 can generate maximum of 14 bits rgb pwm grayscale signal to control a set of three DD311. the combination of DD311 and dm413 offers an ideal solution for high end grayscale control and color manipulation.
c???? c???? c???? c???? silicon touch technology inc . ?W@^?I? 9 ? 7 ? 1 9-7f-1, prosperity road , hsin-chu, taiwan, r.o.c. tel 886-3-5645656 fax 886-3-5645626 high constant current led driver version:pre.001 page 13 DD311 package outline dimension to-252 unit: inch
c???? c???? c???? c???? silicon touch technology inc . ?W@^?I? 9 ? 7 ? 1 9-7f-1, prosperity road , hsin-chu, taiwan, r.o.c. tel 886-3-5645656 fax 886-3-5645626 high constant current led driver version:pre.001 page 14 DD311 the products listed herein are designed for ordinary electronic applications, such as electrical appliances, audio-visual equipment, communications devices and so on. hence, it is advisable that the devices should not be used in medical instruments, surgical implants, aerospace machinery, nuclear power control systems, disaster/crime- p revention equipment and the like. misusing those products may directly or indirectly endanger human life, or cause injury and property loss. silicon touch technology, inc. will not take any responsibilities regarding the misusage of the products mentioned above. anyone who purchases any products described herein with the above-mentioned intention or with such misused applications should accept full responsibility and indemnify. silicon touch technology, inc. and its distributors and all their officers and employees shall defend jointly and severally against any and all claims and litigation and all damages, cost and expenses associated with such intention and manipulation.

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