TIDA-01581
具有电流均衡功能的汽车日间行车灯双灯串 LED 驱动器参考设计
TIDA-01581
概述
This reference design is a dual string LED driver that implements an operational amplifier based circuit which balances the current in two LED rings. The operational amplifier circuit senses current in a reference string and uses feedback from a mirrored string to bias a MOSFET that egulates the current between the strings. The design uses the TPS92692-Q1 multi-topology LED driver in a boost configuration to drive the LEDs. The TPS92692-Q1 features spread spectrum frequency modulation for EMI performance, analog current adjustment and internal PWM dimming. This design includes adjustable linear thermal foldback using the LMT87-Q1 analog temperature sensor, as well as current limiting, in the event the mirrored string fails open circuit. The design also features two brightness modes. One mode is a full brightness mode ('DRL') and the other is a PWM dimming mode ('Position') which reduces brightness.
特性
- Dual string current balancing using a single LED driver
- CISPR25 Class 5 conducted and radiated emissions tested
- PWM dimming
- Operation without a microcontroller
我们开发的全面组装电路板仅用于测试和性能验证，不可用于销售。
设计文件和产品
设计文件
下载现成的系统文件，加快您的设计过程。
产品
在设计中包括 TI 产品和可能的替代产品。
技术文档
| 类型 | 标题 | 下载最新的英文版本 | 日期 | |||
|---|---|---|---|---|---|---|
| 技术文章 | Designing daytime running lights, part 2: responding to an LED fault | PDF | HTML | 2018年 12月 6日 | |||
| 技术文章 | Designing daytime running lights, part 1: adding one-fail-all-fail LED fault detec | PDF | HTML | 2018年 12月 4日 | |||
| 设计指南 | 具有电流平衡功能的汽车日间行车灯双灯串LED 驱动器参考设 | 英语版 | 2018年 2月 28日 |