LM5025A

更新时间： 2024-11-22 22:47:03

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	696K
描述
Active Clamp Voltage Mode PWM Controller

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中文翻译

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LM5025A 数据手册

December 2004

LM5025A

Active Clamp Voltage Mode PWM Controller

General Description

Features

n Internal Start-up Bias Regulator

n 3A Compound Main Gate Driver

The LM5025A is a functional variant of the LM5025 active

clamp PWM controller. The functional differences of the

LM5025A are: The CS1 and CS2 current limit thresholds

have been increased to 0.5V. The internal CS2 filter dis-

charge device has been disabled and no longer operates

each clock cycle. The internal V_CCand V_REFregulators

continue to operate when the line UVLO pin is below thresh-

old.

n Programmable Line Under-Voltage Lockout (UVLO) with

Adjustable Hysteresis

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

The LM5025A 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. The LM5025A includes

a high-voltage start-up regulator that operates over a wide

input range of 13V to 90V. Additional features include: Line

Under Voltage Lockout (UVLO), softstart, oscillator UP/

DOWN sync capability, precision reference and thermal

shutdown.

n Volt x Second Clamp

n Programmable Soft-start

n Leading Edge Blanking

n Single Resistor Programmable Oscillator

n Oscillator UP / DOWN Sync Capability

n Precision 5V Reference

n Thermal Shutdown

Packages

n TSSOP-16

n LLP-16 (5x5 mm) Thermally Enhanced

Typical Application Circuit

20107401

Simplified Active Clamp Forward Power Converter

DS201074

www.national.com

12 3 4 5 6 7...16

中文翻译

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与LM5025A相关器件

型号	品牌	获取价格	描述	数据表
LM5025AMTC	NSC	获取价格	Active Clamp Voltage Mode PWM Controller
LM5025AMTC/NOPB	ROCHESTER	获取价格	3 A SWITCHING CONTROLLER, 650 kHz SWITCHING FREQ-MAX, PDSO16, TSSOP-16
LM5025AMTC/NOPB	TI	获取价格	具有 P 或 N 沟道钳位 FET 和 0.5V CS 阈值的 90V 有源钳位电压模式
LM5025AMTCX	NSC	获取价格	Active Clamp Voltage Mode PWM Controller
LM5025AMTCX/NOPB	NSC	获取价格	IC 3 A SWITCHING CONTROLLER, 650 kHz SWITCHING FREQ-MAX, PDSO16, TSSOP-16, Switching Regul
LM5025AMTCX/NOPB	TI	获取价格	具有 P 或 N 沟道钳位 FET 和 0.5V CS 阈值的 90V 有源钳位电压模式
LM5025ASD	NSC	获取价格	Active Clamp Voltage Mode PWM Controller
LM5025ASD/NOPB	TI	获取价格	具有 P 或 N 沟道钳位 FET 和 0.5V CS 阈值的 90V 有源钳位电压模式
LM5025ASDX	NSC	获取价格	Active Clamp Voltage Mode PWM Controller
LM5025ASDX/NOPB	TI	获取价格	具有 P 或 N 沟道钳位 FET 和 0.5V CS 阈值的 90V 有源钳位电压模式

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