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25W高效（>90%）高功率因素（>0.97）非隔离Buck-Boost型T10灯管LED驱动参考设计报告
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1 Introduction
This document describes a non-isolated， power factor corrected， low THD， high-efficiency
LED driver designed to drive a 144 V LED string at 180 mA from an input voltage range
of 90 VAC to 265 VAC.
The LYTSwitch-4 has been developed to cost effectively implement a single-stage power
factor corrected LED driver combined with primary-side constant-current control. The
LYTSwitch-4 controller is optimized for LED driver applications and requires minimal
external parts. It provides control of output current without the use of an optocoupler.
The LYTSwitch-4 monolithically combines the 725 V power MOSFET and controller. The
controller consists of an oscillator， PWM， 6 V regulator， over-temperature protection，
frequency jittering， cycle-by-cycle current limit and other protection features plus a charge
controller for output CC （constant current） control.
The LYTSwitch-4 provides a sophisticated range of protection features including autorestart for control loop open/short faults and output short-circuit conditions. The accurate
hysteretic thermal shutdown ensures safe PCB temperatures under all conditions.
The non-isolated power factor corrected buck-boost design presented in this report
shows how LYTSwitch-4 dramatically simplifies off-line， high-efficiency， power factor
corrected LED driver design and enables an EN 61000-3-2 Class C compliant
implementation of a very high efficiency， high output voltage LED driver.
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