Freescale Semi

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  • Programmable H-Bridge Power IC

  • Created: Aug 09, 2015

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The Freescale’s MC33899VW programmable H-bridge power integrated circuit is designed to drive a DC motor in both forward and reverse rotation under pulse width modulation control. It has synchronous rectification control of the high side MOSFETs and has the ability to control both an SPI-selectable slew rate and current limit that is needed for performance and noise suppression.

In the circuit, the VIGNP is the primary power input for the H-Bridge that ranges from 0V to 26.5 V. The S1 and S0 outputs drive the bi-directional DC motor where each output has two internal N-channel MOSFETs connected in a half-bridge configuration between VIGNP and ground. The FWD and REV inputs determine the direction of current flow in the H-Bridge by directing the PWM input to one of the low side MOSFETs. When a change in the current direction is commanded through the microprocessor, the PWM must switch from one low side MOSFET to the other without shoot-through current in the H-Bridge. The REDIS input pin automatically re-enables the low side MOSFET once its input voltage exceeds 4.0V. An external capacitor (CREDIS) determines the time interval while the SCLK input is the clock signal input for synchronization of serial data transfer.

This design has various applications such as throttle control or exhaust gas recirculation actuators. It is particularly well suited for the harsh environment found in automotive powertrain systems. It provides the means to efficiently drive a DC motor in both forward and reverse shaft rotation through a monolithic H-Bridge comprising low RDS(ON) N-channel MOSFETs and integrated control circuitry.



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