Product category:
Power Supply ICs and Controllers
News Release from: Allegro MicroSystems Europe | Subject: A3940
Edited by the Electronicstalk Editorial
Team on 30 July 2003
High-power DC motor driver for
automotive uses
The A3940 H-bridge power MOSFET controller is designed specifically for driving high-power DC motors in automotive applications.
The A3940 H-bridge power mosfet controller from Allegro MicroSystems is designed specifically for driving high-power DC motors in automotive applications The new device incorporates four high-current gate-drive outputs capable of driving a wide range of power N-channel mosfets
This article was originally published on Electronicstalk on 9 Aug 2006 at 8.00am (UK)
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It will operate with load supply voltages from -0.6 to +40V, and has a logic input/output voltage range of -0.3 to +6.5V.
Phase and enable input terminals are provided for controlling the speed and direction of a DC motor with externally applied PWM (pulsewidth-modulated) control signals.
Bootstrap capacitors are used to provide the above-battery-supply voltage required for N-channel FETs.
An internal charge pump for the high side will allow for DC (100% duty cycle) operation of the bridge.
Protection features include supply undervoltage and overvoltage, programmable dead-time adjustment for crossconduction protection, thermal shutdown, and motor lead short-to-supply and short-to-ground protection.
The A3940 is available in a 28-pin low-profile (1mm) e-TSSOP package which has an exposed pad that is solderable to PCB layers for improved thermal and electrical performance, as well as the wide-bodied SOIC (LW) package.
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