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3962 Datasheet(PDF) 1 Page - Allegro MicroSystems |
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3962 Datasheet(HTML) 1 Page - Allegro MicroSystems |
1 / 8 page 3962 DUAL FULL-BRIDGE PWM MOTOR DRIVER DISCONTINUED PRODUCT FOR REFERENCE ONL Y — See A3964SLB DUAL FULL-BRIDGE PWM MOTOR DRIVER Always order by complete part number: A3962SLB . ABSOLUTE MAXIMUM RATINGS Load Supply Voltage, VBB . . . . . . . . . 30 V Output Current, IOUT . . . . . . . . . . ±800 mA* Logic Supply Voltage, VCC . . . . . . . . . 7.0 V Logic Input Voltage Range, VIN . . . . . . . . . . . -0.3 V to VCC + 0.3 V Sense Voltage, VSENSE . . . . . . . . . . . . 1.0 V Reference Output Current, IREF OUT . . . . . . . . . . . . . . . . . . . 1.0 mA 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 tempera ture 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. Designed for pulse-width modulated (PWM) current control of bipolar stepper motors, the A3962SLB is capable of continuous output currents to ±800 mA and operating voltages to 30 V. Internal fixed off-time PWM current-control circuitry can be used to regulate the maximum load current to a desired value. An internal precision voltage reference is provided to improve motor peak-current control accuracy. The peak load current limit is set by the user’s selection of an external resistor divider and current-sensing resistors. The fixed off-time pulse duration is set by user-selected external RC timing networks. 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 transi- tions. This eliminates the need for two external RC filter networks on the current-sensing comparator inputs. For each bridge the PHASE input controls load current polarity by selecting the appropriate source and sink driver pair. For each bridge the ENABLE input, when held high, disables the output drivers. Spe- cial power-up sequencing is not required. Internal circuit protection includes thermal shutdown with hysteresis, transient-suppression diodes, and crossover-current protection. The A3962SLB is supplied in a 20-lead plastic SOIC with copper heat sink tabs. The power tab is at ground potential and needs no electrical isolation. FEATURES s ±800 mA Continuous Output Current Rating s 30 V Output Voltage Rating s Internal PWM Current Control, Saturated Sink Drivers s Internally Generated Precision 2.5 V Reference s Internal Transient-Suppression Diodes s Internal Thermal-Shutdown Circuitry s Crossover-Current Protection, UVLO Protection s Automotive Capable 3962 1 VBB 2 1 2 3 4 5 6 7 9 20 19 18 17 16 15 14 13 12 11 10 9 8 θ 2 θ 1 V CC GROUND GROUND GROUND GROUND PHASE 2 V REF(OUT) 2 RC 1 RC V REF(IN) PHASE 1 2B OUT SENSE 2 2A OUT 1A OUT SENSE 1 1B OUT LOAD SUPPLY LOGIC SUPPLY Dwg. PP-047-1 ENABLE 1 ENABLE 2 |
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Descripción similar - 3962 |
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