SI9978DW ics components Configurable H Bridge Driver electronic chip board

Configurable H-Bridge Driver

FEATURES

• H-Bridge or Dual Half-Bridge Operation

• 20- to 40-V Supply

• Static (dc) Operation

• Cross-Conduction Protected

• Current Limit

• Undervoltage Lockout

• ESD Protected

• Fault Output

DESCRIPTION

  The Si9978DW is an integrated driver for an n-channel MOSFET H-bridge.

The mode control allows operation as either a full H-bridge driver or as two independent half-bridges. The DIR/PWM input configuration allows easy implementation of either sign/magnitude or anti-phase PWM drive schemes for full H-bridges.

Schmitt triggers on the inputs provide logic signal compatibility and hysteresis for increased noise immunity. An internal low-voltage regulator allows the device to be powered directly from a system supply of 20 to 40 volts. All n-channel gates are driven directly from low-impedance outputs.

The addition of one external capacitor per half-bridge allows internal circuitry to level shift both the power supply and logic signal for the high-side n-channel gate drives.

Internal charge pumps replace leakage current lost in the high-side driver circuits to provide “static” (dc) operation in any output condition.

Protection features include an undervoltage lockout, cross-conduction prevention logic, and overcurrent monitors. 

  The Si9978DW is available in the 24-pin wide-body SOIC (surface mount) package, specified to operate over the industrial (-40 to +85°C) temperature range.

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