CPC1590 Optically Isolated Gate Drive Circuit

The CPC1590 is a MOSFET Gate Driver that requires no external power supply: it regulates the MOSFET voltage, up to 200V, down to 12.2V for internal use. It is specifically designed for low duty cycle switching frequencies that drive 4nF of Gate capacitance. The CPC1590 accomplishes very fast MOSFET turn-on by supplying stored charge, from an external capacitor, to the MOSFET Gate when input control current is applied to the device’s LED After the MOSFET is turned on, photocurrent from the input Optocoupler keeps it on for as long as sufficient input control current flows, so there is no low-frequency operating limit. When the MOSFET is turned off, the storage capacitor charges from the device’s regulated internal voltage in preparation for the next turn-on. By Clare, Inc.