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LM3407
- Input Operating Range 4.5 V to 30 V
- Output Voltage Range: 0.1 VIN to 0.9 VIN
- Accurate Constant Current Output
- Independent Device Enable (CMOS Compatible) and PWM Dimming Control
- Converter Switching Frequency Adjustable From 300 kHz to 1 MHz
- No External Control Loop Compensation Required
- Supports Ceramic and Low ESR Output Capacitors
- Input Undervoltage Lockout (UVLO)
- Thermal Shutdown Protection
- MSOP-8 PowerPAD Package
The LM3407 device is a constant current output floating buck switching converter designed to provide constant current to high-power LEDs. The device is ideal for automotive, industrial, and general lighting applications. The LM3407 has an integrated power N-channel MOSFET that makes the application solution compact and simple to implement. An external 1% thick-film resistor allows the converter output voltage to adjust as needed to deliver constant current within 10% accuracy to a serially connected LED string of varying number and type. Converter switching frequency is adjustable from 300 kHz to 1 MHz. The LM3407 features a dimming input to enable LED brightness control by Pulse Width Modulation (PWM). Additionally, a separate enable pin allows for low-power shutdown. An exposed pad MSOP-8 package provides excellent heat dissipation and thermal performance. Input UVLO and output open-circuit protection ensure a robust LED driver solution.
기술 자료
| 상위 문서 | 유형 | 직함 | 형식 옵션 | 최신 영어 버전 다운로드 | 날짜 |
|---|---|---|---|---|---|
| * | 데이터 시트 | LM3407 350-mA, Constant Current Output Floating Buck Switching Converter for High-Power LEDs datasheet (Rev. C) | PDF | HTML | 2016. 11. 15 | |
| 백서 | Common LED Functions and LED Driver Design Considerations | 2020. 9. 21 | |||
| 애플리케이션 노트 | AN-1656 Design Challenges of Switching LED Drivers (Rev. A) | 2013. 5. 3 | |||
| 애플리케이션 노트 | AN-1982 Small, Wide Input Voltage Range LM2842 Keeps LEDs Cool (Rev. A) | 2013. 4. 23 |
설계 및 개발
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LM3407EVAL — 350mA, 정전류 부동 벅 스위칭 레귤레이터 평가 보드
The LM3407 evaluation board contains a Pulse-Width-Modulation (PWM) floating buck converter with an integrated N-Channel power MOSFET and is designed to provide a constant current output for driving high power LEDs, such as the Lumileds Luxeon® power LEDs and OSRAM Golden DRAGON® LED.
LM3407DESIGN-CALC — LM3407 부품 계산기
| 패키지 | 핀 | CAD 기호, 풋프린트 및 3D 모델 |
|---|---|---|
| HVSSOP (DGN) | 8 | Ultra Librarian |