I have been working on a 500 watts DC to DC power Converter. I am utilizing a push pull configuration to drive a high frequency switching transformer. However, the chip that I am using for driving the mosfets doesn't have the features such as shut down or current limiting. It does provide the ability to PWM and the frequency can be set up by an external capacitor and resistor. Does any one know of a chip that has a shut down, current limiting, PWM, feedback, and soft start features for a push pull DC to DC converter. It will be for a 170 DC voltage converter on the output. Thank you