Description

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. Zero voltage 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.

Features

❐ Peak current-mode PWM Controller

❐ Two complementary MOSFET drivers

❐ Programmable deadtime between drivers

❐ High current gate drivers for main and auxiliary outputs

❐ Internal high voltage (12V to 250V) start-up regulator

❐ Programmable VIN undervoltage lockout and hysteresis

❐ VDD supply operation from 7.8V to 12V

❐ Fixed frequency PWM operation from 25KHz to 800KHz

❐ >50 duty cycle operation (up to 95)

❐ Programmable slope compensation

❐ Programmable max duty-cycle/volt-second clamp

❐ Capacitor programmable soft-start

❐ Cycle-by-cycle current limiting

❐ 100ns current sense leading edge blanking

❐ 2 MHz error amplifier

Applications

❐ Networking

❐ Telecommunication Systems and Terminals

❐ IEEE 802.3af PoE PD Devices

❐ SANS, Servers & Workstations

❐ High Efficiency Instrumentation Supplies

❐ High Efficiency Supplies for Portable Equipment