LM3481

활성

부스트, SEPIC 및 플라이백용 2.97V~48V 고효율 컨트롤러

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document-pdfAcrobat LM3481 High-Efficiency Controller for Boost, SEPIC and Flyback DC/DC Converters datasheet (Rev. I) (영어) PDF | HTML

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LM5156H

활성

2.2MHz 와이드 VIN 비동기 부스트, 플라이백 및 SEPIC 컨트롤러 - 듀얼 랜덤 확산 스펙트럼 지원 A newer device with up to 2.2-MHz Fsw, higher efficiency, spread spectrum, up to 60-V input operating voltage, and an HTSSOP package.

LM5155

활성

2.2MHz 와이드 VIN, 1.5A MOSFET 드라이버, 비동기 부스트 컨트롤러 Up to 2.2-MHz Fsw, higher efficiency and up to 45-V input operating voltage.

LM3481

활성

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제품 상세 정보

Rating

Catalog

Topology

Boost, Flyback, Forward, SEPIC

Vin (max) (V)

48

Vin (min) (V)

2.97

Vout (max) (V)

500

Vout (min) (V)

1.26

Control mode

current mode

Features

Adjustable current limit, Enable, Frequency synchronization, Light-load efficiency, Nonsynchronous rectification, Prebias startup, UVLO adjustable

Duty cycle (max) (%)

85

Iq (typ) (A)

0.0037

Operating temperature range (°C)

-40 to 125

Rating

Catalog

Topology

Boost, Flyback, Forward, SEPIC

Vin (max) (V)

48

Vin (min) (V)

2.97

Vout (max) (V)

500

Vout (min) (V)

1.26

Control mode

current mode

Features

Adjustable current limit, Enable, Frequency synchronization, Light-load efficiency, Nonsynchronous rectification, Prebias startup, UVLO adjustable

Duty cycle (max) (%)

85

Iq (typ) (A)

0.0037

Operating temperature range (°C)

-40 to 125

VSSOP (DGS)

10

14.7 mm² (3 mm × 4.9 mm)

10-Lead VSSOP package
Internal push-pull driver with 1A peak current capability
Current limit and thermal shutdown
Frequency compensation optimized with a capacitor and a resistor
Internal soft start
Current mode operation
Adjustable undervoltage lockout with hysteresis
Pulse skipping at light loads
Key specifications
- Wide supply voltage range of 2.97V to 48V
- 100kHz to 1MHz Adjustable and synchronizable clock frequency
- ±1.5% (over temperature) internal reference
- 10µA shutdown current (over temperature)
Create a custom design using the LM3481 with the WEBENCH Power Designer

10-Lead VSSOP package
Internal push-pull driver with 1A peak current capability
Current limit and thermal shutdown
Frequency compensation optimized with a capacitor and a resistor
Internal soft start
Current mode operation
Adjustable undervoltage lockout with hysteresis
Pulse skipping at light loads
Key specifications
- Wide supply voltage range of 2.97V to 48V
- 100kHz to 1MHz Adjustable and synchronizable clock frequency
- ±1.5% (over temperature) internal reference
- 10µA shutdown current (over temperature)
Create a custom design using the LM3481 with the WEBENCH Power Designer

The LM3481 device is a versatile Low-Side N-FET high-performance controller for switching regulators. The device is designed for use in boost, SEPIC and flyback converters and topologies requiring a low-side FET as the primary switch. The LM3481 device can be operated at very high switching frequencies to reduce the overall solution size. The switching frequency of the LM3481 device can be adjusted to any value between 100kHz and 1MHz by using a single external resistor or by synchronizing it to an external clock. Current mode control provides superior bandwidth and transient response in addition to cycle-by-cycle current limiting. Current limit can be programmed with a single external resistor.

The LM3481 device has built-in protection features such as thermal shutdown, short-circuit protection and overvoltage protection. Power-saving shutdown mode reduces the total supply current to 5µA and allows power supply sequencing. Internal soft start limits the inrush current at start-up. Integrated current slope compensation simplifies the design and, if needed for specific applications, can be increased using a single resistor.

The LM3481 device is a versatile Low-Side N-FET high-performance controller for switching regulators. The device is designed for use in boost, SEPIC and flyback converters and topologies requiring a low-side FET as the primary switch. The LM3481 device can be operated at very high switching frequencies to reduce the overall solution size. The switching frequency of the LM3481 device can be adjusted to any value between 100kHz and 1MHz by using a single external resistor or by synchronizing it to an external clock. Current mode control provides superior bandwidth and transient response in addition to cycle-by-cycle current limiting. Current limit can be programmed with a single external resistor.

The LM3481 device has built-in protection features such as thermal shutdown, short-circuit protection and overvoltage protection. Power-saving shutdown mode reduces the total supply current to 5µA and allows power supply sequencing. Internal soft start limits the inrush current at start-up. Integrated current slope compensation simplifies the design and, if needed for specific applications, can be increased using a single resistor.

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15개 모두 보기

상위 문서	유형	직함	형식 옵션	날짜
*	데이터 시트	LM3481 High-Efficiency Controller for Boost, SEPIC and Flyback DC/DC Converters datasheet (Rev. I)	PDF \| HTML	2025. 12. 18
	Application brief	Avoiding Pulse Skip Operation at Light Load Conditions for Asynchronous Boost Converter Designs	PDF \| HTML	2025. 9. 16
	애플리케이션 노트	AN-1286 Compensation for the LM3478 Boost Controller (Rev. D)	PDF \| HTML	2022. 8. 9
	애플리케이션 노트	LM34xx How to Design Flyback Converter with LM3481 Boost Controller (Rev. A)		2019. 4. 8
	선택 가이드	Power Management Guide 2018 (Rev. R)		2018. 6. 25
	기술 문서	Eliminating noise from the factory floor	PDF \| HTML	2016. 9. 29
	기술 문서	How do you generate a high voltage from a single cell Li Ion battery?	PDF \| HTML	2015. 12. 11
	애플리케이션 노트	Softstart Using Constant Current Constant Voltage Approach		2015. 7. 24
	기술 문서	Portable speaker power: Making the bass possible	PDF \| HTML	2015. 5. 12
	애플리케이션 노트	Demystifying Type II and Type III Compensators Using Op-Amp and OTA for DC/DC Co		2014. 7. 11
	사용 설명서	AN-2094 LM3481 SEPIC Evaluation Board (Rev. A)		2013. 4. 25
	애플리케이션 노트	AN-1990 Compensation for Current Mode Control SEPIC Converters (Rev. A)		2013. 4. 23
	애플리케이션 노트	Modeling & Design of Current Mode Control Boost Converters (Rev. B)		2013. 4. 23
	애플리케이션 노트	AN-1484 Designing A SEPIC Converter (Rev. E)		2013. 4. 23
	사용 설명서	330mW AC or DC Tiny Flyback Converter Power Supply Reference Design User Guide		2012. 1. 27

설계 및 개발

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평가 보드

LM3481-FLYBACKEVM — LM3481 부스트 컨트롤러용 절연 플라이백 토폴로지 평가 모듈

텍사스 인스트루먼트 LM3481-FLYBACKEVM은 설계자가 절연 플라이백 토폴로지에서 LM3481 DC/DC 부스트 컨트롤러의 성능을 평가하는 데 도움을 줍니다. EVM은 5.5V~36V 입력에서 작동하며 2A에서 절연 12V 출력을 제공합니다.

사용 설명서: PDF

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