LM3431-Q1
- LM3431Q/LM3431AQ are Automotive Grade Products that are AEC-Q100 Grade 1 Qualified (–40°C to 125°C operating junction temperature)
- 3-Channel Programmable LED Current
- High Accuracy Linear Current Regulation
- Analog and Digital PWM Dimming Control
- Up to 25kHz Dimming Frequency
- >100:1 Contrast Ratio
- Integrated Boost Controller
- 5V-36V Input Voltage Range
- Adjustable Switching Frequency up to 1MHz
- LED Short and Open Protection
- Selectable Fault Shutdown or Automatic Restart
- Programmable Fault Delay
- Programmable Cycle by Cycle Current Limit
- Output Over Voltage Protection
- No Audible Noise
- Enable Pin
- LED Over-Temperature Shutdown Input
- Thermal Shutdown
- TSSOP-28 Exposed Pad Package
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The LM3431 is a 3-channel linear current controller combined with a boost switching controller ideal for driving LED backlight panels in space critical applications. The LM3431 drives 3 external NPN transistors or MOSFETs to deliver high accuracy constant current to 3 LED strings. Output current is adjustable to drive strings in excess of 200 mA. The LM3431 can be expanded to drive as many as 6 LED strings.
The boost controller drives an external NFET switch for step-up regulation from input voltages between 5V and 36V. The LM3431 features LED cathode feedback to minimize regulator headroom and optimize efficiency.
A DIM input pin controls LED brightness from analog or digital control signals. Dimming frequencies up to 25 kHz are possible with a contrast ratio of 100:1. Contrast ratios greater than 1000:1 are possible at lower dimming frequencies.
The LM3431 eliminates audible noise problems by maintaining constant output voltage regulation during LED dimming. Additional features include LED short and open protection, fault delay/error flag, cycle by cycle current limit, and thermal shutdown for both the IC and LED array. The enhanced LM3431A features reduced offset voltage for higher accuracy LED current.
기술 자료
| 상위 문서 | 유형 | 직함 | 형식 옵션 | 최신 영어 버전 다운로드 | 날짜 |
|---|---|---|---|---|---|
| * | 데이터 시트 | LM3431/31A/31Q/31AQ 3-Chan Constant Current LED Driver w/Integrated Boost Cntr datasheet (Rev. G) | 2013. 5. 2 | ||
| 백서 | LED Drivers for Automotive Exterior Applications (Rev. B) | 2018. 3. 27 | |||
| 애플리케이션 노트 | AN-1656 Design Challenges of Switching LED Drivers (Rev. A) | 2013. 5. 3 | |||
| 사용 설명서 | CCFL to LED Conversion Power Supply User Guide | 2012. 1. 27 |
설계 및 개발
추가 조건 또는 필수 리소스는 사용 가능한 경우 아래 제목을 클릭하여 세부 정보 페이지를 확인하세요.
LM3431MATHCAD-CALC — MathCAD용 LM3431 구성 요소 계산기
| 패키지 | 핀 | CAD 기호, 풋프린트 및 3D 모델 |
|---|---|---|
| HTSSOP (PWP) | 28 | Ultra Librarian |
주문 및 품질
권장 제품에는 본 TI 제품과 관련된 매개 변수, 평가 모듈 또는 레퍼런스 디자인이 있을 수 있습니다.