discontinued product for reference onl y. the UDN2961B and udn2961w are 3.4 a half bridges designed specifically for driving solenoid printheads, stepper motors, and dc motors. the UDN2961B/w consists of a power source driver output, a power sink driver output, a flyback recovery diode, internal current sensing circuitry, and a user-selectable fixed off-time chopper circuit. the output drivers are capable of sustaining 45 v with continuous currents of 3.4 a and peak transient currents of 4 a permitted. the outputs have been optimized for a low output saturation voltage (typically 2.6 v total source plus sink drops at 3.4 a). for output current control, load current is sensed internally and limited by chopping the output driver(s) in a user-selectable fixed off- time pwm mode. the maximum output current is determined by the user? selection of a reference voltage. the mode pin determines whether the current control circuitry will chop in a slow current-decay mode (only the source driver switching) or in a fast current-decay mode (source and sink switching). a user-selectable blanking window prevents false triggering of the current control circuitry during chopping. the UDN2961B is supplied in a 16-pin dual in-line plastic batwing package with a copper lead-frame and heat sinkable tabs for improved power dissipation capabilities. for higher power dissipation require- ments, the udn2961w is supplied in a 12-pin single in-line power tab package. features 3.4 a, 45 v source and sink drivers internal current sensing user-selectable fixed off-time pwm current control internal flyback diode low output saturation voltage chip enable fast or slow current-decay modes programmable blanking window internal thermal shutdown circuitry UDN2961B high-current half-bridge printhead/motor driver?ith internal current sensing and control absolute maximum ratings supply voltage, v bb . . . . . . . . . . . . . . 45 v output current, i out (continuous) . 3.4 a (t w 20 s, 10% duty cycle) . . 4.0 a logic supply voltage, v cc . . . . . . . . . 7.0 v input voltage range, v in . . . . . . . . . . . . . . . -0.3 v to +7.0 v package power dissipation, p d . . . . . . . . . . . . . . . . . . . see graph operating temperature range, t a . . . . . . . . . . . . . . . . -20 c to +85 c junction temperature, t j . . . . . . . +150 c* storage temperature range, t s . . . . . . . . . . . . . . . - 55 c to +150 c output current rating may be restricted to a value determined by system concerns and factors. these include: system duty cycle and timing, ambient temperature, and use of any heatsinking and/or forced cooling. for reliable operation, the specified maximum junction temperature should not be exceeded. * fault conditions that produce excessive junction temperature will activate device thermal shutdown circuitry. these conditions can be tolerated, but should be avoided. always order by complete part number: part number package UDN2961B 16-pin dip udn2961w 12-pin power-tab sip 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 v source out emitter sink out nc ground ground cc in enable rc mode ground ground v ref v bb input current- control logic v load supply logic supply bb dwg. pp-035 data sheet 29318.16* 2961
2961 high-current half-bridge printhead/motor driver 115 northeast cutoff, box 15036 worcester, massachusetts 01615-0036 (508) 853-5000 functional block diagram 50 75 100 125 150 10 6 4 2 0 temperature in c 8 25 dwg. gp-032a suffix 'b', r = 43 c/w ja suffix 'w', r = 38 c/w ja suffix 'w', r = 2.0 c/w jt suffix 'b', r = 6.0 c/w jt allowable package power dissipation in watts udn2961w 2940 ? tsd r s low trip rc source out emitter sink out enable input mode ground r c q flip- flop ref circuit v ref cc v +5 v bb v v sense bb v + - r cv one shot dw g . fp-019a 1 2 3 4 5 6 7 8 9 10 11 12 emitter input enable rc mode source out ground sink out v bb v cc current- control logic logic supply load supply v bb v ref r cv dw g . pp-036 copyright ? 1995, 1996 allegro microsystems, inc.
2961 high-current half-bridge printhead/motor driver www.allegromicro.com limits characteristic symbol test conditions min. typ. max. units output drivers output leakage current i cex v en = 0.8 v, v source = 0 v <-1.0 -100 a v en = 0.8 v, v sink = 45 v <1.0 100 a output saturation voltage v ce(sat) source driver, i out = -3.4 a 1.6 2.2 v source driver, i out = -3.0 a 1.5 v sink driver, i out = 3.4 a 1.0 1.4 v sink driver, i out = 3.0 a 0.9 v output sustaining voltage v ce(sus) i out = 3.4 a, l = 3 mh 45 v recovery diode leakage current i r v r = 45 v <1.0 100 a recovery diode forward voltage v f i f = 3.4 a 2.0 v motor supply current i bb(on) v en = 2.0 v, v in = 0.8 v, no load 70 ma i bb(off) v en = 0.8 v 2.5 ma output rise time t r source driver, i out = -3.4 a 600 ns sink driver, i out = 3.4 a 600 ns output fall time t f source driver, i out = -3.4 a 600 ns sink driver, i out = 3.4 a 600 ns control logic logic input voltage v in(1) 2.0 v v in(0) 0.8 v logic input current i in(1) v in = 5.0 v 10 a i in(0) v in = 0 v -1.0 ma reference input current i ref v ref = 5.0 v 50 a transconductance i trip /v ref v ref = 1.0 v 0.9 1.0 1.1 a/v v ref = 3.2 v 0.9 1.0 1.1 a/v logic supply current i cc v en = 2.0 v, v in = 0.8 v, no load 160 ma v en = 0.8 v 15 ma turn on delay t pd(on) source driver 600 ns sink driver 600 ns turn off delay t pd(off) source driver 2.0 s sink driver 2.0 s thermal shutdown temperature t j 165 c negative current is defined as coming out of (sourcing) the specified device terminal. electrical characteristics at t a = +25 c, v bb = 45 v, v cc = 4.75 v to 5.25 v, r cv = 2940 ? (unless otherwise noted).
2961 high-current half-bridge printhead/motor driver 115 northeast cutoff, box 15036 worcester, massachusetts 01615-0036 (508) 853-5000 bb v v sense + - ref circuit bb v dw g . ep-037 drive current recirculation (slow-decay mode) recirculation (fast-decay mode) applications information the UDN2961B/w is a high current half-bridge designed to drive a number of inductive loads such as printer solenoids, stepper motors, and dc motors. load current is sensed internally and is controlled by pulse-width modulating (pwm) the output driver(s) in a fixed off-time, variable- frequency format. the peak current level is set by the user s selection of a reference voltage. a slow current-decay mode (chopping only the source driver) or a fast current-decay mode (chopping both the source and sink drivers) can be selected via the mode pin. pwm current control a logic low on the mode pin sets the current-control circuitry into the slow-decay mode. the rs flip-flop is set initially, and both the source driver and the sink driver are turned on when the input pin is at a logic low. as current in the load increases, it is sensed by the internal sense resistor until the sense voltage equals the trip voltage of the comparator. at this time, the flip-flop is reset and the source driver is turned off. over the range of v ref = 0.8 v to 3.4 v, the output current trip point transfer function is a direct linear function of the reference voltage: i trip = v ref to ensure an accurate chop current level ( 10%), an external 2940 ? 1% resistor (r cv ) is used. the actual load current peak will be slightly higher than the trip point (especially for low-inductance loads) because of the internal logic and switching delays (typically 1.5 s). after the source driver turns off, the load current decays, circulating through an external ground clamp diode, the load, and the sink transistor. the source driver s off time (and therefore the magni- tude of the current decrease) is determined by the one-shot s external rc timing compo- nents: t off = rc within the range of 20 k ? to 100 k ? and 100 pf to 1000 pf. when the one-shot times out, the flip-flop is set again, the source driver is re- enabled, and the load current again is allowed to rise to the set peak value and trip the comparator. this cycle repeats itself, maintaining the average load current at the desired level. enable input mode load current rc rc/2 i trip dw g . wp-015
2961 high-current half-bridge printhead/motor driver www.allegromicro.com a logic high on the mode pin sets the current-control circuitry into the fast-decay mode. when the peak current threshold is detected, the flip-flop is reset and both the source driver and the sink driver turn off. load current decays quickly through the external ground clamp diode, the load, and the internal flyback diode. in the fast- decay mode, the off time period is one- half the time that is set by the external rc network for the slow-decay mode: t off = the amount of ripple current, when chopping in the fast-decay mode, is considerably higher than when chopping in the slow-decay mode. the frequency of the pwm current control is determined by the time required for the load current to reach the set peak threshold (a function of the load character- istics and v bb ) plus the off time of the switching driver(s) (set by the external rc components). to prevent false resetting of the flip- flop, due to switching transients and noise, a blanking time for the comparator can be set by the user where t b 3600 x c in the slow-decay mode or t b 2400 x c in the fast-decay mode. for c between 100 pf and 1000 pf, t b is in s. power considerations the UDN2961B/w outputs are opti- mized for low power dissipation. the sink driver has a maximum saturation voltage drop of only 1.4 v at 3.4 a, while the source driver has a 2.2 v drop at -3.4 a. device power dissipation is minimized in the slow-decay mode, as the chopping driver (the source driver) is on for less than 50% of the chop period. when the source driver is off during a chop cycle, power is dissipated on chip only by the sink driver; the rest of the power is dissipated through the external ground clamp diode. in the fast-decay mode, the on time of the chopping drivers (both the source driver and the sink driver) may be greater than 50%, and the power dissipa- tion will be greater. general a logic low on the enable pin prevents the source driver and the sink driver from turning on, regardless of the state of the input pin or the supply voltages. with the enable pin high, a logic low on the input pin turns on the output drivers. to protect against inductive load voltage transients, an external ground clamp diode is required. a fast-recovery diode is recom- mended to reduce power dissipation in the UDN2961B/w. the blank- ing time prevents false triggering of the current sense comparator, which can be caused by the recovery current spike of the ground clamp diode when the chopping source driver turns on. rc 2 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 v cc v bb current- control logic 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 v cc current- control logic 2940 ? 1% v ref input enable mode v bb v bb v bb r c r c dw g . ep-038a +5 v +5 v input 47 f 47 f 2940 ? 1% bb v bb v
2961 high-current half-bridge printhead/motor driver 115 northeast cutoff, box 15036 worcester, massachusetts 01615-0036 (508) 853-5000 the load supply (v bb ) should be well decoupled with a capacitor placed as close as possible to the device. the emitter pin should be connected to a high-current power ground. thermal shutdown protection circuitry is activated and turns off both output drivers at a junction temperature of typically +165 c. it is intended only to protect the device from catastrophic failures due to excessive junction temperatures and should not imply that output short circuits are permitted. the output drivers are re-enabled when the junction temperature cools down to approximately +145 c. motor driver applications two UDN2961B/ws can be cross connected as shown to form a full-bridge driver circuit. two full-bridge circuits are needed to drive a two-phase bipolar stepper motor. when in a full-bridge configuration, one input signal must be logically inverted from the other input signal to prevent the simultaneous conduction of a source driver from one half-bridge and the sink driver from the other half-bridge. in order to prevent crossover currents, a turn-on delay time of 3 s is needed between the time an input signal for one of the half bridges goes high and the input signal for the other half bridge goes low. in addition to the two external ground clamp diodes, diodes in series with the load to the sink out are needed in a full-bridge configuration. these series diodes prevent the sink drivers from conducting on the inverse mode, which can occur when the opposite half-bridge ground clamp diode is conducting and forces the sink driver collector below ground. if fast current decay is used (mode = logic high) or pulse width modulation of the load-current direction is used, diodes in series with the load to the source out are needed. these series diodes prevent the source out from inverse conducting during the recircu- lation period and thereby prevent shoot-through currents from occuring as the drivers turn back on.
2961 high-current half-bridge printhead/motor driver www.allegromicro.com UDN2961B dimensions in inches (controlling dimensions) dimensions in millimeters (for reference only) notes: 1. exact body and lead configuration at vendor s option within limits shown. 2. lead spacing tolerance is non-cumulative 3. lead thickness is measured at seating plane or below. 4. webbed lead frame. leads 4, 5, 12, and 13 are internally one piece. 0.508 0.204 7.62 bsc dwg. ma-001-17a mm 10.92 max 16 1 8 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 9 19.68 18.67 note 4 0.020 0.008 0.300 bsc dwg. ma-001-17a in 0.430 max 16 1 8 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 9 0.775 0.735 note 4
2961 high-current half-bridge printhead/motor driver 115 northeast cutoff, box 15036 worcester, massachusetts 01615-0036 (508) 853-5000 udn2961w dimensions in inches (controlling dimensions) notes: 1. lead thickness is measured at seating plane or below. 2. lead spacing tolerance is non-cumulative 3. exact body and lead configuration at vendor s option within limits shown. 4. lead gauge plane is 0.030 below seating plane. dwg. mp-007 in 1.260 1.240 0.775 0.765 0.020 0.155 0.145 0.180 max 0.055 0.045 0.135 0.100 0.290 min 0.080 0.070 0.365 0.100 0.010 0.030 0.020 0.065 0.035 1 0.023 0.018 0.140 0.570 0.540 0.245 0.225 12 index area
2961 high-current half-bridge printhead/motor driver www.allegromicro.com udn2961w dimensions in millimeters (for reference only) notes: 1. lead thickness is measured at seating plane or below. 2. lead spacing tolerance is non-cumulative 3. exact body and lead configuration at vendor s option within limits shown. 4. lead gauge plane is 0.762 mm below seating plane. dwg. mp-007 mm 32.00 31.49 19.69 19.45 0.51 3.94 3.68 4.57 max 1.40 1.14 3.43 2.54 7.36 min 2.03 1.77 9.27 2.54 0.254 0.76 0.51 1.65 0.89 1 0.59 0.45 3.56 14.48 13.71 6.22 5.71 12 index area
2961 high-current half-bridge printhead/motor driver 115 northeast cutoff, box 15036 worcester, massachusetts 01615-0036 (508) 853-5000 motor drivers function output ratings* part number ? integrated circuits for brushless dc motors 3-phase power mosfet controller 28 v 3933 3-phase power mosfet controller 40 v 3935 3-phase power mosfet controller 50 v 3932 & 3938 3-phase back-emf controller/driver 900 ma 14 v 8904 3-phase pwm current-controlled dmos driver 3.0 a 50 v 3936 integrated bridge drivers for dc and bipolar stepper motors pwm current-controlled dual full bridge 500 ma 18 v 3965 dual full bridge with protection & diagnostics 500 ma 30 v 3976 pwm current-controlled dual full bridge 650 ma 30 v 3966 pwm current-controlled dual full bridge 650 ma 30 v 3968 microstepping translator/dual full bridge 750 ma 30 v 3967 pwm current-controlled dual full bridge 750 ma 45 v 2916 pwm current-controlled dual full bridge 750 ma 45 v 2919 pwm current-controlled dual full bridge 750 ma 45 v 6219 pwm current-controlled dual full bridge 800 ma 33 v 3964 pwm current-controlled dual dmos full bridge 1.0 a 35 v 3973 pwm current-controlled full bridge 1.3 a 50 v 3953 pwm current-controlled dual full bridge 1.5 a 45 v 2917 pwm current-controlled dmos full bridge 1.5 a 50 v 3948 pwm current-controlled microstepping full bridge 1.5 a 50 v 3955 pwm current-controlled microstepping full bridge 1.5 a 50 v 3957 pwm current-controlled dual dmos full bridge 1.5 a 50 v 3972 pwm current-controlled dual dmos full bridge 1.5 a 50 v 3974 pwm current-controlled full bridge 2.0 a 50 v 3952 pwm current-controlled dmos full bridge 2.0 a 50 v 3958 microstepping translator/dual dmos full bridge 2.5 a 35 v 3977 pwm current-controlled dmos full bridge 3.0 a 50 v 3959 unipolar stepper motor & other drivers unipolar stepper-motor translator/driver 1.0 a 46 v 7050 unipolar stepper-motor translator/driver 1.25 a 50 v 5804 unipolar stepper-motor quad drivers 1.5 a 46 v 7024 & 7029 unipolar microstepper-motor quad driver 1.5 a 46 v 7042 unipolar stepper-motor quad driver 1.8 a 50 v 2540 unipolar stepper-motor translator/driver 2.0 a 46 v 7051 unipolar stepper-motor quad driver 3.0 a 46 v 7026 unipolar microstepper-motor quad driver 3.0 a 46 v 7044 unipolar stepper-motor translator/driver 3.0 a 46 v 7052 * current is maximum specified test condition, voltage is maximum rating. see specification for sustaining voltage limits or over-current protection voltage limits. negative current is defined as coming out of (sourcing) the output. ? complete part number includes additional characters to indicate operating temperature range and package style. also, see 3175, 3177, 3235, and 3275 hall-effect sensors for use with brushless dc motors.
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