Datasheet > LM51571

LM51571

更新时间： 2024-11-27 02:51:39

品牌	Logo	应用领域
德州仪器 - TI		/
页数	文件大小	规格书
49页	2386K
描述
LM5157 2.2-MHz Wide VIN 50-V Boost/SEPIC/Flyback Converter with Dual Random Spread Spectrum

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LM51571 数据手册

LM5157

SNVSBK7 – JULY 2021

LM5157 2.2-MHz Wide V_IN50-V Boost/SEPIC/Flyback Converter with Dual Random

Spread Spectrum

•

Audio amplifier power supply

Piezo driver/motor driver bias supply

1 Features

•

Suited for wide operating range for battery

applications

3 Description

The LM5157 device is a wide input range, non-

synchronous boost converter with integrated 50-V

power switch.

– 2.9-V to 45-V input operating range

– 48-V maximum output (50-V abs max)

– Minimum boost supply voltage of 1.5 V when

BIAS ≥ 2.9 V

– Input transient protection up to 50 V

– Minimized battery drain

The device can be used in boost, SEPIC, and flyback

topologies. The device can start up from a single-cell

battery with a minimum of 2.9 V. It can operate with an

input supply voltage as low as 1.5 V if the BIAS pin is

greater than 2.9 V.

•

Low shutdown current (I_Q≤ 2.6 µA)

Low operating current (I_Q≤ 670 µA)

•

Small solution size and low cost

The BIAS pin operates up to 45 V (50-V absolute

maximum). The switching frequency is dynamically

programmable with an external resistor from 100 kHz

to 2.2 MHz. Switching at 2.2 MHz minimizes AM band

interference and allows for a small solution size and

fast transient response. To reduce the EMI of the

power supply, the device provides a selectable Dual

Random Spread Spectrum, which reduces the EMI

over a wide frequency range.

– Maximum switching frequency up to 2.2 MHz

– 16-pin QFN package (3 mm × 3 mm)

– Integrated error amplifier allows primary-side

regulation without optocoupler (flyback)

– Accurate current limit (see the Device

Comparison Table)

EMI mitigation

– Selectable dual random spread spectrum

– Lead-less package

•

Higher efficiency with low-power dissipation

– 45-mΩ R_DSONswitch

The device features an accurate peak current limit

over the input voltage, which avoids overdesigning

power inductor. Low operating current and pulse-

skipping operation improve efficiency at light loads.

– Fast switching, small switching loss

Avoid AM band interference and crosstalk

– Optional clock synchronization

– Dynamically programmable wide switching

frequency from 100 kHz to 2.2 MHz

Integrated protection features

– Constant current limiting over input voltage

– Selectable hiccup mode overload protection

– Programmable line UVLO

– OVP protection

– Thermal shutdown

Accurate ±1% accuracy feedback reference

Adjustable soft start

PGOOD indicator

The device has built-in protection features such

as overvoltage protection, line UVLO, thermal

shutdown, and selectable Hiccup mode overload

protection. Additional features include low shutdown

I_Q, programmable soft start, precision reference,

•

power-good indicator, and external clock

synchronization.

Device Information

PART NUMBER

PACKAGE⁽¹⁾

BODY SIZE (NOM)

•

LM5157

WQFN (16)

3.00 mm × 3.00 mm

(1) For all available packages, see the orderable addendum at

the end of the data sheet.

Create a custom design using the LM5157x with

the WEBENCH^®Power Designer

V_LOAD

V_{SUPP LY}

2 Applications

•

Battery-powered wide input boost, SEPIC, flyback

converter

LED bias supply

Multiple-output flyback without optocoupler

Portable speaker application

Power module

BIAS VCC

UVLO

COMP

•

PGOOD

PGND AGND MODE

Industrial PLC

Holdup capacitor charger

Typical Sepic Application

An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,

intellectual property matters and other important disclaimers. PRODUCTION DATA.

12 3 4 5 6 7...49

中文翻译

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与LM51571相关器件

型号	品牌	获取价格	描述	数据表
LM51571-Q1	TI	获取价格	LM5157x-Q1 2.2-MHz Wide VIN 50-V Boost/SEPIC/Flyback Converter with Dual Random Spread Spe
LM51571QRTERQ1	TI	获取价格	LM5157x-Q1 2.2-MHz Wide VIN 50-V Boost/SEPIC/Flyback Converter with Dual Random Spread Spe
LM51571RTER	TI	获取价格	LM5157 2.2-MHz Wide VIN 50-V Boost/SEPIC/Flyback Converter with Dual Random Spread Spectru
LM5157-Q1	TI	获取价格	LM5157x-Q1 2.2-MHz Wide VIN 50-V Boost/SEPIC/Flyback Converter with Dual Random Spread Spe
LM5157QRTERQ1	TI	获取价格	LM5157x-Q1 2.2-MHz Wide VIN 50-V Boost/SEPIC/Flyback Converter with Dual Random Spread Spe
LM5157RTER	TI	获取价格	LM5157 2.2-MHz Wide VIN 50-V Boost/SEPIC/Flyback Converter with Dual Random Spread Spectru
LM5157X-Q1	TI	获取价格	LM5157x-Q1 2.2-MHz Wide VIN 50-V Boost/SEPIC/Flyback Converter with Dual Random Spread Spe
LM5158	TI	获取价格	LM5158x 2.2-MHz Wide VIN 85-V Output Boost/SEPIC/Flyback Converter with Dual Random Spread
LM51581	TI	获取价格	LM5158x-Q1 2.2-MHz Wide VIN 85-V Output Boost/SEPIC/Flyback Converter with Dual Random Spr
LM51581-Q1	TI	获取价格	LM5158x 2.2-MHz Wide VIN 85-V Output Boost/SEPIC/Flyback Converter with Dual Random Spread

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