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data sheet rev. 1.1 / august 2010 ZLED7001 universal led driver with temperature compensation
ZLED7001 universal led driver with temperature compensation ? 2010 zentrum mikroelektronik dresden ag ? rev. 1.1 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 subject to changes without notice. brief description the ZLED7001, one of our zled family of led control ics, is a peak current-mode control led driver ic that is optimal for buck led driver applications. the ZLED7001 operates in constant off-time mode. capable of operating efficiently with voltage sources ranging from 8 vdc to 450 vdc or rectified 110 vac/ 220 vac, it is ideal for high brightness (hb) led applications. the ZLED7001 provides a pwm input for an external dimming control signal. the ZLED7001?s linear dimming input can be used both for linear dimming (0 to 240 mv) and temperature compensation of the led current. because the ZLED7001?s response time is limited only by the rate of change in the inductor current, it attains a high performance pulse-width modulation (pwm) dim- ming response. the ZLED7001 ensures proper output current regulation, without loop compensation, via peak current-mode operation. ZLED7001 application circuit v ref ld pwmd cs gate ZLED7001 v s nled l1 r2 ntc c in c1 r1 8 to 450 vdc 8 5 6 2 3 1 gnd 4 t off 7 v in d1 c off r cs c led r in q1 ZLED7001 features ? wide input range from 8 vdc to 450 vdc or 110 vac/220 vac ? temperature compensation to protect the leds and extend led lifetime ? operates in constant off-time mode ? both pwm and linear dimming control signal inputs available ? very few external components needed for operation ? broad range of applications: outputs greater than 1a application examples ? line-powered replacement led lighting ? illuminated led signs and other displays ? led street and traffic lighting ? constant-current source for general purposes ? architecture / building led lighting ? led backlighting ? line powered led flood lighting ? interior / exterior led lighting
ZLED7001 universal led driver with temperature compensation ? 2010 zentrum mikroelektronik dresden ag ? rev. 1.1 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. ZLED7001 block diagram sop-8 package dimensions (mm, except ) a 1.550 0.200 e 3.900 0.100 a1 0.175 0.075 e1 6.020 0.220 a2 1.450 typical e 1.270 typical b 0.420 0.070 l 0.835 0.435 c 0.214 0.036 4 4 d 4.900 0.100 ordering information sales code description package ZLED7001-zi1r ZLED7001 ? universal led driver with temperature compensation sop8 (tape & reel) ZLED7001kit-e1 ZLED7001 evaluation board up to 24vac / 40vdc, including 1 zled-pcb1 kit zled-pcb1 test pcb with one 3w white hb-led, cascadable to one multiple led string printed circuit board zled-pcb2 10 unpopulated test pcbs for modular led string with footpr ints of 9 common hb-led types printed circuit board 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 development. its characteristics and specifications are subject to change without notice. zentrum mikroelektronik dresden ag (zmd ag) assumes no obligation regarding future manufacture unless otherwise agreed to in writing. the information furnished hereby is believed to be true and accurate. however, under no circumstances shall zmd ag be liable to any customer, licensee, or any other third party for any special, indirect, incidental, or consequential damages of any kind or nature whatsoever arising out of or in any way related to the furnishing, performance, or use of this technical data. zmd ag hereby expressly disclaims any liability of zmd ag to any customer, licensee or any other third party, and any such customer, l icensee and any other third party hereby waives any liability of zmd ag for any damages in connection with or arising out of the furnishing, performance or use of this technical data, whether based on contract, warrant y, tort (including negligence), strict liability, or otherwise .
ZLED7001 universal led driver with temperature compensation data sheet august 12, 2010 ? 2010 zentrum mikroelektronik dresden ag ? rev. 1.1 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 subject to changes without notice. 4 of 15 contents 1 ic characte ristics ............................................................................................................. ............................................. 5 1.1. absolute maxi mum rati ngs ................................................................................................................................... 5 1.2. operating c onditio ns ........................................................................................................... .................................. 5 1.3. electrical parameters.......................................................................................................... ................................... 5 2 circuit de scripti on ............................................................................................................ ............................................. 7 2.1. ZLED7001 blo ck diagr am ......................................................................................................... ............................ 7 2.2. application si gnal flow.......................................................................................................................................... 7 2.3. input voltage regula tor ......................................................................................................................................... 8 2.4. current se nsing ................................................................................................................ ..................................... 9 2.5. timing cir cuit ................................................................................................................. ........................................ 9 2.6. pwm dimming applic ation ci rcuit ................................................................................................ ......................... 9 2.7. linear dimming appl ication ci rcuit ............................................................................................. ........................... 9 2.8. temperature co mpensa tion ....................................................................................................... ......................... 10 2.9. design example................................................................................................................. .................................. 10 3 esd/latch-up- protec tion ........................................................................................................ .................................... 12 4 pin configurati on and pa ckage .................................................................................................. ................................. 13 5 ordering in formati on ................................................................................................................................................... 15 6 document revi sion hist ory ...................................................................................................... ................................... 15 list of figures figure 2.1 input cu rrent .................................................................................................................. ................................ 8 figure 4.1 pin configurat ion zled 7001..................................................................................................... ................... 13 figure 4.2 package draw ing so p-8.......................................................................................................... .................... 14 list of tables table 1.1 absolute maxi mum rati ngs............................................................................................................................ 5 table 1.2 operating c onditio ns........................................................................................................... ........................... 5 table 1.3 electrical conditi ons .......................................................................................................... ............................. 5 table 4.1 pin descripti on sop-8.......................................................................................................... ........................ 13 table 4.2 package dimensi ons sop-8 ....................................................................................................... ................. 14
ZLED7001 universal led driver with temperature compensation data sheet august 12, 2010 ? 2010 zentrum mikroelektronik dresden ag ? rev. 1.1 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 subject to changes without notice. 5 of 15 1 ic characteristics 1.1. absolute maximum ratings table 1.1 absolute maximum ratings no. parameter symbol conditions min typ max unit 1.1.1 input voltage v in -0.3 8 v 1.1.2 voltage to gnd at pin cs, ld, pwmd, gate, t off , v ref v cs , v ld , v pwmd , v gate , v toff , v vref -0.3 6 v 1.1.3 input current v in pin 1 i vin 1 10 ma 1.1.4 junction temperature t j max 150 c 1.1.5 storage temperature t st -55 150 c 1.2. operating conditions table 1.2 operating conditions no. parameter symbol conditions min typ max unit 1.2.1 operating temperature t op -40 +85 c 1.2.2 input dc supply voltage v indc resistor r in required between dc supply voltage and v in pin with resistance determined by equation (2) and with prop er voltage rating. 2 8 450 v 1.3. electrical parameters production testing of the chip is performed at 25c. f unctional operation of the chip and specified parameters at other temperatures are guaranteed by design, characterization, and process control. test conditions: v in = 12v; t amb = 25c; r in =2k ? ; unless otherwise noted. table 1.3 electrical conditions no. parameter symbol conditions min typ max unit 1.3.1 v in clamp voltage v incl always higher than under voltage lockout threshold 6.6 7.1 7.6 v 1.3.2 operation current i in v in = 6v, gate floating 0.33 0.5 0.64 ma 1.3.3 under voltage lockout threshold v ulo v in rising 6.1 6.5 6.8 v 1.3.4 under voltage lockout hysteresis v ulo v in falling 500 mv 1.3.5 pwmd pin input low voltage v enl 1.2 v 1 beyond the input current range, v in might not clamp at 7.1v 2 this parameter limit is guaranteed by design, charac terization, and application c heck. see equation (2) on page 8
ZLED7001 universal led driver with temperature compensation data sheet august 12, 2010 ? 2010 zentrum mikroelektronik dresden ag ? rev. 1.1 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 subject to changes without notice. 6 of 15 no. parameter symbol conditions min typ max unit 1.3.6 pwmd pin input high voltage v enh 2 v 1.3.7 pwmd pin pull-up resistance r en 100 k ? 1.3.8 current sense threshold voltage v csth 215 240 265 mv 1.3.9 ld pin voltage low threshold v ldl 50 mv 1.3.10 ld pin voltage high threshold v ldh 240 mv 1.3.11 current sense blanking interval t blank 400 480 550 ns 1.3.12 output delay t delay v cs = v csth + 50mv, after t blank 30 ns 1.3.13 off time t off t off pin floating 480 510 550 ns 1.3.14 gate output rise time t rise c gate = 500pf 19 ns 1.3.15 gate output fall time t fall c gate = 500pf 29 ns 1.3.16 ref pin voltage v ref 1.12 1.20 1.30 v 1.3.17 ref pin load current i ref 0.5 ma 1.3.18 load regulation of reference voltage v refload i ref = 0 to 500a, pwmd = 5.0v 0.5 5 mv
ZLED7001 universal led driver with temperature compensation data sheet august 12, 2010 ? 2010 zentrum mikroelektronik dresden ag ? rev. 1.1 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 subject to changes without notice. 7 of 15 2 cir cuit description the ZLED7001 is a peak current-mode-control led driver ic that operates in constant off-time mode, enabling proper led current control wi thout additional loop compensation or high-side current sensing. the ZLED7001 supports both linear and pwm control of the led current. only a few external components are needed for typical applications. it is well-suited for buck led driver applications. 2.1. ZLED7001 block diagram bandgap blanking 480ns rs por uvlo nled l1 r2 ntc 5 6 d1 r cs c led q1 v s c in c1 r1 8 to 450 vdc 2 3 1 r in cs ld v ref v in pwmd gate gnd 4 7 c off t off ZLED7001 timing circuit 7.1v clamp r r r 0.24v 0.05v + + ? ? + ? 0.24v driver r s q cmp1 cmp2 cmp3 8 vdda vdda vddd voltage regulator r en 2.2. application signal flow a capacitor between the t off pin and ground determines the internal timer?s off-time. the timer pulses set flip- flop in the ZLED7001, turning on the gate pin driver, which is connected to the q1 external mosfet. when q1 turns on, a ramp current flows through the led(s) , the l1 external inductor, and the external sense resistor r cs . this results in a ramp voltage applied at the cs pin, which the ZLED7001?s two internal comparators continually compare to the voltage at its ld pin and its internal 240mv reference. if either comparator goes high and the blanking time is expired (see table 1.3 ), the flip-flop is reset, causing the gate pin output to go low, shutting off the current thro ugh the led(s). the peak current control scheme with constant off-time can easily operate at duty cycles higher than 0.5 and also gives inherent input voltage rejection, making t he led current almost insensitive to input voltage variations.
ZLED7001 universal led driver with temperature compensation data sheet august 12, 2010 ? 2010 zentrum mikroelektronik dresden ag ? rev. 1.1 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 subject to changes without notice. 8 of 15 2.3. input voltage regulator the value and rating of the r in input resistor must be selected as needed to drop the application supply voltage (v s ) to the proper operating voltage for the ZLED7001 specified in section 1 (see equation (2) below). whe n these conditions are met, the ZLED7001?s inter nal input voltage regulator maintains a stable 7.1v (typical) at the v in pin to power the ZLED7001. a low-equivalent-s eries-resistance (esr) bypass capacitor is required on the v in pin to provide a low-impedance path for the gate pin output driver?s high frequency current. the v in pin draws an input current that is the sum of the 0. 5ma (typical) required by the internal circuit and the average current drawn by the gate driver. the gate driver current is primarily determined by the gate charge (q g ) and switching frequency (f s ) of the external mosfet as shown in equation (1) . ?? sg in fqma5.0i ?? ? (1) where f s = switching frequency g q = external mosfet gate charge (re fer to the mosfet data sheet) the input resistor r in value is given by equation (2) . in in indc in i vv r ? ? (2) for two typical mosfet types, the following i in diagram will result: figure 2.1 input current
ZLED7001 universal led driver with temperature compensation data sheet august 12, 2010 ? 2010 zentrum mikroelektronik dresden ag ? rev. 1.1 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 subject to changes without notice. 9 of 15 2.4. current sensing assuming a 30% current ripple in the inductor, the sense resistor r cs can be calculated as shown in equation (3) : led csth cs i15.1 v r ? ? (3) where v csth = 240mv (typical) the current sense input of the ZLED7001 is connected to the non-inverting inputs of two comparators. the inverting terminal of one comparator is tied to an internal 240mv reference and the inverting terminal of the other comparator is connected to the ld pin. the ou tputs of both comparators are fed into an or gate, and the output of the or gate is connected to the reset pin of the flip-flop. thus , the comparator that has the lower voltage at the inverting input determines when the gate output is turned off. the comparator outputs also include a typical 480ns bl anking time that prevents spurious turn-offs of the external mosfet due to the turn-on spike normally pres ent as a result of transistor gate-source capacitance. in rare cases, this internal blanking time might not be enough to filter out the turn-on spike. if so, an external rc filter must be added between the external sense resistor (r cs ) and the cs pin. note that the comparators are relatively fast: 80ns ty pical response time. invalid triggering by these com- parators could result if the layout fails to minimize external inductances. 2.5. timing circuit the timing circuit in the ZLED7001 is controlled by a single capacitor connected from t off to ground. t off , the time of the cycle period, is given by equation (4) : ? ? ? ? ? ? ? ? ??? pf10 c 1ns510 t off time_off (4) 2.6. pwm dimming application circuit for pwm dimming applications, the ZLED7001?s pwmd pi n is driven with a low-frequency square-wave control signal. the gate pin?s driver is enabled when t he control signal is high and disabled when the control signal is low. the led current?s rise and fall rate is controlled only by the indu ctance value, the supply voltage, and led forward voltage. if the pwmd pin is allowed to float, the pwm dimming function is disabled. 2.7. linear dimming application circuit for linear dimming applications, an external voltage ranging from 50mv (typical) to 240mv (typical) is applied to the ld (linear dimming) pin to control the led current during operation. linear dimming can be used to adjust the led current level to reduce the led?s bright ness. in this case, connect a resistor between the vref pin and the ld pin and connect a negative-temper ature-coefficient (ntc) thermistor between the ld pin and ground. the ZLED7001 can also provide temperature compensation, (see the application circuit on page 2 and section 2.8 ).
ZLED7001 universal led driver with temperature compensation data sheet august 12, 2010 ? 2010 zentrum mikroelektronik dresden ag ? rev. 1.1 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 subject to changes without notice. 10 of 15 a group of modules based on the ZLED7001 can be matched in led brightness using the linear dimming input with the pwm dimming feature still ava ilable for overall brightness control. if the ld pin is not used, it must be connected to the pwmd pin, which is internally pulled-up. when the ld pin voltage drops below 50mv, the gate output is switched off. 2.8. temperature compensation ZLED7001 provides thermal protection for the connect ed leds. applying an ntc thermistor close to the led string will enable the temperature compensation of t he led current. refer to the application circuit on page 2 . if the temperature of the leds ri ses, the resistance of the ntc thermist or decreases until the voltage of the ld pin falls below 240mv. then the average current is controlled by the ld pin and the temperature compensation function starts. the upper threshold to start compensation is given by equation (5) : ? ? ? ? ? ? ? ? ? ?? ? 1rr r vmv240~v ntc ntc ref ldh (5) considering the limit for i ref , under all conditions r1 must be selected larger than 2.2k ? . assuming a 30% inductor current ripple, the tem perature compensated continuous cu rrent can be computed as shown in equation (6) : ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? 1rr r r15.1 v i ntc ntc s ref out (6) when the ld pin voltage drops belo w 50mv (typical), the gate output is switched off. the transition to dimming as well as the switch-off is reversible as soon as the respective thresholds are exceeded after the led assembly cools. adding a capacitor c1 from the ld pin to ground will reduce noise on the ld input. 2.9. design example a common application for an ac-line-powered ZLED7001 is luminants with a string of several leds operated by one driver. for the example, the fo llowing constraints are assumed: application: 15w led luminant with 13 hb leds in 1 string ac supply voltage: v inac = 230 vac average dc supply voltage: v indc 280 vdc resulting after bridge rectification and filtering with a 10 f capacitor; power factor correction is not considered. led string forward voltage: v f = 13*3.3v 43v led string average current: i led = 350ma ic input resistor (r in ) and hold capacitor (c in ): for a given 2n60 mosfet and a maximum expected switch ing frequency of 100khz, the ic input current will be ?? 4.1)1009(5.0 5.0 ? ? ? ????
ZLED7001 universal led driver with temperature compensation data sheet august 12, 2010 ? 2010 zentrum mikroelektronik dresden ag ? rev. 1.1 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 subject to changes without notice. 11 of 15 resulting in a supply resistor of ?? ? ? ? ? k ma vv i vv r in in indc in 195 4.1 7280 an 180k ? type can be chosen with a power rating of 0.5w. c in is chosen to be a 10 f/ 10v capacitor. t off time capacitor (c off ) the selection of the operation frequency is based on a tradeoff between higher frequencies allowing for smaller and less expensive inductors and lower frequencies incurring lower losses in the power switch. an estimation of the duty cycle d is based on the ratio of output voltage over input voltage: 15.0 280 43 _ _ _ ?? ? ? ? ? v v v v t t t d indc f time off timeon timeon a timing capacitor of 220pf yields s pf pf s pf c s t off time off ? ? ? 7.11 10 220 151.0 10 151.0 _ ? ? ? ? ? ? ? ? ? ??? ? ? ? ? ? ? ? ? ??? resulting in an operation frequency of khz s t d f time off o 72 7.11 15.011 _ ? ? ? ? ? ? inductor (l1) the inductance l1 is determined by the led string?s forw ard voltage, the off-time, and the acceptable current ripple. assuming a ripple of 30% of the average current yields mh ma sv i tv l ripple time offf 8.4 350%30 7.1143 _ ? ? ? ? ?? ? ? lower ripple at the same average curr ent will increase the lifetime of the leds but requires a more expensive higher value inductor and increased thermal losses si nce the inductor?s dc resistance will increase as well. the dc resistance of the inductor is an important design parameter, too. a capacitor placed in parallel with the array of leds can be used to reduce the led cu rrent ripple while keeping the same average current. the inductor chosen must have a saturation current higher than the peak output cu rrent and a continuous current rating above the required mean output current. t he circuit design must also consider the decrease of inductance and saturation current with rising temperature. current sense resistor (r cs ) with peak current-mode control, t he output is switched off when the led current reaches its maximum value summing up the average led current and half of the defi ned current ripple, yielding for the given example ma ma ma i ii ripple avgled peako 5.402 2 350%30 350 2 )( _ ? ? ???? the current sense resistor can now be calculat ed from the internal comparator threshold v csth and the peak current as ?? ?? 596.0 5.402 240 _ ma mv i v r peako csth cs this value can be built by a 0.68 ? in parallel with a 4.7 ? type.
ZLED7001 universal led driver with temperature compensation data sheet august 12, 2010 ? 2010 zentrum mikroelektronik dresden ag ? rev. 1.1 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 subject to changes without notice. 12 of 15 mosfet (q1) and diode (d1) the mosfet and diode must be dimensioned with a minimu m 50% safety rating of their relevant voltage and current parameters. thus a fet with minimum 500v dr ain-source breakdown voltage and 0.6a drain current as well as a fast recovery diode with at least 500 v reverse voltage and a 0.6a forward current may be selected. 3 esd/latch-up-protection all pins have an esd protection of > 2000v accordi ng human body model (hbm). the esd test follows the human body model with 1.5 k ? /100 pf based on mil 883-g, method 3015.7 latch-up protection of > 100ma has been proven based on jedec no. 78a feb. 2006, temperature class 1.
ZLED7001 universal led driver with temperature compensation data sheet august 12, 2010 ? 2010 zentrum mikroelektronik dresden ag ? rev. 1.1 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 subject to changes without notice. 13 of 15 4 pin c onfiguration and package figure 4.1 pin configuration ZLED7001 v in t off cs gate gnd ld pwmd v ref table 4.1 pin description sop-8 pin name no. description v ref 1 1.2v reference voltage. no bypass capacitor needed. pwmd 2 pwm dimming input. the gate driver operates normall y if pwmd is pulled high. the gate driver is turned off if pwmd is pulled to gnd or open. ld 3 linear dimming input. if the voltage at ld is < 240mv (typical), ld controls the current sense threshold. can also be used as temper ature compensation threshold voltage. gnd 4 internal circuit ground reference. electrical connection to ground is required. gate 5 output for external n-channel power mosfet gate driver. cs 6 current sense pin that senses the q1 mosfet drain current through external resistor r cs . the gate output goes low if the voltage at cs > the voltage at the ld pin or the internal 240mv. t off 7 sets the off-time of the power mosfet. if left floating, off-time will be 510ns. for increased off-time, a capacitor must be connected between t off and gnd. v in 8 supply input of 8v to 450v through a resistor, clamped at 7.1v internally. low-esr bypass capacitor to gnd is required.
ZLED7001 universal led driver with temperature compensation data sheet august 12, 2010 ? 2010 zentrum mikroelektronik dresden ag ? rev. 1.1 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 subject to changes without notice. 14 of 15 figure 4.2 package drawing sop-8 t able 4.2 package dimensions sop-8 dimension (mm) dimension (mm, except ) symbol min max symbol 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 (junction to ambient) of r ja = 80 k/w.
ZLED7001 universal led driver with temperature compensation data sheet august 12, 2010 ? 2010 zentrum mikroelektronik dresden ag ? rev. 1.1 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 subject to changes without notice. 15 of 15 5 ordering information product sales code description package ZLED7001-zi1r ZLED7001 ? universal led driver with te mperature compensation sop8 (tape & reel) ZLED7001kit-e1 ZLED7001 evaluation board up to 24vac / 40vdc, including 1 zled- pcb1 kit zled-pcb1 test pcb with one 3w white hb-led, cascadable to one multiple led string printed circuit board zled-pcb2 10 unpopulated test pcbs for modular led string with footprints of 9 common hb-led types printed circuit board 6 docu ment revision history revision date description 1.0 june 2, 2010 production release version 1.1 august 12, 2010 removed references to therma l shutdown protection in ?features? section and in section 2.9. updated contact information updated block diagram connection for correct pwmd internal connection. 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 development. its ch aracteristics and specifications are subject to change without notice. zentrum mikroelektronik dresden ag (zmd ag) assumes no obligation regarding future manufacture unless otherwise agreed to in writing. the information furnished hereby is believed to be true and accurate. however, under no circumstances shall zmd ag be liable to any customer, licensee, or any other third party for any special, indirect, incidental, or consequential damages of any kind or nature whatsoever arising out of or in any way related to the furnishing, performance, or use of this technical 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 third party hereby waives any li ability of zmd ag for any damages in connection with or arising out of the furnishing, performance or use of this technical data, whether based on contract, warranty, tort (includi ng negligence), strict liability, or otherwise.
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