基于 NXP TEA8918 的 PFC+LLC 170W LCD TV 电源方案

基于 NXP TEA8918 的 PFC+LLC 170W LCD TV 电源方案
2023年04月26日 11:21 电子产品世界

目前主流的 LCD TV 主要由液晶面板、 LED 背光驱动板、电源板、接收解码板构成。世平集团针对目前主流的 LCD TV 市场,推出采用 NXP 最新的 PFC + LLC 二合一 IC TEA8918 开发的 170W 电源方案,将背光驱动部分和 5V 电源供电部分集成到一块电源板上,并且取消了用于 Standby 的 Auxiliary 电源。 此紧凑的电路结构一定程度上节约了客户的成本,同时也降低了故障率。

本文引用地址:

►场景应用图

►展示板照片►展示板照片
►方案方块图►方案方块图
►测试连接图►测试连接图

►核心技术优势

1. 具有次级横流、低功耗、低器件数等特点,应用于中高端 TV 产品

2. 具备二阶 Peak Power ,适应有峰值功率要求的产品

3. 电路结构紧凑,为客户节约一定的成本,降低故障率

4. PFC OPP 和输出 OPP 双重过功率保护,降低了 IC 因过功率失效的可能

5. 多次编程单元可提供宽范围的参数配置和简单的外围线路,有利于减轻设计工作量和保证设计的一致性

6. 集成了 PFC + LLC 拓扑控制结构,多次编程单元可提供宽范围的参数配置和简单的外围线路,有利于减轻设计工作量和降低故障率,提供了灵活性和易用性

7. LLC 和 PFC 采用突发模式做软启动/软停止,有利于降低噪音

8. PFC 谷底零电压检测减小开关损耗

►方案规格

1. 输入电压: AC 100-240V

2. 输出功率:170W

3. 三组输出电压:LED 驱动电压 210-350V/600mA,12V/5A,5V/600mA

4. 待机负载 200mW 时候不超过 500mW 待机功耗

5. 集成的高压启动可以实现快速启动,并且拥有较低的待机功耗,系统空载输入功耗小于75mW

LCD
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