Full Bridge Mosfet Driver

The A4957 is a full-bridge controller for use with external N-channel power MOSFETs and is specifically designed for applications with high-power inductive loads such as brush DC motors. A unique charge pump regulator provides full ( >10 V ) gate drive for battery voltages down to 7 V and allows the A4957 to operate with a reduced gate drive, down to 4.5 V. Gerb sledstvennogo komiteta rf vektor.

A bootstrap capacitor is used to provide the above battery supply voltage required for N-channel MOSFETs. A unique bootstrap charge management system ensures that the bootstrap capacitor is always sufficiently charged to supply the high-side gate drive circuit.

Each of the power MOSFETs is controlled independently but all are protected from shoot-through by dead time that is userconfigured by an external resistor. Integrated diagnostics provide indication of undervoltage and overtemperature faults. The A4957 is supplied in a 24-contact 4 mm × 4 mm × 0.75 mm QFN with an exposed pad for enhanced thermal dissipation. It is lead (Pb) free, with 100% matte tin leadframe plating (suffix –T).

The A3922 is an N-channel power MOSFET driver capable of controlling MOSFETs connected in a full-bridge (H-bridge) arrangement and is specifically designed for ASIL automotive applications with high-power inductive loads, such as brush DC motors, solenoids and actuators. Full ISO-26262 documentation is available to assist safety critical applications to achieve ASIL-D certification. A unique charge pump regulator provides a programmable gate drive voltage for battery voltages down to 7 V and allows the A3922 to operate with a reduced gate drive, down to 5.5 V. A bootstrap capacitor is used to provide the above-battery supply voltage required for N-channel MOSFETs.

The full bridge can be controlled by independent logic level inputs or through the SPI-compatible serial interface. The external power MOSFETs are protected from shoot-through by programmable dead time. Integrated diagnostics provide indication of multiple internal faults, system faults, and power bridge faults, and can be configured to protect the power MOSFETs under most short-circuit conditions.

See All Full/Half-Bridge MOSFET Drivers (17) Pricing Notes: This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. Dollars and subject to change. The A4957 is a full-bridge controller for use with external N-channel power MOSFETs and is specifically designed for applications with high-power inductive loads such as brush DC motors. A bootstrap capacitor is used to provide the above battery supply voltage required for N.

For safety-critical systems, the integrated diagnostic operation can be verified under control of the serial interface. In addition to providing full access to the bridge control, the serial interface is also used to alter programmable settings such as dead time, VDS threshold, and fault blank time. Detailed diagnostic information can be read through the serial interface. The A3922 is supplied in a 28-pin eTSSOP (suffix ‘LP’). This package is available in lead (Pb) free versions, with 100% matte-tin leadframe plating (suffix –T). ISO 26262 Certified Products have been designed in compliance to the ISO standard at the component level.

• Full-bridge MOSFET Driver • Bootstrap gate drive for N-channel MOSFET bridge • Cross-conduction protection with adjustable dead time • Charge pump for low supply voltage operation • Programmable gate drive voltage • 5.5 to 50 V supply voltage operating range • Integrated current sense amplifier • SPI compatible serial interface • Bridge control by direct logic inputs or serial interface • TTL-compatible logic inputs • Open-load detection • Extensive programmable diagnostics • Diagnostic verification • Safety-assist features.