NXP UBA20270 35W，46V,690mA LED驱动参考设计方案

NXP公司的UBA20270是一款控制更高功率自供电紧凑型荧光灯照明应用的高电压功率驱动芯片，该芯片具有先进的可调光特性和电流增压控制特性。该控制器包含半桥驱动功能，集成限幅二极管实现高压电平偏移电路。此外，还内嵌振荡器功能、防预热及燃烧的电流控制功能、计时功能和保护电路。本文首先介绍芯片的简介、特性、内部框图及应用领域，并给出相应设计方案的设计原理图、元器件列表及PCB元件布局图。

The UBA20270 is a high-voltage power IC intended to control higher powered self ballasted Compact Fluorescent Lamp (CFL) lighting applications. The UBA20270 is a controller circuit with advanced features for dimming and has a lamp current controlled boost feature for boosting cold (amalgam) CFLs.

The controller contains a half-bridge drive function for CFL, a high-voltage level-shift circuit with integrated bootstrap diode. In addition, the controller contains an oscillator function, a current control function both for preheat and burn, a timer function and protection circuits. The UBA20270 is supplied via a dV/dt current charge supply circuit from the half-bridge circuit.

UBA20270主要特性：

Half-bridge features
nIntegrated high-voltage level-shift function with integrated bootstrap diode
Preheat and ignition features
nCoil saturation protection during ignition
nAdjustable preheat time
nAdjustable preheat current..

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