3953

3953 BRAKE REF RC GROUND GROUND LOGIC SUPPLY PHASE ENABLE 1 2 3 4 LOGIC 5 6 7 8 VBB VCC 12 11 10 9 GROUND SENSE OUTA LOAD SUPPLY VBB 16 15 14 13 LOAD SUPPLY OUTB MODE GROUND FULL-BRIDGE PWM MOTOR DRIVER Designed for bidirectional pulse-width modulated (PWM) current control of inductive loads, the A3953S— is capable of continuous output currents to ±1.3 A and operating voltages to 50 V. Internal fixed off-time PWM currentcontrol circuitry can be used to regulate the maximum load current to a desired value. The peak load current limit is set by the user’s selection of an input reference voltage and external sensing resistor. The fixed off-time pulse duration is set by a user- selected external RC timing network. Internal circuit protection includes thermal shutdown with hysteresis, transient-suppression diodes, and crossover current protection. Special power-up sequencing is not required. With the ENABLE input held low, the PHASE input controls load current polarity by selecting the appropriate source and sink driver pair. The MODE input determines whether the PWM current-control circuitry operates in a slow current-decay mode (only the selected source driver switching) or in a fast current-decay mode (selected source and sink switching). A userselectable blanking window prevents false triggering of the PWM currentcontrol circuitry. With the ENABLE input held high, all output drivers are disabled. A sleep mode is provided to reduce power consumption. When a logic low is applied to the BRAKE input, the braking function is enabled. This overrides ENABLE and PHASE to turn off both source drivers and turn on both sink drivers. The brake function can be used to dynamically brake brush dc motors. The A3953S— is supplied in a choice of two power packages; a 16-pin dual-in-line plastic package with copper heat-sink tabs, and a 16-lead plastic SOIC with copper heat-sink tabs. For both package styles, the power tab is at ground potential and needs no electrical isolation. Data Sheet 29319.8* Dwg. PP-056 Note the A3953SB (DIP) and the A3953SLB (SOIC) are electrically identical and share a common terminal number assignment. ABSOLUTE MAXIMUM RATINGS Load Supply Voltage, VBB . . . . . . . . . . 50 V Output Current, IOUT (Continuous) . . . . . . . . . . . . . . ±1.3 A* Logic Supply Voltage, VCC . . . . . . . . . 7.0 V Logic/Reference Input Voltage Range, VIN . . . . . . . . . . . -0.3 V to VCC + 0.3 V Sense Voltage, VSENSE (VCC = 5.0 V) . . . . . . . . . . . . . . . . 1.0 V (VCC = 3.3 V) . . . . . . . . . . . . . . . . 0.4 V Package Power Dissipation, PD . . . . . . . . . . . . . . . . . . . . See Graph Operating Temperature Range, TA . . . . . . . . . . . . . . . . . -20˚C to +85˚C Junction Temperature, TJ . . . . . . . +150˚C† Storage Temperature Range, TS . . . . . . . . . . . . . . . . -55˚C to +150˚C * Output current rating may be limited by duty cycle, ambient temperature, and heat sinking. Under any set of conditions, do not exceed the specified current rating or a junction temperature of 150˚C. † Fault conditions that produce excessive junction temperature will activate the device’s thermal shutdown circuitry. These conditions can be tolerated but should be avoided. FEATURES I I I I I I I ± 1.3 A Continuous Output Current 50 V Output Voltage Rating 3 V to 5.5 V Logic Supply Voltage Internal PWM Current Control Saturated Sink Drivers (Below 1 A) Fast and Slow Current-Decay Modes Automotive Capable I Sleep (Low Current Consumption) Mode I Internal TransientSuppression Diodes I Internal ThermalShutdown Circuitry I Crossover-Current and UVLO Protection Always order by complete part number: Part Number A3953SB A3953SLB Package 16-Pin DIP 16-Lead SOIC RθJA 43°C/W 67°C/W RθJT 6°C/W 6°C/W 3953 FULL-BRIDGE PWM MOTOR DRIVER FUNCTIONAL BLOCK DIAGRAM LOAD SUPPLY LOGIC SUPPLY 6 VCC SLEEP & STANDBY MODES 9 10 15 MODE 14 VBB PHASE 7 UVLO & TSD ENABLE 8 BRAKE 1 + PWM LATCH INPUT LOGIC LOAD SUPPLY 16 11 SENSE RS 12 13 GROUND Dwg. FP-036-2A OUTA Q BLANKING S RC 3 +– 2 REF RT CT VTH GROUND 4 5 VCC TRUTH TABLE BRAKE H H H H H H L L ENABLE H H L L L L X X PHASE X X H H L L X X MODE H L H L H L H L OUTA Off Off H H L L L L OUTB Off Off L L H H L L Sleep Mode Standby Forward, Fast Current-Decay Mode Forward, Slow Current-Decay Mode Reverse, Fast Current-Decay Mode Reverse, Slow Current-Decay Mode Brake, Fast Current-Decay Mode Brake, No Current Control DESCRIPTION X = Irrelevant 2 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 Copyright © 1995, 2000 Allegro MicroSystems, Inc. – R OUTB 3953 FULL-BRIDGE PWM MOTOR DRIVER ALLOWABLE PACKAGE POWER DISSIPATION IN WATTS 5 RθJT = 6.0°C/W 4 3 SUFFIX 'B', R θJA = 43°C/W 2 1 SUFFIX 'LB', R θJA = 63°C/W 0 25 50 75 100 TEMPERATURE IN °C 125 150 Dwg. GP-049-2A ELECTRICAL CHARACTERISTICS at TJ = 25˚C, VBB = 5 V to 50 V, VCC = 3.0 V to 5.5 V (unless otherwise noted.) Limits Characteristic Symbol Test Conditions Min. Typ. Max. Units Power Outputs Load Supply Voltage Range Output Leakage Current VBB ICEX Operating, IOUT = ±1.3 A, L = 3 mH VOUT = VBB VOUT = 0 V Sense Current Offset Output Saturation Voltage BRAKE = H (Forward/Reverse Mode) ISO VCE(SAT) ISENSE - IOUT1, IOUT = 850 mA, VSENSE = 0 V, VCC = 5 V VSENSE = 0.4 V, VCC = 3.0 V: Source Driver, IOUT = -0.85 A Source Driver, IOUT = -1.3 A Sink Driver, IOUT = 0.85 A Sink Driver, IOUT = 1.3 A Output Saturation Voltage BRAKE = L (Brake Mode) Clamp Diode Forward Voltage (Sink or Source) VF VCE(SAT) VSENSE = 0.4 V, VCC = 3.0 V: Sink Driver, IOUT = 0.85 A Sink Driver, IOUT = 1.3 A IF = 0.85 A IF = 1.3 A — — — — 1.0 1.3 1.2 1.4 1.2 1.5 1.4 1.6 V V V V — — — — 1.0 1.7 0.4 1.1 1.1 1.9 0.5 1.3 V V V V VCC — — 22 —