DESCRIPTION
The Si9978 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.

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