A3952SB Full-Bridge PWM Motor Driver - (AD42654)

Description:

Designed for pulse width modulated bidirectional current control of inductive loads, the A3952S– is capable of continuous output currents to ±2 A and operating voltages to 50 V. Internal PWM current control circuitry with fixed off-time provides regulation of 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 an external sense 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. A special power-up sequencing is not required. With the ENABLE input held low, the PHASE input controls the polarity of the load current by selecting the appropriate source-sink driver pair. The MODE input determines if the PWM current control circuitry operates in a slow current-decay mode (only the selected sink driver is switched) or in a fast current-decay mode (both the selected source and sink drivers are switched). A user-selectable blanking window prevents incorrect activation 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 the device is idle. Applying a logic low to the BRAKE input activates the braking function. This overrides ENABLE and PHASE to disable both source drivers and enable both sink drivers. The braking function can be safely used to dynamically brake brush DC motors. The A3952S– is supplied in four power packages. In all package types, the Batwing/Power tab is at ground and does not require isolation. These devices are also available for operation from –40 °C to +125 °C. To order, change the suffix from “S–” to “K–”.

Features:

- Rated ±2 A continuous output current

- 50 V output voltage rating

- Internal PWM current control

- Fast and slow current-decay modes

- Sleep mode (low current consumption)

- Internal transient-suppression diodes

- Under-voltage lockout

- Internal thermal shutdown circuitry

- Crossover-current protection

Datasheet