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| TPS9263x－Q1三路汽車LED驅(qū)動和調(diào)光解決方案 |
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| 文章來源： 更新時(shí)間：2014/5/28 10:49:00 |
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TI公司的TPS9263x－Q1是具有模擬和PWM調(diào)光控制的三路線性LED驅(qū)動器,每路LED驅(qū)動電流高達(dá)150mA,輸出可并聯(lián)以達(dá)到450mA,每路的精度在±1.5%－±2.5%,輸入電壓5V－40V,符合AEC－Q100標(biāo)準(zhǔn),主要用在汽車LED照明如白天駕馭燈,位置燈,霧燈,后燈,起停燈和內(nèi)部照明.本文介紹了TPS92630-Q1主要特性,框圖,典型應(yīng)用以及TPS92630-Q1評估模塊(EVM)主要特性,電路圖,材料清單和PCB元件和銅線布局圖.
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應(yīng)用:
• Automotive LED Lighting Applications, Such As:
– Daytime Running Light
– Position Light
– Fog Light
– Rear Light
– Stop or Taillight
– Interior Lighting
圖1. TPS92630-Q1功能框圖
圖2.TPS92630-Q1兩級亮度調(diào)整電路圖
圖3.兩個(gè)TPS92630-Q1并聯(lián)大負(fù)載驅(qū)動電路圖(1)
圖4.兩個(gè)TPS92630-Q1并聯(lián)大負(fù)載驅(qū)動電路圖(2)
TPS92630-Q1評估模塊(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評估模塊(EVM)主要特性:
圖5. TPS92630-Q1評估模塊(EVM)外形圖
圖6. TPS92630-Q1評估模塊(EVM)電路圖
TPS92630-Q1評估模塊(EVM)材料清單:
圖6. TPS92630-Q1評估模塊(EVM)PCB布局圖:頂層
圖7. TPS92630-Q1評估模塊(EVM) PCB銅線布局圖:頂層
圖8. TPS92630-Q1評估模塊(EVM)PCB布局圖:底層 |
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