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| TPS9263x－Q1三路汽车LED驱动和调光解决方案 |
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| 文章来源： 更新时间：2014/5/28 10:49:00 |
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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
图6. TPS92630-Q1评估模块(EVM)电路图
TPS92630-Q1评估模块(EVM)材料清单:
图6. TPS92630-Q1评估模块(EVM)PCB布局图:顶层
图7. TPS92630-Q1评估模块(EVM) PCB铜线布局图:顶层
图8. TPS92630-Q1评估模块(EVM)PCB布局图:底层
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