ST L6599AD

谐振转换器控制器8.85V ~ 16V3.5 mA

Overview

The L6599AD is an improved high-voltage Resonant Controller provides 50% complementary duty cycle, the high-side switch and the low-side switch are driven ON/OFF 180° out-of-phase for exactly the same time. Output voltage regulation is obtained by modulating the operating frequency. A fixed dead-time inserted between the turn-OFF of one switch and the turn-ON of the other guarantees soft-switching and enables high-frequency operation. To drive the high-side switch with the bootstrap approach, the IC incorporates a high-voltage floating structure able to withstand more than 600V with a synchronous-driven high-voltage DMOS that replaces the external fast-recovery bootstrap diode. The IC enables the designer to set the operating frequency range of the converter by means of an externally programmable oscillator. At light load the IC may enter a controlled burst mode operation that keeps the converter input consumption to a minimum.

Features

Burst-mode operation at light load

600V-rail compatible high-side gate driver with integrated bootstrap diode and high dV/dt immunity

50% duty cycle, variable frequency control of resonant half-bridge

Integrated high-accuracy oscillator

Latched disable input

Up to 500kHz operating frequency

Interface with PFC controller

Two-level OCP: frequency-shift and latched shutdown

Non-linear soft-start for monotonic output voltage rise

DIP-16, SO-16N packages

Input for power-ON/OFF sequencing or brownout protection

-300/800mA high-side and low-side gate drivers with UVLO pull-down

Applications

LCD & PDP TV

Desktop PC

Entry-level server

Telecom SMPS

AC-DC adapter

Open frame SMPS