LM5025B

更新时间： 2024-09-16 04:20:07

品牌	Logo	应用领域
美国国家半导体 - NSC		控制器
页数	文件大小	规格书
16页	709K
描述
Active Clamp Voltage Mode PWM Controller

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LM5025B 数据手册

March 2006

LM5025B

Active Clamp Voltage Mode PWM Controller

The LM5025B includes a high-voltage start-up regulator that

operates over a wide input range of 13V to 100V. Additional

features include: Line Under Voltage Lockout (UVLO), soft-

start, oscillator UP/DOWN sync capability, precision refer-

ence and thermal shutdown.

General Description

The LM5025B is a functional variant of the LM5025 active

clamp PWM controller. The functional differences of the

LM5025B are as follows:

•

The maximum PWM duty cycle is limited to less than

75% to reduce voltage stress on the power MOSFETs.

Features

•

The CS2 hiccup mode threshold is increased to 0.5V

The CS2 filter discharge device is disabled

n Internal start-up bias regulator

n 3A compound main gate driver

n Programmable line under-voltage lockout (UVLO) with

adjustable hysteresis

The V_CCregulator continues to operate when the line

UVLO is below the threshold of normal operation

•

The V_REFregulator is switched off when the line UVLO

input falls below the operating threshold

n Voltage mode control with feed-forward

n Adjustable dual mode over-current protection

n Programmable overlap or deadtime between the main

and active clamp outputs

n Volt x Second maximum duty cycle clamp

n Programmable soft-start

n Current sense leading edge blanking

n Single resistor programmable oscillator

n Oscillator up / down sync capability

n Precision 5V reference

The internal 5kΩ COMP pin pull-up resistor is removed

The LM5025B PWM controller contains all of the features

necessary to implement power converters utilizing the Active

Clamp / Reset technique. With the active clamp technique,

higher efficiencies and greater power densities can be real-

ized compared to conventional catch winding or RDC clamp

/ reset techniques. Two control outputs are provided, the

main power switch control (OUT_A) and the active clamp

switch control (OUT_B). The two internal compound gate

drivers parallel both MOS and Bipolar devices, providing

superior gate drive characteristics. This controller is de-

signed for high-speed operation including an oscillator fre-

quency range up to 1MHz and total PWM and current sense

propagation delays less than 100ns.

n Thermal shutdown

Packages

n TSSOP-16

n LLP-16 (5x5 mm) Thermally Enhanced

Typical Application Circuit

20141101

Simplified Active Clamp Forward Power Converter

DS201411

www.national.com

12 3 4 5 6 7...16

中文翻译

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与LM5025B相关器件

型号	品牌	获取价格	描述	数据表
LM5025BMTC	NSC	获取价格	Active Clamp Voltage Mode PWM Controller
LM5025BMTC/NOPB	TI	获取价格	具有 P 或 N 沟道钳位 FET 和 75% 最大占空比的 90V 有源钳位电压模式 P
LM5025BMTCX	NSC	获取价格	Active Clamp Voltage Mode PWM Controller
LM5025BMTCX/NOPB	TI	获取价格	具有 P 或 N 沟道钳位 FET 和 75% 最大占空比的 90V 有源钳位电压模式 P
LM5025BSD	NSC	获取价格	Active Clamp Voltage Mode PWM Controller
LM5025BSD/NOPB	TI	获取价格	具有 P 或 N 沟道钳位 FET 和 75% 最大占空比的 90V 有源钳位电压模式 P
LM5025BSDX	NSC	获取价格	Active Clamp Voltage Mode PWM Controller
LM5025C	NSC	获取价格	Active Clamp Voltage Mode PWM Controller
LM5025C	TI	获取价格	LM5025C Active Clamp Voltage Mode PWM Controller
LM5025C_15	TI	获取价格	LM5025C Active Clamp Voltage Mode PWM Controller

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