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A3952SB Datasheet(PDF) 1 Page - Allegro MicroSystems |
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A3952SB Datasheet(HTML) 1 Page - Allegro MicroSystems |
1 / 16 page FULL-BRIDGE PWM MOTOR DRIVER Designed for bidirectional pulse-width modulated current control of inductive loads, the A3952S– is capable of continuous output currents to ±2 A and operating voltages to 50 V. Internal fixed off-time PWM current-control 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 sink driver switching) or in a fast current-decay mode (selected source and sink switching). A user-selectable blanking window prevents false triggering of the PWM current control circuitry. With the ENABLE input held high, all output drivers are disabled. A sleep mode is provided to reduce power consumption when inactive. 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 safely used to dynamically brake brush dc motors. The A3952S– is supplied in a choice of four power packages. In all package styles, the batwing/power tab is at ground potential and needs no isolation. These devices are also available for operation from -40 °C to +125 °C. To order, change the suffix from 'S–' to 'K–'. FEATURES s ±2 A Continuous Output Current Rating s 50 V Output Voltage Rating s Internal PWM Current Control s Fast and Slow Current-Decay Modes s Sleep (Low Current Consumption) Mode s Internal Transient Suppression Diodes s Under-Voltage Lockout s Internal Thermal Shutdown Circuitry s Crossover-Current Protection Always order by complete part number: Part Number Package RθJA RθJT A3952SB 16-Pin DIP 43 °C/W 6.0 °C/W A3952SEB 28-Lead PLCC 42 °C/W 6.0 °C/W A3952SLB 16-Lead SOIC 67 °C/W 6.0 °C/W A3952SW 12-Pin Power-Tab SIP 36 °C/W 2.0 °C/W A3952SB Note that the A3952SB (DIP) and the A3952SLB (SOIC) are electrically identical and share a common terminal number assignment. ABSOLUTE MAXIMUM RATINGS Load Supply Voltage, V BB .................. 50 V Output Current, I OUT (t w ≤ 20 µs) .................................. ±3.5 A (Continuous) ............................... ±2.0 A Logic Supply Voltage, V CC ................. 7.0 V Logic Input Voltage Range, V IN ....................... -0.3 V to VCC + 0.3 V Sense Voltage, V SENSE ...................... 1.5 V Reference Voltage, V REF .................... 15 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 limited by duty cycle, ambient temperature, heat sinking and/or forced cooling. 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 device thermal shutdown circuitry. These conditions can be tolerated but should be avoided. 3952 MODE GROUND GROUND LOGIC SUPPLY PHASE GROUND GROUND RC SENSE LOAD SUPPLY Dwg. PP-056 BRAKE REF LOAD SUPPLY VCC OUTB OUTA VBB VBB LOGIC ENABLE 1 2 3 4 5 6 7 89 10 11 12 13 14 15 16 |
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