LM5025C

更新时间： 2024-11-26 11:48:39

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	366K
描述
Active Clamp Voltage Mode PWM Controller

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中文翻译

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LM5025C 数据手册

April 23, 2009

LM5025C

Active Clamp Voltage Mode PWM Controller

General Description

Features

The LM5025C is a functional variant of the LM5025 active

clamp PWM controller. The functional differences of the

LM5025C are: The maximum duty cycle of the LM5025C is

increased from 80% to 91%. The soft-start capacitor charging

current is increased from 20 µA to 90 µA. The V_CCregulator

current limit threshold is increased from 25 mA to 55 mA. The

CS1 and CS2 current limit thresholds have been increased to

0.5V. The internal CS2 filter discharge device has been dis-

abled and no longer operates each clock cycle. The internal

V_CCand V_REFregulators continue to operate when the line

UVLO pin is below threshold.

Internal Start-up Bias Regulator

■

3A Compound Main Gate Driver

Programmable Line Under-Voltage Lockout (UVLO) with

Adjustable Hysteresis

■

Voltage Mode Control with Feed-Forward

■

Adjustable Dual Mode Over-Current Protection

Programmable Overlap or Deadtime between the Main

and Active Clamp Outputs

Volt x Second Clamp

■

Programmable Soft-start

The LM5025C 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 designed for high-

speed operation including an oscillator frequency range up to

1MHz and total PWM and current sense propagation delays

less than 100 ns. The LM5025C 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.

Leading Edge Blanking

Single Resistor Programmable Oscillator

Oscillator UP / DOWN Sync Capability

Precision 5V Reference

Thermal Shutdown

Packages

TSSOP-16

■

Typical Application Circuit

30058901

Simplified Active Clamp Forward Power Converter

300589

www.national.com

12 3 4 5 6 7...16

中文翻译

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与LM5025C相关器件

型号	品牌	获取价格	描述	数据表
LM5025C_15	TI	获取价格	LM5025C Active Clamp Voltage Mode PWM Controller
LM5025CCMTE	NSC	获取价格	Active Clamp Voltage Mode PWM Controller
LM5025CMTC	NSC	获取价格	Active Clamp Voltage Mode PWM Controller
LM5025CMTC/NOPB	TI	获取价格	LM5025C Active Clamp Voltage Mode PWM Controller
LM5025CMTCE/NOPB	TI	获取价格	LM5025C Active Clamp Voltage Mode PWM Controller
LM5025CMTCX	NSC	获取价格	Active Clamp Voltage Mode PWM Controller
LM5025CMTCX/NOPB	TI	获取价格	LM5025C Active Clamp Voltage Mode PWM Controller
LM5025DMTC/NOPB	TI	获取价格	Active Clamp Voltage Mode PWM Controller 16-TSSOP -40 to 125
LM5025MTC	NSC	获取价格	Active Clamp Voltage Mode PWM Controller
LM5025MTC/NOPB	NSC	获取价格	IC SWITCHING CONTROLLER, 660 kHz SWITCHING FREQ-MAX, PDSO16, TSSOP-16, Switching Regulator

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