AN603
features integral high-side drive circuitry and an internal voltage regulator, which allows operation over a 20to 40-V dc input voltage range. Protection features include cross-conduction protection, current limiting, and undervoltage lockout. The FAULT outputs indicate when undervoltage or overcurrent shutdown has occurred. The Si9978DW is packaged in a 24-pin wide body SOIC.
CONTROL LOGIC
The Si9978 has two modes of operation, full H-bridge, and independent half-bridge. The mode of operation determines the function of the input pins and the FAULT outputs. With the MODE pin at logic 1, which is the default condition, the Si9978 functions as a full H-bridge. With the MODE pin at logic 0, the Si9978DW functions as two independent half-bridges. The definitions of the control inputs depend on the mode of operation. All control inputs are pulled up to VDD. The FAULT outputs are open drain. Truth Tables have been provided for each mode of operation.
V+
24 Low-Voltage Regulator CAPA...
