HV9608

The HV9608 provides a single chip, optimized peak current mode control solution for design of high performance PWM converters using the active-clamp transformer flux reset. Due to its programmable slope compensation feature, the HV9608 allows operation beyond 50% duty cycle. Zerovoltage switching can be accomplished through using the programmable deadtime timers. The switching frequency can be programmed from 25kHz to 800kHz using a single resistor. The internal high voltage startup circuit can ensure start-up from the input voltage from 12V to 250V. It can also maintain it in operation when the external "bootstrap" power supply is not available. The startup regulator is disconnected as soon as the HV9608 becomes powered from the bootstrap winding. It offers a programmable soft start feature using a single external capacitor. The cycle by cycle current limit feature can protect the converter from overheating and damage by limiting the output over current. The HV9608 will maintain the cycle-by-cycle current limiting mode for a period of time programmed by the soft start capacitor value. It includes a single pin UVLO circuit that allows independent accurate setting of both the turn-on and the turn-off threshold voltage. A programmable volt-second clamp reduces voltage stress of the switching devices. The HV9608 is available in a space-saving TSSOP-16 package.