Datasheet > LM5025A

LM5025A

更新时间： 2024-11-05 11:12:23

品牌	Logo	应用领域
德州仪器 - TI		控制器
页数	文件大小	规格书
35页	1081K
描述
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 PWM 控制器

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LM5025A

SNVS293F –DECEMBER 2004–REVISED AUGUST 2016

LM5025A Active Clamp Voltage Mode PWM Controller

1 Features

3 Description

The LM5025A is a functional variant of the LM5025

•

Internal Start-Up Bias Regulator

3-A Compound Main Gate Driver

active clamp PWM controller. The functional

differences of the LM5025A are that the CS1 and

CS2 current limit thresholds have been increased to

0.5 V, the internal CS2 filter discharge device has

been disabled and no longer operates each clock

cycle, and the internal V_CCand V_REFregulators

continue to operate when the line UVLO pin is below

threshold.

Programmable Line Undervoltage Lockout (UVLO)

With Adjustable Hysteresis

•

Voltage Mode Control With Feedforward

Adjustable Dual Mode Overcurrent Protection

Programmable Overlap or Dead Time Between

the Main and Active Clamp Outputs

The LM5025A PWM controller contains all of the

features necessary to implement power converters

using the Active Clamp / Reset technique. With the

active clamp technique, higher efficiencies and

greater power densities can be realized 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 1 MHz

and total PWM and current sense propagation delays

less than 100 ns. The LM5025A includes a high-

voltage start-up regulator that operates over a wide

input range of 13 V to 90 V. Additional features

include: line undervoltage lockout (UVLO), soft start,

oscillator UP and DOWN sync capability, precision

reference, and thermal shutdown.

•

Volt × Second Clamp

Programmable Soft Start

Leading Edge Blanking

Single Resistor Programmable Oscillator

Oscillator UP and DOWN Sync Capability

Precision 5-V Reference

Thermal Shutdown

Packages:

–

16-Pin TSSOP

Thermally Enhanced 16-Pin WSON

(5 mm × 5 mm)

2 Applications

•

Server Power Supplies

48-V Telecom Power Supplies

42-V Automotive Applications

High-Efficiency DC-to-DC Power Supplies

Device Information⁽¹⁾

PART NUMBER

PACKAGE

TSSOP (16)

WSON (16)

BODY SIZE (NOM)

5.00 mm × 4.40 mm

5.00 mm × 5.00 mm

LM5025A

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

the end of the data sheet.

Simplified Active Clamp Forward Power Converter

V_OUT

V_IN

35 œ 78 V

3.3 V

ERROR

AMP &

ISOLATION

LM5025A

CS1

V_IN

V_CC

UVLO

OUT_A

OUT_B

RAMP

REF

COMP

CS2

SYNC

TIME

PGND

AGND

UP/DOWN

SYNC

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...35

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LM5025A 替代型号

型号	品牌	替代类型	描述	数据表
LM5025	TI	功能相似	具有 P 或 N 沟道钳位 FET 和 0.25V CS 阈值的 90V 有源钳位电压模式

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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