LM5025

更新时间： 2024-11-03 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	315K
描述
Active Clamp Voltage Mode PWM Controller

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中文翻译

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数据手册

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LM5025 数据手册

March 2004

LM5025

Active Clamp Voltage Mode PWM Controller

General Description

Features

n Internal Start-up Bias Regulator

n 3A Compound Main Gate Driver

The LM5025 PWM controller contains all of the features

necessary to implement power converters utilizing the Active

Clamp / Reset technique. The device can be configured to

control either a P-Channel clamp switch or an N-Channel

clamp switch. With the active clamp technique, higher effi-

ciencies and greater power densities can be realized com-

pared 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 active clamp output can be configured

for either a guaranteed overlap time (for P-Channel switch

applications) or a guaranteed deadtime (for N_Channel ap-

plications). The two internal compound gate drivers parallel

both MOS and Bipolar devices, providing superior gate drive

characteristics. This controller is designed for high-speed

operation including an oscillator frequency range up to 1MHz

and total PWM and current sense propagation delays less

than 100ns. The LM5025 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, pre-

cision reference and thermal shutdown.

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

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

20086901

Simplified Active Clamp Forward Power Converter

DS200869

www.national.com

12 3 4 5 6 7...16

中文翻译

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与LM5025相关器件

型号	品牌	获取价格	描述	数据表
LM5025A	NSC	获取价格	Active Clamp Voltage Mode PWM Controller
LM5025A	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
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

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