Product category:
Power Supply ICs and Controllers
News Release from: Allegro MicroSystems Europe | Subject: A3948
Edited by the Electronicstalk Editorial
Team on 07 June 2002
PWM chip provides flexible DC motor
control
Designed for pulsewidth modulated current control of DC motors, the A3948 from Allegro MicroSystems can deliver a continuous output current up to +/-1.5 A and an operating voltage up to 50V.
Designed for pulsewidth modulated current control of DC motors, the A3948 from Allegro MicroSystems can deliver a continuous output current up to +/-1.5 A and an operating voltage up to 50V The new device features internal fixed-off-time PWM current-control timing circuitry that can be programmed via a serial interface to operate in slow, fast, and mixed current-decay modes
This article was originally published on Electronicstalk on 30 Aug 2000 at 8.00am (UK)
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'Phase' and 'enable' input terminals are provided for use in controlling the speed and direction of a DC motor with externally applied PWM-control signals.
The 'enable' input can be programmed via the serial port to pulsewidth-modulate the bridge in fast or slow current decay mode.
Internal synchronous rectification control circuitry is provided to reduce power dissipation during PWM operation.
Internal circuit protection includes thermal shutdown with hysteresis, and crossover-current protection.
Special power-up sequencing is not required.
The device is available in two package styles: a 24-pin dual-inline package with copper batwing tab, and a 24-lead SOIC surface-mount package with copper batwing tab.
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