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A3966SLB Datasheet(PDF) 1 Page - Allegro MicroSystems |
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A3966SLB Datasheet(HTML) 1 Page - Allegro MicroSystems |
1 / 12 page 3966 DUAL FULL-BRIDGE PWM MOTOR DRIVER The A3966SA and A3966SLB are designed to drive both windings of a two-phase 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-fre- quency, 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 user-selectable blanking window that prevents false triggering of the PWM current-control 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 Allegro’s 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. A3966SLB OUT1B GROUND Dwg. PP-066-1 GROUND OUT1A PHASE 1 OUT2A SENSE1 ENABLE 1 LOAD SUPPLY REFERENCE PHASE 2 ENABLE 2 SENSE 2 OUT 2B LOGIC SUPPLY RC LOGIC LOGIC 1 2 3 14 15 16 6 710 11 89 RC 4 5 V REF 13 12 V BB V CC V BB FEATURES I ±650 mA Continuous Output Current I 30 V Output Voltage Rating I Internal Fixed-Frequency PWM Current Control I Satlington™ Sink Drivers I User-Selectable Blanking Window I Internal Ground-Clamp & Flyback Diodes I Internal Thermal-Shutdown Circuitry I Crossover-Current Protection and UVLO Protection Always order by complete part number: Part Number Package RθJA RθJC RθJT A3966SA 16-pin DIP 60 °C/W 38 °C/W — A3966SLB 16-lead batwing SOIC 67 °C/W — 6 °C/W 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 . |
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