Introduction
The Microchip HT0440 is a dual, high voltage isolated driver utilizing Microchip’s proprietary HVCMOS technology. It is designed to drive discrete MOSFETs configured as bi-directional or unidirectional switches. It can drive N-channel MOSFETs as high side switches up to 400V. The HT0440 has an internal clock which generates two independent DC isolated voltages to the outputs, VOUTA and VOUTB, when logic inputs A and B are at logic high. The internal clock can be disabled by applying an external clock signal to the CLK pin. This allows the power dissipation and AC characteristics to be tailored to meet specific needs. The HT0440 does not require any external power supplies. The internal supply voltage is supplied by either of the two logic inputs A or B when they are at logic high.