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data sheet rev. 1.1 / august 2010 zled7000 40v led driver with internal switch
zled7000 40v led driver with internal switch ? 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 zled7000, one of our zled family of led control ics, is an inductive step-down converter that is optimal for driving a single led or multiple leds (connected in series) from a voltage source greater than the voltage rating of the led. the zled 7000 operates in continu- ous mode. capable of operating efficiently with voltage supplies ranging from 6 vdc to 40 vdc, it is ideal for low-voltage lighting applications. the zled7000 minimizes current consumption by remaining in a low- current standby mode (outpu t is off) until a voltage of 0.3v is applied to the adj pin. in operating mode, the zled7000 can source leds with an output current of 750ma ( 30 watts of output power) that is externally adjustable. * the zled7000?s integr ated output switch and high-side current sensing circuit use an external resistor to adjust the average output current. linearity is achieved via an external control signal at the zled7000?s adj pin, implemented either as a pulse-width modulation (pwm) waveform for a gated output current or a dc voltage for a continuous current. zled7000 application circuit v in adj gnd i sense lx zled7000 v s n led l1 c1 1 f r s d1 47 h 6 to 40 vdc 54 1 2 3 * see section 2.3 for details features ? capable of up to 95% efficiency* ? operates in continuous mode with a wide input range from 6 vdc to 40 vdc ? integrated 40v power switch ? one pin on/off or brightness control via pwm or dc voltage control signal input ? switching frequency: 1mhz ? dimming rate: 1200:1 (typical) ? output current accuracy: 5% (typical) ? built-in thermal shutdown and open-circuit protection for led ? very few external components needed for operation ? broad range of applications: outputs up to 750ma ? sot89-5 package application examples ? illuminated led signs and other displays ? led traffic and street lighting (low-voltage) ? architectural led lighting, including low-voltage applications for buildings ? halogen replacement leds (low-voltage) ? led backlighting ? general purpose exterior and interior led lighting, including applications requiring low-voltage ? general purpose low-voltage industrial applications
zled7000 40v led driver with internal switch ? 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. sot89-5 package dimensions and pin assignments b b1 e1 e d d1 l e1 e lx v in gnd thermal pad adj i sense dimension (mm) dimension (mm) symbol min max symbol min max a 1.400 1.600 e 2.300 2.600 b 0.320 0.520 e1 3.940 4.250 b1 0.360 0.560 e 1.500 typ c 0.350 0.440 e1 2.900 3.100 d 4.400 4.600 l 0.900 1.100 d1 1.400 1.800 ordering information 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 he reby 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, incident al, 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 dis claims 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 liability of zmd ag for any dama ges in connection with or arising out of the furnishing, perfor- mance or use of this technical data, whether based on contract, warranty, tort (including negligence), strict liability, or oth erwise. product sales code description package zled7000-zi1r zled7000 ? 40v led driver sot89-5 (tape & reel) ZLED7000KIT-D1 zled7000 used in a mr16 halogen replacement demo kit 12vac/vdc, including 1 zled-pcb1 kit zled-pcb1 test pcb with one 3w 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 with footprints of 9 common hb led types printed circuit board (pcb)
zled7000 40v led driver with internal switch 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 19 contents 1 ic characte ristics ............................................................................................................. ............................................. 6 1.1 absolute maxi mum rati ngs ................................................................................................................................... 6 1.2 operating c onditio ns ........................................................................................................... .................................. 6 1.3 electrical parameters.......................................................................................................... ................................... 6 1.4 characteristic o perating curves................................................................................................ ............................ 8 2 circuit de scripti on ....................................................................................................................................................... 10 2.1 voltage supply................................................................................................................. .................................... 10 2.2 zled7000 sta ndby mo de.......................................................................................................... .......................... 10 2.3 output current cont rol......................................................................................................... ................................ 10 2.3.1 output current and r s ............................................................................................................................... ... 10 2.3.2 pwm cont rol .................................................................................................................... ............................ 11 2.3.3 external dc voltage cont rol of out put cu rrent .................................................................................. .......... 11 2.3.4 microcontroller led cont rol.................................................................................................... ...................... 12 3 application cir cuit de sign ........................................................................................................................................... 13 3.1 external component ? induc tor l1 ............................................................................................... ....................... 13 3.2 external component ? capaci tor c1 .............................................................................................. ..................... 14 3.3 external compone nt ? dio de d1 .................................................................................................. ....................... 14 3.4 output ripple.................................................................................................................. ..................................... 15 4 operating c onditions................................................................................................................................................... 16 4.1 thermal c onditi ons............................................................................................................. ................................. 16 4.2 thermal shut-dow n protection................................................................................................... ......................... 16 4.3 open-circuit protec tion........................................................................................................ ................................ 16 5 esd/latch-up- protec tion ........................................................................................................ .................................... 16 6 pin configurati on and pa ckage.................................................................................................. ................................. 17 7 layout requ irements .................................................................................................................................................. 18 7.1 layout consid erations for adj (pin 3).......................................................................................... ....................... 18 7.2 layout consid erations for lx (pin 1) ........................................................................................... ........................ 18 7.3 layout considerations for v in (pin 5) and the external decoupling capac itor (c 1)............................................. 18 7.4 layout consid erations for gnd (pin 2).......................................................................................... ...................... 18 7.5 layout consider ations for high voltage traces.................................................................................. ................. 18 7.6 layout considerat ions for the exte rnal co il ( l1) ............................................................................... .................. 18 7.7 layout considerations for the external current sense resistor (r s ) .................................................................. 18 8 ordering in formati on ................................................................................................................................................... 18 9 document revi sion hist ory ...................................................................................................... ................................... 19
zled7000 40v led driver with internal switch 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 19 list of figures figure 2.1 directly driving adj input with a pwm control signal ................................................................................. 11 figure 2.2 external dc control voltage at adj pin ....................................................................................................... 11 figure 2.3 driving adj input from a microcontroller ...................................................................................................... 12 figure 3.1 output ripple reduction .............................................................................................................................. 1 5 figure 6.1 pin configuration and package drawing sot89-5 ...................................................................................... 17 list of tables table 1.1 absolute maxi mum ratings ............................................................................................................................ 6 table 1.2 operating conditions ...................................................................................................................................... 6 table 1.3 electrical parameters ..................................................................................................................................... 6 table 4.1 pin description sot89-5 .............................................................................................................................. 1 7 table 4.2 .................................................................................................................... 17 package dimensions sot89-5
zled7000 40v led driver with internal switch 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 19 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 50 v v in > 5v v in - 5 v in + 0.3 v 1.1.2 i sense voltage v isense v in < 5v 0 v in + 0.3 v 1.1.3 lx output voltage v lx -0.3 50 v 1.1.4 adjust pin input voltage v adj -0.3 6 v 1.1.5 switch output current i lx sot89-5 900 ma 1.1.6 power dissipation p tot sot89-5 1200 mw 1.1.7 storage temperature t st -55 150 c 1.1.8 junction temperature t j max 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 voltage v in 6 40 v 1.3 electrical parameters production testing is at 25c. at other temperatures with in the specified operating range, functional operation of the chip and specified parameters are guaranteed by characterization, design, and process control. test conditions are t amb = 25c; v in = 12v except as noted. table 1.3 electrical parameters no. parameter symbol conditions min typ max unit 1.3.1 quiescent supply current with output off i inqoff adj pin grounded 40 60 80 a 1.3.2 quiescent supply current with output switching i inqon adj pin floating 450 600 a 1.3.3 mean current sense threshold voltage v sense 91 95 101 mv 1.3.4 sense threshold hysteresis v sensehys 15 % 1.3.5 i sense pin input current i sense v sense = 0.1v 8 10 a 1.3.6 internal reference voltage v ref measured on adj pin with pin floating 1.2 v 1.3.7 external control voltage range on adj pin for dc brightness control v adj 0.3 1.2 v
zled7000 40v led driver with internal switch 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 19 no. parameter symbol conditions min typ max unit 1.3.8 dc voltage on adj pin to switch chip from active (on) state to quiescent (off) state v adjoff v adj falling 0.15 0.2 0.25 v 1.3.9 dc voltage on adj pin to switch chip from quiescent (off) state to active (on) state v adjon v adj rising 0.2 0.25 0.3 v 1.3.10 resistance between adj pin and v ref r adj 500 k? 1.3.11 continuous lx switch current i lxmean 0.65 0.75 a 1.3.12 lx switch leakage current i lx(leak) 1 a 1.3.13 lx switch on resistance r lx 0.9 1.5 ? 1.3.14 brightness control range at low frequency pwm signal d pwm(lf) pwm frequency =100hz pwm amplitude=5v, v in =15v, l=27 h, driving 1 led 1200:1 1.3.15 brightness control range at high frequency pwm signal d pwm(hf) pwm frequency =10khz pwm amplitude=5v, v in =15v, l=27 h, driving 1 led 13:1 1.3.16 operat ing frequency f lx adj pin floating l=100 h (0.82 ? ) i out =350ma @ v led =3.4v, driving 1 led 154 khz 1.3.17 minimum switch on time t onmin lx switch on 200 ns 1.3.18 minimum switch off time t offmin lx switch off 200 ns 1.3.19 recommended maximum operating frequency f lxmax 1 mhz 1.3.20 recommended duty cycle range of output switch at f lxmax d lx 0.2 0.8 1.3.21 internal comparator propagation delay t pd 50 ns 1.3.22 thermal shutdown temperature t sd 140 c 1.3.23 thermal shutdown hysteresis t sd-hys 20 c
zled7000 40v led driver with internal switch 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 19 1.4 c haracteristic operating curves the curves are valid for the typical application circuit and t amb = 25c unless otherwise noted.
zled7000 40v led driver with internal switch 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 19
zled7000 40v led driver with internal switch 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 19 2 cir cuit description the zled7000 is an inductive step-down converter for driving leds. it operates in continuous mode, enabling proper led current control. the zled7000 supports linear or pwm cont rol of the led current. only a few external components are needed for typical applications. 2.1 v oltage supply the zled7000 has an internal regulator that disables the lx output until the voltage supply rises above a start-up threshold voltage set internally as needed to ensure that the power mosfet on-resistance is low enough for proper operation. when the supply voltage e xceeds the threshold, the zled7000 begins normal operation. important: the zled7000 must be operated within the operating voltage range specified in table 1.2 to avoid con ditions that could result in thermal damage to the zled7000. operating with the supply voltage below the minimum can result in a high switch duty cycle and ex cessive zled7000 power dissipation, risking over- temperature conditions (also see section 4.1 regarding thermal restrictions) that could result in activation of the zled70 00?s thermal shut-down circuitry. with multiple leds, the forward drop is typically adequate to prevent the chip from switching below the minimum voltage supply specification (6v), so there is less risk of thermal shut-down. 2.2 z led7000 standby mode whenever the adj pin voltage falls below 0.2v, the zled7000 turns the output off and the supply current drops to approximately 60 a. this standby mode minimizes current consumption. 2.3 o utput current control the led control current output on the lx pin is deter mined by the value of external components and the control voltage input at the adj pin. selection of the external component r s is discussed below, and other external components are discussed in section 2.3.4 . the subsequent sections describe the two options for control voltag e input at the adj pin: a pulse width modu lation (pwm) control signal or a dc control voltage. the adj pin has an input impedance ? of 500k ? 25%. 2.3.1 output current and r s the current sense threshold voltage and the value of the external current sense resistor (r s ) between v in and i sense set the output current through the leds (i out ). equation (1) below shows this basic relationship. unless the adj pi n is driven from an external voltage (see section 2.3.3 ), the minimum value for r s is 0.13 ? to prevent exceeding the maximum switch current (see table 1.1 ). s out r mv95 i ? (1) where i out = nominal average output current through the led(s) r s 0.13? ? at room temperature.
zled7000 40v led driver with internal switch 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 19 2.3.2 pwm control the outp ut current on lx can be set to a value below the nominal average value determined by resistor r s by using an external pwm signal as the control signal app lied to the adj pin. this control signal must be capable of driving the zled7000?s internal 500k ? pull-up resistor. see figure 2.1 for an illustration. the minimum sign al voltage range is 0v to 1.8v; t he maximum voltage range is 0v to 5v. see table 1.3 for the spe cifications for the signal?s duty cycle d pwm . any negative spikes on the control signal could interfere with current control or proper operation of the zled7000. figure 2.1 directly driving adj input with a pwm control signal 7000 zled gnd adj 1.8v to 5v 0v pwm 2.3.3 external dc voltage control of output current the outp ut current on lx can be set to a value below the nominal average value determined by resistor r s by using an external dc voltage v adj (0.3 v v adj 1.2v) to drive the voltage at the adj pin. this allows adjusting the output current from 25% to 100% of i outnom . see figure 2.2 for an illustration. the output current can be calculated using equation (2) . if v adj matches or exceeds v ref (1.2v), the brightness setting is clamped at its maximum (100%). figure 2.2 external dc control voltage at adj pin adj gnd zled7000 dc s adj dc_out r v079.0 i ? ? (2) where i out_dc = nominal average output current through the led(s) with a dc control voltage v adj = external dc control voltage: 0.3 v v adj 1.2v r s 0.13?
zled7000 40v led driver with internal switch 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 19 2.3.4 microcontroller led control a micro controller?s open-drain output can control current to the led(s) by outputting a pwm control signal to the adj input of the zled7000. see figure 2.1 for an example circuit. figure 2.3 driving adj input from a microcontroller 10k mc adj gnd zled7000
zled7000 40v led driver with internal switch 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 19 3 application circuit design the following sections cover selection of the external components shown in the typical application illustrated on page 2 . 3.1 e xternal component ? inductor l1 select the inductor value for l1 as needed to ensure t hat switch on/off times are optimized across the load current and supply voltage ranges. select a coil that has a continuous current rating above the required average output current to the leds and a saturati on current exceeding the peak output current. recom- mendation: use inductors in the range of 15 h to 220 h with saturation current gr eater than 1a for 700ma output current or saturation current greater than 500ma for 350ma output current. for higher supply voltages with low output current, select higher values of inductanc e, which result in a sma ller change in output current across the supply voltage range (refer to the graphs in section 1.4 ). see section 7.6 for layout restrictions. equation s (3) and (4) illustrate calculating the timing for lx swit chi ng for the example application circuit shown on page 2. as given in table 1.3 , the minimum period for t on is 200ns; the minimum period for t off is also 200ns. lx switch off time t off in s where l coil inductance in h ? coil peak-peak ripple current in a * v led total led forward voltage in v v d diode forward voltage at the required load current in v i avg required average led current in a r s external current sense resistance in ? r l coil resistance in ? v in supply voltage in v r lx switch resistance in ? ls avg d led off rrivv il t ' (3) lx switch on time t on in s lxls avg led in on rrrivv il t ' (4) * with the zled7000, the current ripple ? i is internally set to an appropriate value of 0.3 * i avg . the inductance value has an equivalent effect on ton an d toff and therefore affects the switching frequency. for the same reason, the inductance has no influence on the duty cycle for which the relation of the summed led forward voltages n ? v f to the input voltage v in is a reasonable approximation. because the input voltage is a factor in the on time, variations in the input voltage affect the switchi ng frequency and duty cycle.
zled7000 40v led driver with internal switch 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 19 the following calculation example yields an operati ng frequency of 122khz and a duty cycle of 0.33: input data: v in =12v, l=220 h, r l =0.48 ? , v led =3.4v, i avg =333ma and v d =0.36v ?? s47.5 3.048.0a333.0v36.0v4.3 a333.03.0h220 t off ? ?? ? ? ???? ?? ? (5) and ?? s73.2 9.048.03.0a333.0v4.3v12 a333.03.0h220 t on ? ??? ? ? ????? ? ? ? (6) 3.2 e xternal component ? capacitor c1 to improve system efficiency, use a low-equivalent-ser ies-resistance (esr) capacitor for input decoupling because this capacitor must pass the input current ac component. the capacitor value is defined by the target maximum ripple of the supply voltage; the value is given by equation (7) . max onf min v ti c ? ? ? (7) where i f value of output current ?v max maximum ripple of power supply t on maximum on time of mosfet in the case of an ac supply with a rectifier, the c apacitor value must be chosen high enough to make sure that the dc voltage does not drop below the maximum forward voltage of the led string plus some margin for the voltage drops across the coil resistance, shunt resist or, and on resistance of the switching transistor. recommendation: use capacitor s with x5r, x7r, or better dielectric for maximum stability over temperature and voltage. do not use y5v capacitors for decoupling in this application. for higher capacitance values, aluminum electrolytic caps with high switching capability shoul d be used. in this case, improved perfor- mance can be reached by an additional x7r/x5 r bypass capacitor of at least 100nf. 3.3 ex ternal component ? diode d1 for the rectifier d1, select a high-speed, low-capaci tance schottky diode with low reverse leakage at the maximum operating voltage and temperature to ensure maximum efficiency and performance. important: choose diodes with a continuous current ra ting higher than the maximum output load current and a peak current rating above the peak co il current. when operating above 85c, the reverse leakage of the diode must be addressed because it can cause exce ssive power dissipation in the zled7000. note: silicon diodes have a greater forward voltage and overshoot caused by reverse recovery time, which can increase the peak voltage on the lx output. ensure that the total voltage appearing on the lx pin, including supply ripple, is within the specified range (see table 1.1 ).
zled7000 40v led driver with internal switch 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 19 3.4 ou tput ripple shunt a capacitor c led across the led(s) as shown in figure 3.1 to minimize the peak-to-peak ripple current in the led if necessary. figure 3.1 output ripple reduction v in i sense lx zled7000 n led l1 c led r s d1 v s gnd adj c1 low esr capacitors should be used because the efficiency of c led largely depends on its esr and the dynamic resistance of the led(s). for an increased number of leds, usin g the same capaci tor will be more effective. lower ripple can be achieved with higher capa citor values, but this will increase start-up delay by reducing the slope of the led voltag e. the capacitor will not affect oper ating frequency or efficiency. for a simulation or bench optimization, c led values of a few f are an applicable starting point for the given configuration.
zled7000 40v led driver with internal switch 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. 16 of 19 4 oper ating conditions 4.1 thermal conditions refer to table 1.1 for maximum package power dissipation sp ecification s for the zled7000?s sot89-5 package. exceeding these specifications due to opera ting the chip at high ambient temperatures (see table 1.2 for maximum operating temperature range) or driving over the maximum load current (see table 1.1 ) can damag e the zled7000. the zled7000 can be used for led current applications up to750ma when properly mounted to a high wattage land pattern. conditions such as operating below the minimum supply voltage or inefficiency of the circuit due to improper coil selecti on or excessive parasitic capacitance on the output can cause excessive chip power dissipation. 4.2 th ermal shut-down protection the zled7000 includes an on-board temperature sensin g circuit which stops the output if the junction exceeds approximately 160c. 4.3 op en-circuit protection the zled7000 is inherently protected if there is an open-circuit in the connec tion to the leds because in this case, the coil is isolated from the lx pin. this preven ts any back emf from damaging the internal switch due to forcing the drain above its breakdown voltage. 5 esd/latch-up-protection all pins have an esd protection of > 2000v according to the human body model (hbm) except for pin 1, which has a protection level of > 1000v. 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.
zled7000 40v led driver with internal switch 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. 17 of 19 6 pin c onfiguration and package figure 6.1 pin configuration and package drawing sot89-5 table 4.1 pin description sot89-5 table 4.2 package dimensions sot89-5 dimension (mm) dimension (mm) symbol min max symbol min max a 1.400 1.600 e 2.300 2.600 b 0.320 0.520 e1 3.940 4.250 b1 0.360 0.560 e 1.500 typ c 0.350 0.440 e1 2.900 3.100 d 4.400 4.600 l 0.900 1.100 d1 1.400 1.800 the sot89-5 package has a thermal resistance (junction to ambient) of r ja = 45 k/w. pin name no. description lx 1 power switch drain gnd 2 ground (0v)?see section 7.4 for layout considerations adj 3 output current control pin?see section 2.3 for details isense 4 nominal average output current is set by the value of a resistor r s connected from isense to v in ? see section 2.3.1 for details vin 5 supply voltage (6v to 40v)?see section 7.3 for layout considerations b b1 e1 e d d1 l e1 e c a lx v in gnd thermal pad adj i sense
zled7000 40v led driver with internal switch 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. 18 of 19 7 layo ut requirements 7.1 la yout considerations for adj (pin 3) for applications in which the adj pin is unconnected, mi nimize the length of circuit board traces connected to adj to reduce noise coupling through this high impedance input. 7.2 la yout considerations for lx (pin 1) minimize the length of circuit board traces connected to the lx pin because it is a fast switching output. 7.3 la yout considerations for v in (pin 5) and the external decoupling capacitor (c1) the c1 input decoupling capacitor must be placed as cl ose as possible to the vin pin to minimize power supply noise, which can reduce efficiency. see section 3.2 regarding capacitor selection. 7.4 la yout considerations for gnd (pin 2) the zled7000 gnd (ground) pin must be soldered directly to the circuit board?s ground plane to minimize ground bounce due to fast switching of the lx pin. 7.5 la yout considerations for high voltage traces avoid laying out any high voltage traces near the adj pin to minimize the risk of leakage in cases of board contamination, which could raise t he adj pin voltage resulting in unintentional output current. leakage current can be minimized by laying out a ground ring around the adj pin. 7.6 layout considerations for the external coil (l1) the l1 coil must be placed as close as possible to the chip to minimize parasitic resistance and inductance, which can reduce efficiency. the connection between the coil and the lx pin must be low resistance. 7.7 layout considerations for the external current sense resistor (r s ) any trace resistance in series with r s must be taken into consideration when selecting the value for r s . 8 ordering information product sales code description package zled7000-zi1r zled7000 ? 40v led driver sot89-5 (tape & reel) ZLED7000KIT-D1 zled7000 used in a mr16 halogen replacement demo kit 12vac/vdc, including 1 zled-pcb1 kit zled-pcb1 test pcb with one 3w 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 with footprints of 9 common hb led types printed circuit board (pcb)
zled7000 40v led driver with internal switch 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. 19 of 19 9 d ocument revision history revision date description 1.0 june 10, 2010 production release version 1.1 august 12, 2010 revision to equation (5) for toff. update for contact information. 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 char acteristics 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 he reby 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, incident al, 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 dis claims 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 liability of zmd ag for any dama ges in connection with or arising out of the furnishing, perfor- mance or use of this technical data, whether based on contract, warranty, tort (including negligence), strict liability, or oth erwise.
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