8-channel source driver with over-current protection providing over-current protection for each of its eight sourcing outputs, the udn2987a and udn2987lw drivers are used as an interface between standard low-level logic and relays, motors, sole- noids, leds, and incandescent lamps. the device includes thermal shutdown and output transient protection/clamp diodes for use with sustaining voltages to 35 v. in these drivers, each channel includes a latch to turn off that channel if the maximum channel current is exceeded. all channels are disabled if the thermal shutdown is activated. a common fault output is used to indicate either chip thermal shutdown or any over- current condition. all outputs are enabled by pulling the common oe/r input high. when oe/r is low, all outputs are inhibited and the eight latches are reset. under normal operating conditions, each of eight outputs will source in excess of 100 ma continuously at an ambient temperature of 25 c and a supply of 35 v. the over-current fault circuit will protect the device from short-circuits to ground with supply voltages of up to 35 v. the inputs are compatible with 5 v and 12 v logic systems?tl, schottky ttl, dtl, pmos, and cmos. in all cases, the output is switched on by an active high input level. the udn2987a is sup- plied in a 20-pin dual in-line plastic package; the udn2987lw is supplied in a 20-lead small-outline plastic package. features 350 ma output source current over-current protected internal ground clamp diodes output breakdown voltage 35 v, minimum ttl, dtl, pmos, or cmos compatible inputs internal thermal shutdown automotive capable data sheet 29310.4b* always order by complete part number: part number package udn2987a 20-pin dip udn2987lw 20-lead wide-body soic note that the udn2987a (dip) and the udn2987lw (soic) are electrically identical and share a common terminal number assignment. dwg. pp-067 v s 1 2 3 4 5 6 7 8 14 15 16 17 18 19 20 9 10 11 12 13 ground out in fault oe/r 1 oe n oe sense n ff x8 out 2 out 3 out 4 out 5 out 6 out 7 out 8 1 in 2 in 3 in 4 in 5 in 6 in 7 in 8 2987 absolute maximum ratings at t a = +25 c driver supply voltage, v s ..................... 35 v output sustaining voltage, v ce(sus) ...... 35 v continuous output current, i out ........................................ -500 ma* fault output voltage, v ce ................. 35 v fault output current, l c ................. 30 ma input voltage, v in .................................. 15 v package power dissipation, p d ........................................ see graph operating temperature range, t a ................................. -20 c to +85 c storage temperature range, t s ............................... -55 c to +150 c * outputs are disabled at approximately -500 ma per driver.
2987 8-channel source driver 115 northeast cutoff, box 15036 worcester, massachusetts 01615-0036 (508) 853-5000 2 functional block diagram output current waveshapes over-current fault sense dwg. no. a-13,293 dwg. no. a-13,292 dwg. no. a-13,286 phl 50 75 100 125 150 2.5 0.5 0 allowable package power dissipation in watts ambient temperature in c 2.0 1.5 1.0 25 dwg. gs-004b suffix 'lw', r = 90 c/w ja suffix 'a', r = 55 c/w ja copyright ?1987, 2003 allegro microsystems, inc. to fault latch
2987 8-channel source driver www.allegromicro.com 3 electrical characteristics at t a = 25 c, v oe = 2.4 v, v s = 35 v (unless otherwise noted). limits characteristic symbol test conditions min. typ. max. units functional supply range v s 7.0 35 v output leakage current i cex v in = 0.4 v* <-5.0 -200 a output sustaining voltage v out(sus) i out = -350 ma, l = 2.0 mh 35 v output saturation voltage v out(sat) v in = 2.4 v, i out = -100 ma 1.6 1.8 v v in = 2.4 v, i out = -225 ma 1.7 1.9 v v in = 2.4 v, i out = -350 ma 1.8 2.0 v channel shutdown threshold i m v in = 2.4 v -370 -500 ma fault leakage current i cex v cc = 35 v <1.0 100 a fault saturation voltage v ce(sat) i c = 30 ma 0.3 0.8 v input voltage v in(on) 2.4 v v in(off) 0.4 v input current i in(on) v in = 2.4 v 125 170 a v in = 5.0 v 840 1020 a v in = 12 v 1500 1800 a i in(off) v in = 0.4 v 15 a clamp diode leakage current i r v r = 35 v, t a = 70 c 50 a clamp diode forward voltage v f i f = 350 ma 1.5 1.8 v supply current i s(on) v in = 2.4 v*, outputs open 13 18 ma i s(off) v in = 0.4 v* 8.0 12 ma thermal shutdown t j 165 c thermal hysteresis ? t j ?5 c propagation delay time t plh r l = 100 ? 0.3 0.6 s t phl r l = 100 ? 2.0 4.0 s dead time t d 1.0 s *aii inputs simultaneously.
2987 8-channel source driver 115 northeast cutoff, box 15036 worcester, massachusetts 01615-0036 (508) 853-5000 4 applications information and circuit description as with all power integrated circuits, the udn2987a and udn2987lw have a maximum allowable output current rating. the 500 ma rating does not imply that operation at that value is permitted or even obtainable. the channel output current trip point is specified as -370 ma, minimum; therefore, attempted operation at current levels greater than -370 ma may cause a fault indication and channel shutdown. the device is tested at a maximum of -350 ma and that is the recommended maximum output current per driver. it provides protection for current overloads or shorted loads up to 35 v. all outputs are enabled by pulling the oe/r input high. when oe/r is low or allowed to float (internal pull- down), all outputs are inhibited and the latches are reset. note that the reset pulse duration (oe/r low) should be at least 1 s. this will ensure safe operation under attempted reset conditions with a shorted load. the latches are also reset during power up, regardless of the state of the oe/r input. the load current causes a small voltage drop across the internal low-value sense resistor. this voltage is compared to the voltage drop across a reference resistor with a constant current. the two resistors are matched to eliminate errors due to manufacturing tolerances or temperature effects. each channel includes a comparator and its own latch. an over-current fault (v sense > v ref ) will set the affected latch and shut down only that channel. all other channels will continue to operate normally. the latch includes a 1 s delay (t d ) to prevent unwanted triggering due to crossover currents generated when switching inductive loads. for an abrupt short circuit, the delay and output switching times will allow a brief, permissable current in excess of the trip current before the output driver is turned off. a common thermal shutdown disables all outputs if the chip temperature exceeds +165 c. at thermal shutdown, all latches are reset. the outputs are disabled until the chip cools down to about +150 c (thermal hysteresis). in the event of any channel over-current condition or chip thermal shutdown, the fault open-collector output is pulled low (turned on). allowable output current as a function of duty cycle (udn2987a shown, multiply by 78% for udn2987lw) at +25 c at +50 c
2987 8-channel source driver www.allegromicro.com 5 notes: 1. exact body and lead configuration at vendor? option within limits shown. 2. lead spacing tolerance is non-cumulative. 3. lead thickness is measured at seating plane or below. 4. shipped in sticks/tubes of 18 devices. dimensions in millimeters (for reference only) udn2987a dimensions in inches (controlling dimensions) 0.014 0.008 0.300 bsc dwg. ma-001-20 in 0.430 max 20 1 10 0.280 0.240 0.210 max 0.070 0.045 0.015 min 0.022 0.014 0.100 bsc 0.005 min 0.150 0.115 11 1.060 0.980 0.355 0.204 7.62 bsc dwg. ma-001-20 mm 10.92 max 20 1 10 7.11 6.10 5.33 max 1.77 1.15 0.39 min 0.558 0.356 2.54 bsc 0.13 min 3.81 2.93 11 26.92 24.89
2987 8-channel source driver 115 northeast cutoff, box 15036 worcester, massachusetts 01615-0036 (508) 853-5000 6 udn2987lw dimensions in inches (for reference only) dimensions in millimeters (controlling dimensions) 0 to 8 1 2 3 0.020 0.013 0.0040 min. 0.0125 0.0091 0.050 0.016 dwg. ma-008-20 in 0.050 bsc 20 11 0.2992 0.2914 0.419 0.394 0.5118 0.4961 0.0926 0.1043 notes: 1. exact body and lead configuration at vendor? option within limits shown. 2. lead spacing tolerance is non-cumulative. 3. shipped in sticks/tubes of 37 devices or add ?r?to part number for tape and reel. 0 to 8 1 20 2 3 0.51 0.33 0.10 min. dwg. ma-008-20 mm 1.27 bsc 11 0.32 0.23 1.27 0.40 7.60 7.40 10.65 10.00 13.00 12.60 2.65 2.35
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2987 8-channel source driver 115 northeast cutoff, box 15036 worcester, massachusetts 01615-0036 (508) 853-5000 8 power source drivers in order of 1) output current, 2) output voltage, 3) number of drivers output ratings * features serial latched diode saturated internal ma v # input drivers clamp outputs protection part number ? -25 60 8 C x C C C 5815 60 10 x x active pull-down C C 6810 60 12 x x active pull-down C C 5811 60 20 x x active pull-down C C 6812 60 32 x x active pull-down C C 6818 85 8 C C C C C 6118 -120 -25 8 C C x x C 2585 30 8 C C x x C 2985 50 8 x x x x C 5895 -350 35 8 C C x C x 2987 50 8 C C x C C 2981 and 2982 50 8 x x x C C 5891 80 8 C C x C C 2983 80 8 x x x C C 5890 -500 6 1 C C C mosfet x 2525 and 2535 6 2 C C C mosfet x 2535 and 2536 * current is maximum specified test condition, voltage is maximum rating. see specification for sustaining voltage limits or over-current protection voltage limits. ? complete part number includes additional characters to indicate operating temperature range and package style. the products described here are manufactured under one or more u.s. patents or u.s. patents pending. allegro microsystems, inc. reserves the right to make, from time to time, such departures from the detail specifications as may be required to permit improvements in the performance, reliability, or manufacturability of its products. before placing an order, the user is cautioned to verify that the information being relied upon is current. allegro products are not authorized for use as critical components in life-support devices or systems without express written approval. the information included herein is believed to be accurate and reliable. however, allegro microsystems, inc. assumes no responsibility for its use; nor for any infringe- ment of patents or other rights of third parties which may result from its use.
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