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microsemi linfinity microelectronics division 11861 western avenue, garden grove, ca. 92841, 714-898-8121, fax: 714-893-2570 page 1 copyright ? 2000 rev. 1.1, 2002-11-21 www. microsemi . com lx1992 high efficiency led driver p roduction linfinity division description the lx1992 is a compact high efficiency step-up boost controller for driving white or color leds in backlight or frontlight systems and offers designers maximum flexibility with respect to efficiency and cost. the lx1992 features a pseudo- hysteretic pulse frequency modulation topology and uses an external n- channel mosfet. further, the lx1992 features cont rol circuitry that is optimized for portable systems (e.g., quiescent supply current of 80a (typ) and a shutdown current of less than 1a). these design enhancements provide for improved performance in battery operated systems applications. the device input voltage range is from 1.6v to 6.0, allowing for a wide selection of system battery voltages and start-up operation is guaranteed at 1.6v input. programming the output current is readily achieved by using one external current sense resistor in series with the leds. in this configuration, led current provides a feedback signal to the fb pin, maintaining constant current regardless of varying led forward voltage (v f ). moreover, the lx1992 is capable of achieving output currents in excess of 150ma, depending on the mosfet selected. the lx1992 has an additional feature for simple dynamic adjustment of the output current (i.e., up to 100% of the maximum programmed current). designers can make this adjustment via an analog reference signal or a direct pwm generated signal applied to the adj pin and any pwm amplitude is easily accommodated with a single external resistor. the lx1992 is available in both the 8- pin msop, and the miniature 8-pin mlp requiring minimal pcb area. important: for the most current data, consult microsemi ?s website: http://www.microsemi.com key features > 90% efficiency 80a typical quiescent supply current externally programmable peak inductor current limit for maximum efficiency logic controlled shutdown < 1a shutdown current dynamic output current adjustment via analog reference or direct pwm input 8-pin msop package or 8-pin mlp applicati ons/benefits pagers wireless phones pdas handheld computers general lcd bias applications led driver digital camera displays product highlight c 1 4.7 f l 1 47 h 1206 case size lx1992 gnd fb cs drv shdn in adj src r set 15? v bat = 1.6v to 6.0v on off v f = 3.6v typ. i led = 20ma to 0ma r cs 4 k ? package order info t a ( c) lm plastic mlp 8-pin du plastic msop 8-pin 0 to 70 lx1992clm lx1992cdu note: available in tape & reel. append the letter ?t? to the part number. (i.e. lx1992cdut) l l x x 1 1 9 9 9 9 2 2
microsemi linfinity microelectronics division 11861 western avenue, garden grove, ca. 92841, 714-898-8121, fax: 714-893-2570 page 2 copyright ? 2000 rev. 1.1, 2002-11-21 www. microsemi . com lx1992 high efficiency led driver p roduction linfinity division absolute maximum ratings supply voltage (v in ) ....................................................................... -0.3v to 7.0v feedback input voltage (v fb ).................................................-0.3v to v in + 0.3v shutdown input voltage (v shdn ) ...........................................-0.3v to v in + 0.3v analog adjust input voltage (v adj ) .......................................-0.3v to v in + 0.3v source input current (i src ) .................................................................... 0.80 a rms operating junction temperature.................................................................. 150 c storage temperat ure range...........................................................-65 c to 150 c lead temperature (soldering 180 seconds)................................................. 235 c note: exceeding these ratings could cause damage to the device. all voltages are with respect to ground. currents are positive into, negative out of specified terminal . thermal data du plastic msop 8-pin thermal resistance - junction to a mbient , ja 206 c/w thermal resistance - junction to c ase , jc 39 c/w lm plastic mlp 8-pin thermal resistance - junction to a mbient , ja 41 c/w thermal resistance - junction to c ase , jc 5.2 c/w junction temperature calculation: t j = t a + (p d x jc ). the ja numbers are guidelines for the therma l performance of the device/pc-board system. all of the above assume no ambient airflow. package pin out 1 2 4 3 5 6 8 7 drv fb in gnd src cs adj du p ackage (top view) shdn 4 3 2 1 5 6 7 8 lm p ackage (top view) drv fb in shdn src cs gnd adj functional pin description n ame d escription in unregulated ic supply voltage i nput ? input range from +1.6v to 6.0v. bypass with a 1 f or greater capacitor for operation below 2.0v. fb feedback input ? connects to a current sense resistor between the output load and gnd to set the output current. shdn active-low shutdown input ? a logic low shuts down the device and reduces the supply current to 0.2 a (typ). connect shdn to v cc for normal operation. drv mosfet gate driver ? connects to an external n-channel mosfet. cs current-sense amplifier input ? connecting a resistor between cs and gnd sets the peak inductor current limit. gnd common terminal for ground reference. adj adjustment signal input ? provides the internal referenc e, via an internal filter and gain resistor, allowing a dynamic output current adjustment corresponding to a vary ing duty cycle. the actual adj pin voltage range is from v in to gnd. in order to minimize the current sens e resistor power dissipation a practical range of v adj = 0.0v to 0.5v should be used. src mosfet current sense input - connects to the external n-channel mosfet source. note: adj pin should not be left floating. p p a a c c k k a a g g e e d d a a t t a a
microsemi linfinity microelectronics division 11861 western avenue, garden grove, ca. 92841, 714-898-8121, fax: 714-893-2570 page 3 copyright ? 2000 rev. 1.1, 2002-11-21 www. microsemi . com lx1992 high efficiency led driver p roduction linfinity division electrical characteristics unless otherwise specified, the following specificati ons apply over the operat ing ambient temperature 0 c t a 70 c except where otherwise noted and the following test conditions: v in = 3v, i load = 20ma , shdn = v in , and v adj = 300mv. lx1992 parameter symbol test conditions min typ max units ` operating voltage v in 1.6 6.0 v minimum start-up voltage v su t a = +25 c 1.6 v start-up voltage temperature coefficient k vst -2 mv/ c v fb > 0.3v 50 100 a quiescent current i q v shdn < 0.4v 0.2 0.5 a fb threshold voltage v fb 275 300 325 mv fb input bias current i fb v fb = 0.3v -100 100 na adj input voltage range v adj i out = (v adj )/(r set ) 0.0 v in v adj input bias current i adj vadj < 0.3v -150 0 na shutdown input bias current i shdn shdn = gnd -50 50 na shutdown high input voltage v shdn 1.6 v shutdown low input voltage v shdn 0.4 v current sense bias current i cs vfb < 0.3v 3.0 5.0 7.0 a minimum peak current i min r cs = 560 ? 53 83 ma efficiency v in = 3.0v, i load = 20ma 85 % ndrv sink current i snk v in = 5v 50 ma ndrv source current i src v in = 5v 100 ma off-time t off v fb = 0.3v; v adj =0.5v 100 500 ns simplified block diagram control logic reference logic adj fb shutdown logic shdn cs driver gnd drv in 5 a src 2.5m ? 50pf a b e e l l e e c c t t r r i i c c a a l l s s
microsemi linfinity microelectronics division 11861 western avenue, garden grove, ca. 92841, 714-898-8121, fax: 714-893-2570 page 4 copyright ? 2000 rev. 1.1, 2002-11-21 www. microsemi . com lx1992 high efficiency led driver p roduction linfinity division application circuits typical led driver applications c 1 4.7 f l 1 47 h 1206 case size lx1992 gnd fb cs drv shdn in adj src r set 15? v bat = 1.6v to 6.0v on off v f = 3.6v typ. i led = 0ma to 20ma r cs 4 k ? figure 1 ? led driver with full-range dimming via pwm input c 1 4.7 f l 1 47 h 1206 case size lx1992 gnd fb cs drv shdn in adj src r set 15? v bat = 1.6v to 6.0v on off v f = 3.6v typ. i led = 0ma to 20ma v adj = 0.0v to 0.3v + - r cs 4 k ? figure 2 ? led driver with full-range dimming via analog voltage input note : the component values shown are only examples for a worki ng system. actual values will vary greatly depending on desired parameters, efficiency, and layout constraints. a a p p p p l l i i c c a a t t i i o o n n
microsemi linfinity microelectronics division 11861 western avenue, garden grove, ca. 92841, 714-898-8121, fax: 714-893-2570 page 5 copyright ? 2000 rev. 1.1, 2002-11-21 www. microsemi . com lx1992 high efficiency led driver p roduction linfinity division application information o perating t heory the lx1992 is a pfm boost converter that is optimized for driving a string of series connected leds. it operates in a pseudo-hysteretic mode with a fixed switch ?off time? of 300ns. converter switching is enabled as led current decreases causing the voltage across r set to decrease to a value less than th e voltage at the vadj pin. when the voltage across r set (i.e., v fb ) is less than vadj, comparator a activates the cont rol logic. the control logic activates the drv output circuit that connects to the gate of the external fet. the drv output is switched ?on? (and remains ?on?) until the inductor current ramps up to the peak current level. this current level is set via the external r cs resistor and monitored through the cs and src inputs by comparator b. the led load is powered from energy stored in the output capacitor during the indu ctor charging cycle. once the peak inductor current value is achieved, the ndrv output is turned off (off-time is typically 300ns) allowing a portion of the energy stored in the inductor to be delivered to the load (e.g., see figure 5, channel 2). this causes the output voltage to continue to rise across r set at the input to the feedback circuit. the lx1992 continues to switch until the voltage at the fb pin exceeds the control voltage at the adj pin. the value of r set is established by dividing the maximum adjust voltage by the maximum series led current. a minimum value of 15 ? is recommended for r set . the voltage at the fb pin is the product of i out (i.e., the current through the led chain) and r set . ? ? ? ? ? ? = ledmax adjmax set i v r the application of an exte rnal voltage source at the adj pin provides for output current adjustment over the entire dimming range and the designer can select one of two possible methods. the first option is to connect a pwm logic signal to the adj pin (e.g., see figure 1). the lx1992 includes an internal 50 pf capacitor to ground that works with an external resistor to create a low-pass filter (i.e., filter out the ac co mponent of a pulse width modulated input of f pwm 100khz). the second option is to adjust the reference voltage directly at the adj pin by applying a dc voltage from 0.0 to 0.3v (e.g., see figure 2). the adjustment voltage level is selectable (with limited accuracy) by implementing th e voltage divider created between the external series resistor and the internal 2.5m ? resistor. disabling the lx1992 is achieved by driving the shdn pin with a low-level logic signal thus reducing the device power consumption to less than 0.5 a (typ). i nductor s election and o utput c urrent l imit p rogramming setting the level of peak inductor current to approximately 2x the expected maximum dc input current will minimize the inductor size, the input ripple current, and the output ripple voltage. the designer is encouraged to use inductors that will not saturate at the peak inductor current level. an inductor value of 47 h is recommended. choosing a lower value emphasizes peak current overshoot while choosing a higher value emphasizes output ripple voltage. the peak switch current is defined using a resistor placed between the cs terminal and ground and the i peak equation is: cs ics cs d in min peak r r i t l v i i ? ? ? ? ? ? ? ? ? ? ? ? + + = the maximum i peak value is limited by the i src value (max. = 0.8a rms ). the minimum i peak value is defined when r cs is zero. the value range for parameters i min and i cs are provided in the e lectrical c haracteristics section of this data sheet. the parameter t d is related to internal operation of the device. a typical value at 25 o c is 800ns. r ics is the internal current se nse resistor connected to the src pin. a typical value at 25 o c is 200m ? . all of these parameters have an effect on the final i peak value. d esign e xample : determine i peak where v in equals 3.0v and r cs equals 4.02k ? using nominal values for all other parameters. ? ? ? ? ? ? ? ? + ? ? ? ? ? ? + = k 02 . 4 200m a 0 . 5 800ns h 47 3.0v ma 73 i peak the result of this example yields a nominal i peak of approximately 225ma. o utput r ipple and c apacitor s election output voltage ripple is a function of the inductor value (l), the output capacitor value (c out ), the peak switch current setting (i peak ), the load current (i out ), the input voltage (v in ) and the output voltage (v out ) for a this boost converter regulation scheme. when the switch is first turned on, the peak-to-peak voltage ripple is a function of the output droop (as the inductor current charges to i peak ), the feedback transition error (i.e., typically 10mv), and the output overshoot (when the stored energy in the inductor is delivered to the load at the end of the charging cycle). therefore the total ripple voltage is v ripple = ? v droop + ? v overshoot + 10mv the initial droop can be estimated as follows where the 0.5 value in the denominator is an estimate of the voltage drop across the inductor and the fet?s r ds_on : the a a p p p p l l i i c c a a t t i i o o n n
microsemi linfinity microelectronics division 11861 western avenue, garden grove, ca. 92841, 714-898-8121, fax: 714-893-2570 page 6 copyright ? 2000 rev. 1.1, 2002-11-21 www. microsemi . com lx1992 high efficiency led driver p roduction linfinity division application information formula for ? v droop is: () () 0.5 v i i c l ? v in out pk out droop ? = ? ? ? ? ? ? ? ? the output overshoot can be estimated as follows where the 0.5 value in the denominator is an estimate of the voltage drop across the diode: () () in out 2 out pk out 2 1 overshoot v 0.5 v i i c l ? v ? + ? ? ? ? ? ? ? ? ? = d esign e xample : determine the v ripple where i pk equals 200ma, i out equals 12.8ma, l equals 47 h, c out equals 4.7 f, v in equals 3.0v, and v out equals 13.0v: () () mv 2 . 10 5 . 0 0 . 3 ma 8 . 12 ma 200 f 7 . 4 h 47 ? v droop ? ? ? ? ? ? ? ? ? ? = () () mv 4 . 18 0 . 3 0.5 0 . 13 ma 8 . 12 ma 200 f 4.7 h 47 ? v 2 2 1 overshoot ? ? + ? ? ? ? ? ? ? ? ? = therefore , v ripple = ? 10.2mv + 18.4mv + 10mv = 38.6mv d iode s election a schottky diode is recommended for most applications (e.g. microsemi ups5817). the low forward voltage drop and fast recovery time associat ed with this device supports the switching demands associated with this circuit topology. the designer is en couraged to consider the diode?s average and peak current ratings with respect to the application?s output and peak inductor current requirements. further, the diode?s reverse breakdown voltage characteristic must be capable of withstanding a negative voltage transition that is greater than v out . t ransistor s election the lx1992 can source up to 100ma of gate current. an n-channel mosfet with a relatively low threshold voltage, low gate charge and low r ds(on) is required to optimize overall circuit performance. the lxe1992 evaluation board uses a fairchild fdv303. this nmos device was chosen because it demonstrates an r ds_on of 0.33 ? and a total gate charge q g of 1.64nc (typ.) pcb l ayout the lx1992 produces high slew-rate voltage and current waveforms hence; the designer should take this into consideration when laying out the circuit. minimizing trace lengths from the ic to the inductor, transistor, diode, input and output capacitors, and feedback connection (i.e., pin 6) are typical considerations. mo reover, the designer should maximize the dc input and output trace widths to accommodate peak current leve ls associated with this topology. e valuation b oard the lxe1992 evaluation board is available from microsemi for assessing overall circuit performance. the evaluation board, shown in figure 3, is 3 by 3 inches (i.e., 7.6 by 7.6cm) square and programmed to drive 4 leds (provided). designers can easily modify circuit parameters to suit their particular application by replacing r cs (as described in this section) r set (i.e., r4) and diode load. moreover, the inductor, fet, and switching diode are easily swapped out to promote design verification of a circuit that maximizes efficiency and minimizes cost for a specific application. the evaluation board input and output connections are described in table 1. the dc input voltage is applied to vbat (not vcc) however the lx1992 ic may be driven from a separate dc source via the vcc input. the output current (i.e., led brightness) is controlled by adjusting the on-board potentiometer. the designer may elect to drive the brightness adjustment circuit from vbat or via a separate voltage source by selecting the appropriate jumper position (see table 2). optional external adjustment of the output led current is achieved by disengaging the potentiometer and applying either a dc volt age or a pwm-type signal to the vadj input. the pwm signal frequency should be higher than 150khz and contain a dc component les than 350mv. the lx1992 exhibits a low quiescent current (i q < 0.5 a: typ) during shutdown mode. the shdn pin is used to exercise the shutdown function on the evaluation board. this pin is pulled-up to vcc via a 10k ? resistor. grounding the shdn pin shuts down the ic (not the circuit output). the output voltage (i.e., voltage across the led string) is readily measured at the vout terminal and led current is derived from measuring the voltage at the vfdbk pin and dividing this value by 15 ? (i.e., r4). the factory installed component list for this must-have design tool is provided in table 3 and the schematic is shown in figure 4 a a p p p p l l i i c c a a t t i i o o n n
microsemi linfinity microelectronics division 11861 western avenue, garden grove, ca. 92841, 714-898-8121, fax: 714-893-2570 page 7 copyright ? 2000 rev. 1.1, 2002-11-21 www. microsemi . com lx1992 high efficiency led driver p roduction linfinity division application information (continued) figure 5: lxe1992 engineering evaluation board table 1: input and ouput pin assignments pin name allowable range description vbat 0 to 6v main power supply for output. (set external current limit to 0.5a) vcc 1.6v to 6v lx1992 power. may be strapped to vbat or use a separate supply if vcc jumper is in the sep position. do not power output from vcc pin on board.. vpot 1.6v to 6v potentiometer power. may be strapped to vbat or use a separate supply if vpot jumper is in the sep position. do not power output from vpot pin on board. vadj in 0 to 350mv apply a dc voltage or a pwm voltage to this pin to adjust the led current. pwm inputs should be greater than 120hz and dc portion less than 350mv. /shdn 0 to vcc pulled up to vcc on board (10k ? ), ground to inhibit the lx1992. vout 0 to 18v power supply output voltage that is applied to led string. vfdbk 0 to 400mv sense resistor voltage. divi de this voltage by 15 to determine led current. table 2: jumper pin position assignments jumper position functional description vcc/ bat use this position when powering vbat and vcc from the same supply. do not connect power to the vcc input when using this jumper position. vcc/ sep use this position when using a separ ate vcc supply (different from vbat). vpot/ vbat use this position when powering the potentiometer refer ence circuit from the vbat supply. do not connect power to the vcc input when using this jumper position. vpot/ sep use this position when using a separate power supply (different from vbat) to power the potentiometer reference circuit. this will lower the vbat current a nd provide a more accurate efficiency reading for the lx1992 circuit. adj/ pot use this position when using the potentiometer to adjust led current. adj/ ext use this position when adjusting the le d current with an external pwm that has a repetition rate >120hz. or when using a dc adjustment voltage. note: always put jumpers in one of the two possible positions a a p p p p l l i i c c a a t t i i o o n n
microsemi linfinity microelectronics division 11861 western avenue, garden grove, ca. 92841, 714-898-8121, fax: 714-893-2570 page 8 copyright ? 2000 rev. 1.1, 2002-11-21 www. microsemi . com lx1992 high efficiency led driver p roduction linfinity division application information (continued) table 3: factory installed component list for the lx1992 evaluation board quantity part reference description manufacturer part number 1 q1 mosfet, n-channel, 25v, sot23 type smt fairchild fdv303n 1 cr1 rectifier, schottky, 1a, 20v, powermite type smt microsemi ups5817 1 l1 inductor, 47uh, 540ma, smt toko a920cy-470 2 c1, c2 capacitor, ceramic x5r, 4.7uf, 25v, 1210 type smt taiyo yuden cetmk325bj475mn 2 c3, c4 capacitor, ceramic x7r, 0.1uf, 50v, 0805 type smt murata grm40x7r104m050 1 r4 resistor, 15 ohm, 1/10w, 0805 type smt panasonic erj6enf15r0 1 r5 resistor, 1k, 1/16w, 0603 type smt panasonic erj3ekf1001 1 r2 resistor, 4.02k, 1/16w, 0603 type smt panasonic erj3ekf4021 2 r3, r6 resistor, 100k, 1/16w, 0603 type smt panasonic erj3ekf1003 1 r1 resistor, 10k, 1/16w, 0603 type smt panasonic erj3ekf1002 1 r7 trimpot, 50k, 1/2w, through hole type bourns 3352e-1-503 1 vr1 ic, voltage reference, 1.25 volts, sot23 type smt microsemi lx432csc 1 vr2 diode, zener, 24v, 3w powermite type smt microsemi 1pmt5934b 4 led1 - 4 white led chicago miniature cmd333uwc 3 jb1 - jb3 header, 3 pos vertical type 3m 929647-09-36 3 jumper 3m 929955-06 note: the minimum set of parts needed to build a work ing power supply are: q1, cr1, l1, c2, c3, r2, r4, u1. vbat vadj vcc vpot gnd vcc shdn vadj vpot c1 4.7f 25v l1 47h cr1 ups5817 q1 fdv303n c2 4.7f 25v vr2 20v 1w 1pmt4114 cmd333uwc cmd333uwc cmd333uwc cmd333uwc vout vfdbk src gn d adj cs shdn fb ndrv in r2 4.02k r1 10k c3 0.1f 50v r3 100k c4 0.1f 25v r5 1k r6 100k r7 50k vr1 lx432 r4 15 ? figure 4 ? lxe1992 boost evaluation board schematic a a p p p p l l i i c c a a t t i i o o n n
microsemi linfinity microelectronics division 11861 western avenue, garden grove, ca. 92841, 714-898-8121, fax: 714-893-2570 page 9 copyright ? 2000 rev. 1.1, 2002-11-21 www. microsemi . com lx1992 high efficiency led driver p roduction linfinity division characteristic curves figure 5: v out and inductor current waveforms. channel 1: v out (ac coupled; 200mv/div) channel 2: inductor current (100ma/div.) configuration: v in = 3.0v, v out = 13.0v, i in = 65ma figure 6: v out and inductor current waveforms. channel 1: v out (ac coupled; 100mv/div) channel 2: inductor current (100ma/div.) configuration: v in = 3.0v, v out = 13.7v, i in = 120ma 0 1 2 3 4 5 0 20 40 60 80 100 120 140 160 driv e current (ma) drive voltage (v) figure 7: gate drive voltage vs. drive current at t = 25 o c. 50% 60% 70% 80% 90% 0 2 4 6 8 101214 1618 le d current (ma) efficiency figure 8: efficiency vs. led output current. configuration: v in = 3.0v, l = 47 h, r cs = 4k ? note: data taken from lxe1992 evaluation board 50% 60% 70% 80% 90% 100% 0 2 4 6 8 10 1214 1618 2022 24 le d current (ma) efficiency figure 9: efficiency vs. led output current. configuration: v in = 5.0v, l = 47 h, r cs = 4k ? note: data taken from lxe1992 evaluation board efficiency measurement hint : when doing an efficiency evaluation using the lx1992 ev aluation board, vpot should be driven by a separate voltage supply to account for losses associated with the onboard reference (i.e., the 1.25v shunt regulator and 1k ? resistor). this circuit will have vbat - 1.25v across it and at the higher input voltages the 1k ? resistor could have as much as 4ma through it. this shunt regulator circuitry will adversely effect the overall efficiency measurement and is not normall y used in an application. therefore it should not be considered when measuring efficiency. c c h h a a r r t t s s
microsemi linfinity microelectronics division 11861 western avenue, garden grove, ca. 92841, 714-898-8121, fax: 714-893-2570 page 10 copyright ? 2000 rev. 1.1, 2002-11-21 www. microsemi . com lx1992 high efficiency led driver p roduction linfinity division package dimensions du 8-pin miniature shrink outline package (msop) n l p k m b d g h c a m illimeters i nches dim min max min max a 2.85 3.05 .112 .120 b 2.90 3.10 .114 .122 c ? 1.10 ? 0.043 d 0.25 0.40 0.009 0.160 g 0.65 bsc 0.025 bsc h 0.38 0.64 0.015 0.025 j 0.13 0.18 0.005 0.007 k 0.95 bsc 0.037 bsc l 0.40 0.70 0.016 0.027 m 3 3 n 0.05 0.15 0.002 0.006 p 4.75 5.05 0.187 0.198 lm 8-pin plastic mlp-micro exposed pad e d e b a3 internally connected together, but isolated from all other terminals l2 l2 d2 e2 l a2 a a1 k m illimeters i nches dim min max min max a 0.80 1.00 0.031 0.039 a1 0.00 0.05 0.000 0.002 a2 0.65 0.75 0.025 0.029 a3 0.15 0.25 0.005 0.009 b 0.28 0.38 0.011 0.015 d 2.90 3.10 0.114 0.122 e 2.90 3.10 0.114 0.122 e 0.65 bsc 0.025 bsc d2 1.52 2.08 0.060 0.082 e2 1.02 1.31 0.040 0.052 k 0.20 * 0.008 * l 0.20 0.60 0.008 0.023 l2 0 0.13 0 0.005 0 12 0 12 note: 1. dimensions do not include mold flash or protrusions; these shall not exceed 0.155mm(.006?) on any side. lead dimension shall not include solder coverage. m m e e c c h h a a n n i i c c a a l l s s
microsemi linfinity microelectronics division 11861 western avenue, garden grove, ca. 92841, 714-898-8121, fax: 714-893-2570 page 11 copyright ? 2000 rev. 1.1, 2002-11-21 www. microsemi . com lx1992 high efficiency led driver p roduction linfinity division notes production data ? information contained in this document is proprietary to microsemi and is current as of publication date. this document may not be modified in any way without the express written consent of microsemi. product processing does not necessarily include testing of all parameters. microsemi reserves the right to change the configuration and performance of the product and to discontinue product at any time. n n o o t t e e s s

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