5.10 Minimum Input Pulse Recommendation

The MCP14H2304 has RC filter on the input lines to be more resilient in noisy environments. With a rising edge at the input to the gate driver, and then after the propagation delay of the IC, delay from gate resistor, and rise time of the MOSFET, the halfbridge will turn ON producing bus voltage at the output. This MOSFET turn ON produces significant system noise. For optimal operation, it is suggested to provide a minimum pulse width at the input to the IC from the MCU to ensure the turn OFF occurs after this event. As a rule of thumb, this minimum pulse should be two times the deadtime for halfbridge drivers. Hence, for the MCP14H2304, the minimum pulse recommended at the logic inputs is 200 ns.

During typical operation, the MCP14H2304 will respond to an input greater than 50 ns (approximate value from the RC input filter response). Hence, for an input pulse greater than approximately 50 ns, the IC will follow the pulse as expected and, for an input pulse shorter than 50 ns, there will be no response from the IC.