A3966SLB-T

3966 A3966SLB (SOIC) DUAL FULL-BRIDGE PWM MOTOR DRIVER The A3966SA and A3966SLB are designed to drive both windings of a twophase bipolar stepper motor. Each device includes two H-bridges capable of continuous output currents of ±650 mA and operating voltages to 30 V. Motor winding current can be controlled by the internal fixed-frequency, pulse-width modulated (PWM), current-control circuitry. The peak load current limit is set by the user’s selection of a reference voltage and current-sensing resistors. Except for package style and pinout, the two devices are identical. The fixed-frequency pulse duration is set by a user-selected external RC timing network. The capacitor in the RC timing network also determines a userselectable blanking window that prevents false triggering of the PWM currentcontrol circuitry during switching transitions. To reduce on-chip power dissipation, the H-bridge power outputs have been optimized for low saturation voltages. The sink drivers feature the Allegro® patented Satlington® output structure. The Satlington outputs combine the low voltage drop of a saturated transistor and the high peak current capability of a Darlington. For each bridge, a PHASE input controls load-current polarity by selecting the appropriate source and sink driver pair. For each bridge, an ENABLE input, when held high, disables the output drivers. Special power-up sequencing is not required. Internal circuit protection includes thermal shutdown with hysteresis, ground-clamp and flyback diodes, and crossover-current protection. The A3966SA is supplied in a 16-pin dual in-line plastic package. The A3966SLB is supplied in a 16-lead plastic SOIC with copper heat sink tabs. The power tab is at ground potential and needs no electrical isolation. The A3966SLB is also available in a lead (Pb) free version, with 100% matte tin leadframe plating. Data Sheet 29319.25G OUT1A PHASE 1 ENABLE 1 GROUND SENSE1 OUT 1B LOAD SUPPLY REFERENCE 1 2 3 4 5 6 V 7 8 V REF BB 16 V BB 15 14 LOGIC LOGIC 13 12 11 VCC RC 10 9 OUT 2A PHASE 2 ENABLE 2 GROUND SENSE 2 OUT 2B LOGIC SUPPLY RC Dwg. PP-066-1 ABSOLUTE MAXIMUM RATINGS Load Supply Voltage, VBB ...................... 30 V Output Current, IOUT (peak) ........... ±750 mA (continuous) .............................. ±650 mA Logic Supply Voltage, VCC .................... 7.0 V Input Voltage, Vin ........ -0.3 V to VCC + 0.3 V Sense Voltage, VS ................................ 1.0 V Package Power Dissipation (TA = 25°C), PD A3966SA ..................................... 2.08 W* A3966SLB ................................... 1.87 W* 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. * Per SEMI G42-88 Specification, Thermal Test Board Standardization for Measuring Junction-to-Ambient Thermal Resistance of Semiconductor Packages. FEATURES ■ ■ ■ ■ ■ ■ ■ ■ ±650 mA Continuous Output Current 30 V Output Voltage Rating Internal Fixed-Frequency PWM Current Control Satlington Sink Drivers User-Selectable Blanking Window Internal Ground-Clamp & Flyback Diodes Internal Thermal-Shutdown Circuitry Crossover-Current Protection and UVLO Protection P a rt N um b e r A 3 9 6 6 S L B -T A 3 9 6 6 S L B T R -T * P b -fre e * Ye s Ye s P ackage 1 6 -L e a d S O IC 1 6 -L e a d S O IC P a c k ing 4 7 p e r tub e 1 0 0 0 p e r re e l Pb-based variants are being phased out of the product line. The variants cited in this footnote are in production but have been determined to be LAST TIME BUY. This classification indicates that sale of this device is currently restricted to existing customer applications. The variants should not be purchased for new design applications because obsolescence in the near future is probable. Samples are no longer available. Status change: October 31, 2006. Deadline for receipt fo LAST TIME BUY orders: April 27, 2007. These variants include: A3966SA, A3966SLB, and A3966SLBTR. 3966 DUAL FULL-BRIDGE PWM MOTOR DRIVER FUNCTIONAL BLOCK DIAGRAM OUT 1A OUT 1B V CC PHASE 1 V BB PHASE 2 + LOGIC SUPPLY OUT 2A OUT 2B LOAD SUPPLY UVLO & TSD CONTROL LOGIC1 CONTROL LOGIC2 UVLO & TSD ENABLE 1 SOURCE ENABLE 1 ENABLE 2 CURRENT-SENSE COMPARATOR 1 SENSE 1 SENSE 2 CURRENT-SENSE COMPARATOR 2 PWM LATCH 1 R Q S BLANKING GATE 1 + – + – BLANKING GATE 2 PWM LATCH 2 R Q S ÷4 OSC RC R1S R 2S SOURCE ENABLE 2 GROUND RT CT REFERENCE Dwg. FP-036-6 A3966SA (DIP) SENSE 1 OUT 1B LOAD SUPPLY REFERENCE RC LOGIC SUPPLY OUT 2B SENSE 2 1 LOGIC TRUTH TABLE 16 15 14 ENABLE 1 PHASE 1 OUT 1A GROUND GROUND OUT 2A PHASE 2 ENABLE 2 2 3 4 5 6 7 8 V REF RC V PHASE X H L ENABLE H L L OUTA Off H L OUTB Off L H V BB 13 12 11 X = Irrelevant CC LOGIC 10 9 Dwg. PP-066-2 2 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 Copyright © 1998, 2003 Allegro MicroSystems, Inc. 3966 DUAL FULL-BRIDGE PWM MOTOR DRIVER ELECTRICAL CHARACTERISTICS at TA = +25°C, VBB = 30 V, VCC = 4.75 V to 5.5 V, VREF = 2 V, VS = 0 V, 56 kΩ & 680 pF RC to Ground (unless noted otherwise) Limits Characteristic Output Drivers Load Supply Voltage Range Output Leakage Current Output Saturation Voltage V BB I CEX VCE(SAT) Operating, IOUT = ±650 mA, L = 3 mH VOUT = 30 V VOUT = 0 V Source Driver, IOUT = -400 mA Source Driver, IOUT = -650 mA Sink Driver, IOUT = +400 mA, VS = 0.5 V Sink Driver, IOUT = +650 mA, VS = 0.5 V Clamp Diode Forward Voltage Motor Supply Current (No Load) VF IBB(ON) IBB(OFF) IF = 4 0 0 m A IF = 6 5 0 m A VENABLE1 = VENABLE2 = 0.8 V VENABLE1 = VENABLE2 = 2.4 V V CC — — — — — — — — — — —