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? semiconductor components industries, llc, 2010 january, 2010 ? rev. 1 1 publication order number: NCV7680/d NCV7680 linear current regulator and controller for automotive led rear combination lamps the NCV7680 consists of eight linear programmable constant current sources. the part is designed for use in the regulation and control of led based rear combination lamps for automotive applications. system design with the NCV7680 allows for two brightness levels, one for stop and one for tail illumination, or optional pwm control can also be implemented. discrete led brightness levels are easily programmed (stop current value, tail duty cycle value) optional external ballast fet allows for power distribution on designs requiring high currents. set back power limit reduces the drive current during overvoltage conditions. this is most useful for low current applications when no external fet is used. features ? constant current outputs for led string drive ? led drive current up to 75 ma per channel ? open led string diagnostic with open ? drain output ? slew rate control eliminates emi concerns ? low dropout operation for pre ? regulator applications ? external modulation capable ? on ? chip 1 khz tail pwm dimming ? single resistor for stop current set point ? single resistor for tail dimming set point ? overvoltage set back power limitation ? aec q100 qualified ? 16 lead soicw exposed pad ? this is a pb ? free device applications ? rear combination lamps (rcl) ? daytime running lights (drl) ? fog lights ? center high mounted stop lamps ( chmsl) arrays ? turn signal and other externally modulated applications ? lcd back lighting marking diagram a = assembly location wl = wafer lot yy = year ww = work week g = pb ? free device soic ? 16 wb pw suffix case 751ag http://onsemi.com device package shipping ? ordering information NCV7680pwr2g soic ? 16wb (pb ? free) 1000 / tape & reel v7680 awlyywwg ?for information on tape and reel specifications, including part orientation and tape sizes, please refer to our t ape and reel packaging specifications brochure, brd8011/d.
NCV7680 http://onsemi.com 2 figure 1. simple block diagram out1 out8 out7 out6 out5 out4 out3 out2 + - vp ballast drive fb stop diag gnd rstop rtail fet drive 1.05 v output control ballast drive regulation control diagnostic reporting (high reporting) open circuit rstop current limit overvoltage set back current (down 20%) output current current programming
NCV7680 http://onsemi.com 3 figure 2. detailed block diagram channel control output disable open circuit detect oscillator and pwm i rstop x 100 diag interface overtemperature & overvoltage sense out1 vp ballast drive fb stop diag gnd rstop rtail out2 out3 out4 out5 out6 out7 out8 control logic v ? i converter pin current limit 4.4 v 0.4 v fet drive 5v 100k 1.05 v 5v 200k soft start, bias, and reference overvoltage 1 of 8 + ? + ? 400 mv 100 mv setback current ? 20% vreg irstop rtail + ? + ? + ? ep figure 3. pinout diagram out1 out2 out3 out4 out5 out6 out7 out8 vp gnd rtail rstop diag stop/pwm fb ballast drive
NCV7680 http://onsemi.com 4 out1 NCV7680 out2 out3 out4 out5 out6 out7 out8 vp gnd rtail rstop diag stop/pwm fb ballast drive c3 100nf mra4003t3g mra4003t3g r3 1k r1 10k c4 10nf r5, 2.21k r4, 3.09k r6 8.87k r7 1k r1 limits the current out of stop/pwm during reverse battery condition. r6 and r7 values shown yield 10.5 v regulation on v string . c1 is for line noise considerations. c3 is for ems considerations. figure 4. application diagram with external fet ballast transistor c2 0.22 f c1 0.1 f epad tail input stop input v string v ref ntd2955 figure 5. application diagram without the fet ballast transistor out1 NCV7680 out2 out3 out4 out5 out6 out7 out8 vp gnd rtail rstop diag stop/pwm fb ballast drive c3 100nf mra4003t3g mra4003t3g r1 10k c4 10nf r5, 2.21k r4, 3.09k r8 10k tail input stop input epad when using the NCV7680 without the fet ballast transistor, tie the fb pin to vp through a 10k resistor.
NCV7680 http://onsemi.com 5 table 1. application i/o truth table (fb = v ref ) (reference figure 2) stop input tail input outx current (1 ? 8) fault state* diag state 0 0 off ? highz** 1 0 i stop normal low 1 0 i stop open circuit*** high** 0 1 pwm do not care high** 1 1 i stop normal low 1 1 i stop open circuit*** high** * open circuit, r stop current limit, and set back current limit down 20% ** pullup resistor to diag *** open circuit = any string open 0 = low 1 = high tail stop diag open string occurs open string occurs open string removed figure 6. diag timing diagram highz
NCV7680 http://onsemi.com 6 table 2. pin function description (16 pin so wide exposed pad package) pin # label description 1 out1 channel 1 constant current output to led. unused pin should be grounded. 2 vp supply voltage input. 3 ballast drive gate drive for external power distribution pfet. ground if not used. 4 fb feedback sense node for v p regulation. use feedback resistor divider or connect to v p with a 10k resistor. 5 stop/pwm stop logic input. external modulation input. 6 diag open ? drain diagnostic output. reporting open circuit, r stop current limit, and overvoltage set back current down 20%. normal operation = low. ground if not used. 7 rstop stop current bias program resistor. 8 rtail tail current duty cycle pwm program resistor. ground if using external modulation. 9 out8 channel 8 constant current output to led. unused pin should be grounded. 10 out7 channel 7 constant current output to led. unused pin should be grounded. 11 out6 channel 6 constant current output to led. unused pin should be grounded. 12 out5 channel 5 constant current output to led. unused pin should be grounded. 13 gnd ground. 14 out4 channel 4 constant current output to led. unused pin should be grounded. 15 out3 channel 3 constant current output to led. unused pin should be grounded. 16 out2 channel 2 constant current output to led. unused pin should be grounded. epad* epad ground. do not connect to pcb traces other than gnd. *grounding will provide better thermal and electrical performance. maximum ratings (voltages are with respect to device substrate) rating value unit vp, ballast drive, stop, diag dc peak transient ? 0.3 to 45 45 v output pin voltage (outx) ? 0.3 to 45 v output pin current (outx) 100 ma input voltage (rtail, rstop, fb) ? 0.3 to 5 v junction temperature, t j ? 40 to 150 c peak reflow soldering temperature: pb ? free 60 to 150 seconds at 217 c (note 1) 260 peak c stresses exceeding maximum ratings may damage the device. maximum ratings are stress ratings only. functional operation above t he recommended operating conditions is not implied. extended exposure to stresses above the recommended operating conditions may af fect device reliability. 1. for additional information, see or download on semiconductor?s soldering and mounting techniques reference manual, solderrm/d , and application note and8003/d.
NCV7680 http://onsemi.com 7 table 3. attributes characteristics value esd capability human body model (rstop pin) human body model (all remaining pins) machine model > 1.8 kv > 2.0 kv > 200 v moisture sensitivity level (note 2) msl 1 storage temperature ? 55 c to 150 c package thermal resistance (note 3) junction ? to ? board (r jb ) junction ? to ? ambient (r ja ) junction ? to ? pin (r jl ) 27 c/w 78 c/w 38 c/w meets or exceeds jedec spec eia/jesd78 ic latchup test 2. for additional information, see or download on semiconductor?s soldering and mounting tech- niques reference manual, solderrm/d, and application note and8003/d. 3. values represent typical still air steady ? state thermal performance on 1 oz. copper fr4 pcb with 650 mm 2 copper area. electrical characteristics (6 v < v p < 16 v, v stop = v p , r stop = 3.09 k , r tail = 2.21 k , ? 40 c t j 150 c, unless otherwise specified) (note 4) characteristic conditions min typ max unit general parameters quiescent current (i outx = 35 ma) stop mode, 8 channel stop mode, 4 channel tail mode v p = 16 v v p = 16 v, out5 = out6 = out7 = out8 = gnd v p = 16 v ? ? ? 6.5 6.4 6.0 8.0 8.0 8.0 ma ground pin current out1 to out8 = 35 ma ? 300 350 ma current source outputs output current outx = 1.0 v, t j = 25 c, 150 c outx = 1.0 v, t j = ? 40 c 31.5 30.8 35 35 38.5 39.2 ma maximum regulated output current 75 ? ? ma current matching ? 40 c 25 c 150 c 2i outx(min) i outx(min) i outx(max) 1 100 2i outx(max) i outx(min) i outx(max) 1 100 ? 7 ? 6 ? 5 0 0 0 7 6 5 % % % line regulation 6 v v p 16 v ? 0.6 3.0 ma open circuit detection threshold 0.3 0.4 0.5 v current slew rate i out = 35 ma, 10% to 90% points ? 6.0 25 ma/us overvoltage set back threshold @ 99% i out 16.0 18.7 24.5 v overvoltage set back current v p = 20 v ? 94 ? %i out diag reporting of set back current ? 80 ? %i out output disable threshold ? 100 250 mv fet driver ballast drive leakage current sink current fb = 1.5 v, ballast drive = 3 v fb = 0.5 v, ballast drive = 3 v ? 4 0 5 10 ? a ma ballast drive reference voltage 0.95 1.05 1.15 v 4. designed to meet these characteristics over the stated voltage and temperature recommended operating ranges, though may not be 100% parametrically tested in production. 5. guaranteed by design.
NCV7680 http://onsemi.com 8 electrical characteristics (6 v < v p < 16 v, v stop = v p , r stop = 3.09 k , r tail = 2.21 k , ? 40 c t j 150 c, unless otherwise specified) (note 4) characteristic unit max typ min conditions stop logic input high threshold 1.6 1.9 2.2 v input low threshold 0.7 0.85 1.1 v v in hysteresis ? 1.05 ? v input bias current stop = 14 v 0 150 300 a programming r stop bias voltage stop current programming voltage 0.96 1.08 1.21 v r stop k multiplier i outx / i rstop ? 100 ? ? r stop current limit ? 1.8 2.2 ma r tail bias current tail duty cycle programming current 300 350 450 a duty cycle r tail = 0.59 v r tail = 1.21 v r tail = 3.29 v 3.5 17 59.5 5.0 20 70 6.5 23 80.5 % % % diag output output low voltage diag active, i diag =1 ma ? 0.1 0.40 v output leakage current v diag = 5 v ? ? 10 a thermal limit thermal limit temperature outx reduction initiated @ 99% i out (note 5) 150 ? ? c thermal shutdown (note 5) 150 190 ? c thermal hysteresis (note 5) ? 15 ? c 4. designed to meet these characteristics over the stated voltage and temperature recommended operating ranges, though may not be 100% parametrically tested in production. 5. guaranteed by design. ac characteristics (6 v < v p < 16 v, v stop = v p , r stop = 3.09 k , r tail = 2.21 k , ? 40 c t j 150 c, unless otherwise specified) characteristic conditions min typ max unit stop turn ? on delay time v stop/pwm 90% to i outx 90% ? 14 45 s stop turn ? off delay time v stop/pwm 10% to i outx 10% ? 21 45 s pwm frequency stop = 0 v 0.5 1.0 2.1 khz tail frequency stabilization time v p step from 0 v to 6 v ? 2.0 4.0 ms open circuit to diag reporting ? 4.0 10 s
NCV7680 http://onsemi.com 9 typical performance characteristics ja maximum ( c/w) copper heat spreader area ( 2 mm) figure 7. ja vs. copper spreader area 0.1 1 10 100 1000 0.000001 0.00001 0.0001 0.001 0.01 0.1 1 10 100 1000 r (t) maximum ( c/w) pulse time (s) figure 8. thermal duty cycle curves on 650 mm 2 spreader test board d = 0.5 0.2 0.1 single pulse 0.05 0.02 0.01 figure 9. single pulse heating curve pulse time (s) r (t) maximum ( c/w) 0.1 1 10 100 1000 0.000001 0.00001 0.0001 0.001 0.01 0.1 1 10 100 1000 50 mm 2 100 mm 2 500 mm 2 0 20 40 60 80 100 120 140 160 0 100 200 300 400 500 600 700 1 oz 2 oz
NCV7680 http://onsemi.com 10 figure 10. i out vs. r stop r stop (k ) r tail (k ) 4.0 5.0 3.0 2.0 1.5 1.0 0.5 0 0 10 20 30 50 60 70 6 4 3 2 1 0 0 10 20 30 40 50 60 70 i out , output current (ma) duty cycle (%) 2.5 3.5 4.5 40 t = 25 c 5 figure 11. i out vs. temperature temperature ( c) 120 160 80 40 20 0 ? 20 ? 40 33 33.5 34 34.5 35.5 36 i out , output current (ma) 60 100 140 35 figure 12. duty cycle vs. r tail r stop = 3.09 k 25 30 35 duty cycle (%) figure 13. duty cycle vs. v(r tail ) temperature ( c) 120 160 80 40 60 100 140 r tail = 4 k r tail = 3 k r tail = 2 k figure 14. duty cycle vs. temperature figure 15. i out vs. vp vp (v) 21 17 15 11 927 25 23 0 5 10 15 20 25 30 35 i out , output current (ma) 13 19 40 10 8 79 0 ? 40 ? 20 20 10 15 20 0 5 r stop = 3.09 k r stop = 3.09 k v(r tail ) 3 2 1.5 1 0.5 0 0 10 20 30 40 50 60 70 duty cycle (%) 2.5 3.5
NCV7680 http://onsemi.com 11 i rstop (ma) 2.5 2.0 1.5 1.0 0.5 0 0 20 40 60 80 100 120 i out (ma) outx current is limited during short circuit events of r stop . the current rolls off per the diagram to prevent unexpected excessive power dissipation. r6 ( ) 12000 8000 6000 4000 2000 0 0 2 4 6 8 10 12 14 v string (v) 10000 per eq. 1 r7 = 1k figure 16. vp line regulation figure 17. v string vs. r6 figure 18. i out vs. i rstop vp 15 13 12 10 9 8 7 6 34 34.2 34.4 34.6 34.8 35 35.2 35.4 i outx , output current (ma) 11 14 16 outx = 1 v 35.6 35.8 36
NCV7680 http://onsemi.com 12 detailed operating description general the NCV7680 consists of eight linear programmable constant current sources. the part is designed for use in the regulation and control of led based rear combination lamps for automotive applications. system design with the NCV7680 allows for two brightness levels; one for stop, and one for tail illumination. brightness levels are easily programmed (stop current absolute value, tail current duty cycle value) with two external resistors. the use of an external fet allows for power distribution on designs requiring high currents. additionally, set back power limit reduces the drive current during overvoltage conditions. set back power limit is most useful for low current applications when no external fet is used. the NCV7680 offers all of the built in protection normal to regulator systems, such as current limit, thermal limit, and provides an open load diagnostic that coincides with the stop input signal. open string reporting (diag) open string detection is reported on the diag pin as a high with stop input high, or a combination of stop input high and tail input high. reference table 1 on page 5 for more details. open circuit is sensed on each of the 8 outputs. the typical threshold voltage for detection is 0.4 v. care must be taken not to breach this voltage level under normal operation , or a false open will be reported. make sure worst case system design focuses on the voltage level on top of the led string (top anode) (v string ) and includes the worst case led voltage drop while considering temperature effects. input voltage and set back current automotive battery systems have wide variations in line supply voltage. low dropout is a key attribute for providing consistent led light output at low line voltage. unlike adjustable regulator based constant current source schemes where the set point resistor resides in the load path, the NCV7680?s set point resistor lies outside the led load path, and aids in the low dropout capability. setback current limit is employed during high voltage. during a setback current limit event, the drive current is reduced resulting in lower power dissipation on the ic. this occurs during high battery voltage (v p > 16 v). in this way the NCV7680 can operate in extreme conditions and still provide a controlled level of light output the overvoltage condition is reported on the diag pin. reference figures 19 and 20 for power limiting behavior. voltage low drop ? out area constant current area overvoltage set back area only voltage effects thermal shutdown figure 19. ballast fet power driver power dissipation 180 c (typ) voltage low drop ? out area constant current area overvoltage set back area only voltage effects thermal shutdown figure 20. ic power ic power dissipation 180 c (typ) quiescent current power further reduction in power to the NCV7680 can be achieved by moving the v p pin connection to the drain of the external fet. the contribution of power at the NCV7680 caused by the quiescent current into v p is lowered due to the lower operating voltage of v p with the new connection. note also the addition of an external resistor rsd in figure 21. this will be required to insure startup of the system. a value for rsd should be chosen low enough to provide current into v p and the current in the i leds & feedback string under all required input voltage input conditions.
NCV7680 http://onsemi.com 13 figure 21. alternative v p connection with rsd out1 NCV7680 out2 out3 out4 out5 out6 out7 out8 v p gnd r tail r stop diag stop fb ballast drive i leds & feedback r3 1k c3 100 nf c2 0.22 f c1 0.1 f v bat mra4003t3g rsd ntd2955 programmability strings of leds are a common configuration for rcl applications. the NCV7680 provides eight matched outputs allowing individual string drive with current set by a single resistor. individual string drive is a benefit to ensure equal current distribution amongst all of the strings. output currents are mirrored and matched within 5% at hot temperature. a high stop condition sets the output current using equation 1 below. a low stop condition, modulates the output currents at a duty cycle (dc) programmed using equation 2 below. note, current limiting on r stop limits the current which can be referenced from the rstop pin. exceeding the r stop current limit will reduce the output current and the diag pin will go high (reference figure 18). this helps limit output current (brightness and power) for this type of fault. the average i stop duty cycle current provides the dimmed tail illumination function and assures a fixed brightness level for tail. the pwm generator?s fixed frequency (1 khz typ.) oscillator allows flicker ? free illumination. pwm control is the preferred method for dimming leds. the diagnostic function allows the detection of an open in any one of the output circuits. the active ? low diagnostic output (diag) is coincident with the stop input. diag remains high (pulled up) if an open load is detected in any led string when stop is high. output current programming reference figure 10 to choose programming resistor (r stop ) value for stop current. reference figure 12 (duty cycle vs. r tail ) to choose a typical value programming resistor for output duty cycle (with a typical r stop value of 3.09 k ). note the duty cycle is dependent on both r stop and r tail values. r stop should always be chosen first as the stop current is only dependent on this value. alternatively, the equations below can be used to calculate a typical value and used for worst case analysis. set the stop current using r stop outx 100 r stop_bias_voltage r stop r stop bias voltage = 1.08 v (typ) (eq. 1) set the duty cycle (dc) using r tail r tail 4 r stop (dc 0.1) dc = duty cycle expressed in fractional form. (e.g. 0.50 is equivalent to 50% duty cycle) (eq. 2) (ground r tail when using external modulation) output current is directly tested per the electrical parameter table to be 10% (with r stop = 3.09 k ) or 31.5 ma (min), 35 ma (typ), 38.5 ma (max) at room and hot temperature. duty cycle will vary according to the changes in r tail voltage and r tail bias current (generated form the current through r stop ). voltage errors encompass generator errors (0.4 v to 4.4 v) and comparator errors and are included in testing as the duty cycle. t ypical duty cycle measurements are 5% with r tail = 0.59 v and 70% with r tail = 3.29 v. r tail bias current errors are measured as r tail bias current and vary as 300 a (min), 350 a (typ), and 450 a (max) with r stop = 3.09 k . the error duality and choice of duty cycle levels make it difficult to specify duty cycle minimum and maximum limits, but worst case conditions can be calculated when considering the variation in the voltage threshold and current source. duty cycle variation must include the direct
NCV7680 http://onsemi.com 14 duty cycle as specified in the electrical parameter table plus an additional error due to the irstop current which generates this voltage in the system. + ? 4.4v 0.4v oscillator and pwm figure 22. duty cycle generator circuitry r tail r tail v reg i rstop alternative setup of duty cycle alternatively, the duty cycle can be controlled by providing a voltage to the r tail pin as per figure 13 (duty cycle vs. v(r tail ). note the pull-up current source (i rstop ) is still present on the r tail pin due to current setting resistor connected to r stop . for proper operation the system designer needs to insure there is sufficient loading on the r tail pin such that i rstop does not pull the referenced voltage higher than its regulated state. setting v string v string should be set to a level to allow proper operation of the ic without detecting an open circuit (0.5 v max on outx) and to keep power to the ic at reduced levels below the 150 c max die temperature thermal limit (die temperature will depend on printed circuit board composition, pcb size, thermal via number and placement, module component placement, and air flow). example: v string is set using resistors r6 and r7 (reference figure 4). v string v fb
r6 r7 1 (eq. 3) v fb = ballast drive reference voltage this simplifies to an equation for r6. r6 r7
v string v fb v fb (eq. 4) calculate system design v string . let v led be the voltage drop across your leds (3 included in figure 4). 9.5 v choose a value for outx, 1 v v string v outx v led (eq. 5) using equation 3 v string 1v 9.5 v 10.5 v using equation 4 choose a value for r7. r7 = 1k r6 1k
10.5 v 1.08 v 1.08 v 8.72k the closest standard resistor value is 8.87k. reduced channel operation the previously shown applications (figures 4 and 5) show system operation using all 8 available channels of the NCV7680. when less than 8 channels are used, the unused outx pins can be grounded eliminating the unused outx drive current. this is accomplished by voltage threshold detection on outx (100 mv typ). a voltage less than 100 mv on outx turns the driver off, reducing quiescent current to the ic. this also helps reduce system power by eliminating the need for an external pullup resistor (from outx to v p ) while maintaining open circuit detection. external pullup resistors may be used as an alternative. adding led?s to the string the NCV7680 can function as a standalone device or in conjunction with additional support circuitry for more complex systems. figure 23 shows the NCV7680 operating with a boost controller. this setup allows additional leds in a string to be increased. eight are shown in the diagram. consideration of the 45 v maximum limit on the outx pin is the limitation of this configuration. the dc on voltage level on outx must also be considered for thermal reasons. electromagnetic interference (emi) one of the key contributors to electromagnetic interference is the rise and fall times of the electrical signals. this is a concern with both the initial startup of a device, and the repeated turn on/off cycles of a device. the NCV7680 employs current slew rate control. each output is rated at 6.0 ma/ s (typ). slew rate control reduces overshoot and allows for a predictable electrical signal. slew rate control is used in the stop mode for soft ? start and in the tail mode for low emi operation.
NCV7680 http://onsemi.com 15 figure 23. boost mode out1 NCV7680 out2 out3 out4 out5 out6 out7 out8 vp gnd rtail rstop diag stop/pwm fb ballast drive mra4003t3g mra4003t3g r1 10k c4 10nf r5, 2.21k r4, 3.09k tail input stop input r8, 10k ? + + ? c3 1 f ncv3163 boost controller epad
NCV7680 http://onsemi.com 16 figure 24. cross coupled leds out1 NCV7680 out2 out3 out4 out5 out6 out7 out8 vp gnd rtail rstop diag stop fb ballast drive v string epad cross-coupled leds the setup in figure 24 shows the leds set up in a cross-coupled configuration connected to all the outputs of the NCV7680 in parallel. this allows the user to maintain illumination of all the remaining leds when one fails due to an open circuit (the most common form of led failure). comparatively, the standard setup shown in figure 4 will result in a full string turning off when one led is open. be aware as leds fail as open circuits in the cross-coupled arrangement will cause the row of leds to run at a higher current level affected by the smaller number of leds in that row.
NCV7680 http://onsemi.com 17 figure 25. no tail light, stop illuminated out1 NCV7680 out2 out3 out4 out5 out6 out7 out8 vp gnd rtail rstop diag stop/pwm fb ballast drive c3 100nf mra4003t3g mra4003t3g r3 1k r1 10k c4 10nf r5, 2.21k r4, 3.09k r6 8.87k r7 1k tail input stop input led module + ? c2 0.22 f c1 0.1 f epad v string v ref ntd2955 figure 26. tail light illuminated, no stop out1 NCV7680 out2 out3 out4 out5 out6 out7 out8 vp gnd rtail rstop diag stop/pwm fb ballast drive c3 100nf mra4003t3g mra4003t3g r3 1k r1 10k c4 10nf r5, 2.21k r4, 3.09k r6 8.87k r7 1k tail input stop input led module + ? c2 0.22 f c1 0.1 f epad v string v ref ntd2955
NCV7680 http://onsemi.com 18 figure 27. pwm operation (suggested lcd backlighting applications) out1 NCV7680 out2 out3 out4 out5 out6 out7 out8 vp gnd rtail rstop diag stop/pwm fb ballast drive mra4003t3g r1 10k c4* 10nf r4, 3.09k vbat or boost voltage pwm c5 1 f c3 1 f epad 6v * optional for emi considerations external pwm operation using the NCV7680 in a pwm setup requires r tail to be grounded. grounding r tail disables the internal pwm circuitry. w ith r tail grounded, the stop input pin can then be modulated externally with a microprocessor using the stop logic input level thresholds. tail frequency stabilization time requires 2 pulses from the internal oscillator. this is typically 2 ms (from the 1 khz oscillator. circuit limitations dictate the maximum output current (i outx ) to be 60 ma when operated at v p = 5 v. part capability increases up to the part maximum capability as v p is increased.
NCV7680 http://onsemi.com 19 latch ? off on open string detection some led lighting systems require the complete lighting system to shut down when the output intensity has diminished. this eliminates a slow degradation of output illumination. figure 28 provides one solution for this requirement. the open circuit fault information provided on the diag pin coupled with external discrete transistors provides the feedback needed to the fb pin to turn off the ballast transistor drive removing the led anode string from any power source. this condition is held until the input signal is toggled. figure 28. latch ? off circuit c3 100nf c1 0.1uf ntd2955 r3 1k r6 8.87k r7 1k c2 0.22uf tail input stop input r1 10k c4 10nf r5, 2.21k r4, 3.09k r2 4.99k r9 499 r10 10k r11 10k c6 0.1uf out1 NCV7680 out2 out3 out4 out5 out6 out7 out8 vp gnd rtail rstop diag stop fb ballast drive mra4003t3g mra4003t3g mra4003t3g mun2211 v string v ref note: latch ? off will be implemented under all conditions which cause diag to go high. reference the pin function description table for a summary of diag performance.
NCV7680 http://onsemi.com 20 package dimensions soic 16 lead wide body, exposed pad case 751ag ? 01 issue a g ? w ? ? u ? p m 0.25 (0.010) w ? t ? seating plane k d 16 pl c m 0.25 (0.010) t uw s s m f detail e detail e r x 45 notes: 1. dimensioning and tolerancing per ansi y14.5m, 1982. 2. controlling dimension: millimeter. 3. dimension a and b do not include mold protrusion. 4. maximum mold protrusion 0.15 (0.006) per side. 5. dimension d does not include dambar protrusion. allowable protrusion shall be 0.13 (0.005) total in excess of the d dimension at maximum material condition. 6. 751r-01 obsolete, new standard 751r-02. j m 14 pl pin 1 i.d. 8 1 16 9 top side 0.10 (0.004) t 16 exposed pad 18 back side l h dim a min max min max inches 10.15 10.45 0.400 0.411 millimeters b 7.40 7.60 0.292 0.299 c 2.35 2.65 0.093 0.104 d 0.35 0.49 0.014 0.019 f 0.50 0.90 0.020 0.035 g 1.27 bsc 0.050 bsc h 3.45 3.66 0.136 0.144 j 0.25 0.32 0.010 0.012 k 0.00 0.10 0.000 0.004 l 4.72 4.93 0.186 0.194 m 0 7 0 7 p 10.05 10.55 0.395 0.415 r 0.25 0.75 0.010 0.029 a b 9 *for additional information on our pb ? free strategy and soldering details, please download the on semiconductor soldering and mounting techniques reference manual, solderrm/d. soldering footprint* 0.350 0.175 0.050 0.376 0.188 0.200 0.074 dimensions: inches 0.024 0.150 exposed pad c l c l on semiconductor and are registered trademarks of semiconductor components industries, llc (scillc). scillc reserves the right to mak e changes without further notice to any products herein. scillc makes no warranty, representation or guarantee regarding the suitability of its products for an y particular purpose, nor does scillc assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including wi thout limitation special, consequential or incidental damages. ?typical? parameters which may be provided in scillc data sheets and/or specifications can and do vary in different application s and actual performance may vary over time. all operating parameters, including ?typicals? must be validated for each customer application by customer?s technical experts. scillc does not convey any license under its patent rights nor the rights of others. scillc products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other applications intended to support or sustain life, or for any other application in which the failure of the scillc product could create a sit uation where personal injury or death may occur. should buyer purchase or use scillc products for any such unintended or unauthorized application, buyer shall indemnify and hold scillc and its of ficers, employees, subsidiaries, af filiates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, direct ly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that scillc was negligent regarding the design or manufacture of the part. scillc is an equal opportunity/affirmative action employer. this literature is subject to all applicable copyright laws and is not for resale in any manner. publication ordering information n. american technical support : 800 ? 282 ? 9855 toll free usa/canada europe, middle east and africa technical support: phone: 421 33 790 2910 japan customer focus center phone: 81 ? 3 ? 5773 ? 3850 NCV7680/d literature fulfillment : literature distribution center for on semiconductor p.o. box 5163, denver, colorado 80217 usa phone : 303 ? 675 ? 2175 or 800 ? 344 ? 3860 toll free usa/canada fax : 303 ? 675 ? 2176 or 800 ? 344 ? 3867 toll free usa/canada email : orderlit@onsemi.com on semiconductor website : www.onsemi.com order literature : http://www.onsemi.com/orderlit for additional information, please contact your local sales representative

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