原标题：TI TIDA-01375汽车日灯(DRL)和位置灯参考设计

　　TI公司的TIDA-01375是采用TPS92830-Q1线性LED控制器的汽车日运营灯(DRL)和位置灯参考设计,采用相同的LED可实现两种功能,具有良好的EMC性能,全保护和诊断.本文介绍了参考设计TIDA-01375主要特性,框图,电路图,材料清单和PCB设计图.

　　This reference design details a solution for an automotive daytime running light (DRL) and position light. The TPS92830-Q1 linear LED controller used in this design is directly supplied from the automotive battery, allowing you to use the same LEDs for both functions. This reference design also features good EMC performance, full protection and diagnostics.

　　Automotive DRLs and position lights often reuse the same LEDs with two levels of brightness. Thisreference design offers a dual-brightness solution for DRL and position light reuse applications using theintegrated pulse-width modulation (PWM) generator of the TPS92830-Q1 controller. Using linear devices,this design has a satisfactory EMC performance that meets CISPR 25 Class-5 conducted emission andradiated emission standards and passes the ISO11452-4 bulk current injection (BCI) test.

　　This design provides protection to the LEDs and device from LED string short-to-ground and open-circuitfaults with auto recovery. The LED open-circuit detection is disabled to avoid false diagnostics on anoutput channel resulting from a low supply voltage. By using different FAULT bus configurations, thedesigner can configure the system as one-fails–all-fail or only-failed-channel-off.

　　In the design, the LED strings are located on another board with a negative temperature coefficient (NTC)thermistor placed near the LEDs. The thermistor is used to protect the LEDs from overheating by reducingthe output current when the detected temperature rises above the set point. Also, the LED current can bereduced when the input voltage is higher than 18 V to protect the MOSFETs from overheating.

　　参考设计TIDA-01375主要特性:

　　• Automotive Battery Supply

　　• Meets CISPR 25 Conducted and RadiatedEmission Standards and Passes ISO11452-4 BCITest

　　• DRL and Position Light Reuse by Using DeviceInternal PWM Generator

　　• LED-String Open-Circuit, Short-to-Ground, andShort-to-Battery Diagnostics With Auto Recovery

　　• Fault Bus Configurable as One-Fails–All-Fail orOnly-Failed-Channel-Off

　　• LED Thermal Protection

　　图1.参考设计TIDA-01375外形图

　　参考设计TIDA-01375应用:

　　• Automotive Daytime Running Light

　　• Automotive Position Light

　　图4.参考设计TIDA-01375电路图(2)

　　参考设计TIDA-01375材料清单:

　　详情请见:

tidrtq1.pdf.pdf

tidrtq2.pdf.pdf

tidrtq4.pdf.pdf

tidud55.pdf.pdf