原标题：TI TPS9263x-Q1三路汽车LED驱动和调光解决方案

　　TI公司的TPS9263x-Q1是具有模拟和PWM调光控制的三路线性LED驱动器,每路LED驱动电流高达150mA,输出可并联以达到450mA,每路的精度在±1.5%-±2.5%,输入电压5V-40V, 符合AEC-Q100标准,主要用在汽车LED照明如白天驾驭灯,位置灯,雾灯,后灯,起停灯和内部照明.本文介绍了TPS92630-Q1主要特性,框图,典型应用以及TPS92630-Q1评估模块(EVM)主要特性,电路图,材料清单和PCB元件和铜线布局图.

　　The TPS9263x-Q1 devices are three-channel linear LED drivers with analog and PWM dimming control. Their full-diagnostic and built-in protection capabilities make them the ideal solution for variable-intensity LED lighting applications up to the medium-power range.

　　The design of this device suits it well for driving LEDs configured as a single string or multiple strings within its power capability. A single device can drive up to three strings with one to three LEDs in each string at a total current of up to 150 mA per channel. Outputs can be paralleled to provide higher current drive capability to 450 mA.

　　In multiple-string applications, the device offers the advantage of having common-cathode connection of the LED strings. So, there is only a single return wire needed instead of one per LED string that a system with low-side current sense would need.

　　A single-LED short comparator allows detection of single LED failing with a short circuit. Fault output can support bus connection topology between multiple ICs.

　　The included temperature monitor reduces the LED drive current if the IC junction temperature exceeds a thermal threshold. One can program the temperature threshold through an external resistor. One can disable the thermal current-monitor feature by connecting the TEMP terminal to ground. Output of the junction temperature as an analog voltage is available as a factory program option.

　　TPS92630-Q1主要特性:

　　Qualified for Automotive Applications

　　AEC-Q100 Qualified With the Following Results:

　　Device Temperature Grade 1: –40℃ to 125℃ Ambient

　　Operating Temperature Range

　　Device HBM ESD Classification Level H2

　　Device CDM ESD Classification Level C3B

　　3-Ch. LED Driver With Analog and PWM Dimming

　　Wide Input-Voltage Range: 5 V–40 V

　　Adjustable Constant Output Current Set by Reference Resistor

　　Max. Current: 150 mA per Channel

　　Max. Current: 450 mA in Parallel Operation Mode

　　Accuracy: ±1.5% per Channel When I(IOUTx) > 30 mA

　　Accuracy: ±2.5% per Device When I(IOUTx) > 30 mA

　　Parallel Outputs for Higher Current Using

　　Multiple ICs or Multiple Channels of a Single IC

　　Low Dropout Voltage

　　Max. Dropout: 400 mV at 60 mA per Channel

　　Max. Dropout: 0.9 V at 150 mA per Channel

　　Independent PWM Dimming per Channel

　　Open and Shorted LED Detection With Deglitch Timer

　　LED String Voltage Feedback per Channel for Single-LED

　　Short Detection

　　Separate Fault Terminal for Single-LED Short Failure

　　Fault Terminal for Open, Short, and Thermal Shutdown

　　Failure Reporting, Allowing Parallel Bus Connection

　　up to 15 Devices

　　IC Accommodates a Slow Input-Voltage dV/dt (0.5 V/min)

　　With No Issues

　　Two Options for Device Temperature Information

　　TPS92630-Q1: Temperature-Current Foldback

　　to Prevent Thermal Shutdown, With Programmable Threshold

　　TPS92631-Q1: Analog Voltage Output Proportional to the Device

　　Temperature

　　Operating Junction Temperature Range –40℃ to 150℃

　　Package: 16-Terminal Thermally Enhanced PWP Package (HTSSOP)

　　TPS92630-Q1应用:

　　• Automotive LED Lighting Applications, Such As:

　　– Daytime Running Light

　　– Position Light

　　– Fog Light

　　– Rear Light

　　– Stop or Taillight

　　– Interior Lighting

　　图1. TPS92630-Q1功能框图

　　图2.TPS92630-Q1两级亮度调整电路图

　　图3.两个TPS92630-Q1并联大负载驱动电路图(1)

　　图4.两个TPS92630-Q1并联大负载驱动电路图(2)

　　TPS92630-Q1评估模块(EVM)

　　The Texas Instruments TP92630EVM evaluation module (EVM) helps designers evaluate the operation and performance of the TPS92630-Q1. The TPS92630-Q1 is a three-channel linear LED driver with independent PWM dimming control. It is designed and well suited for driving multiple strings of red LEDs or a single string of white LEDs up to a medium power range. The TPS92630-Q1 IC is capable of operating at input voltages up to 40 V. Due to thermal considerations, the EVM may not allow an input voltage this high.

　　TPS92630-Q1评估模块(EVM)主要特性:

　　图5. TPS92630-Q1评估模块(EVM)外形图

　　TPS92630-Q1评估模块(EVM)材料清单: