Datasheet > LM5027A

LM5027A

更新时间： 2024-11-24 02:58:23

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Voltage Mode Active Clamp Controller

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LM5027A 数据手册

LM5027A

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SNVS642B –APRIL 2010–REVISED MARCH 2013

Voltage Mode Active Clamp Controller

Check for Samples: LM5027A

FEATURES

DESCRIPTION

The LM5027A is a functional variant of the LM5027

active clamp PWM controller. The functional

difference of the LM5027A is that the maximum duty

cycle of the LM5027A is decreased from 91% to 71%.

In addition, the oscillator timing equation has been

modified.

•

Voltage-Mode Control

Line Feed-Forward PWM Ramp

Internal 105V Rated Start-Up Bias Regulator

Programmable Line Under-Voltage Lockout

(UVLO) with Adjustable Hysteresis

The LM5027A pulse-width modulation (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 realized compared to conventional

catch winding or RDC clamp / reset techniques.

Three control outputs are provided: the main power

switch control (OUTA), the active clamp switch

control (OUTB), and secondary side synchronous

rectifier control (OUTSR). The timing between the

control outputs is adjustable with external resistors

that program internal precision timers. This controller

is designed for high-speed operation including an

oscillator frequency range up to 1 MHz and total

PWM propagation delays less than 50 ns. The

LM5027A includes a high-voltage startup regulator

with a maximum input voltage rating of 105V.

Additional features include Line Under Voltage

Lockout (UVLO), separate soft-start of main and

synchronous rectifier outputs, a timer for hiccup mode

current limiting, a precision reference, and thermal

shutdown.

•

Versatile Dual Mode Over-Current Protection

Programmable Volt-Second Limiter and Soft-

Start

•

Programmable Synchronous Rectifier Soft-

Start and Stop

•

Precise 500mV Over-Current Comparator

Current Sense Leading Edge Blanking

Programmable Oscillator With 1 MHz

Maximum Frequency and Synchronization

Capability

•

Precision 5V Reference

Programmable Time Delays Between Outputs

A 70% Maximum Duty Cycle

Packages

•

HTSSOP-20

WQFN-24

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

All trademarks are the property of their respective owners.

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.

12 3 4 5 6 7...35

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与LM5027A相关器件

型号	品牌	获取价格	描述	数据表
LM5027A_15	TI	获取价格	Voltage Mode Active Clamp Controller
LM5027AMH/NOPB	TI	获取价格	Voltage Mode Active Clamp Controller
LM5027AMHX/NOPB	TI	获取价格	Voltage Mode Active Clamp Controller 20-HTSSOP -40 to 125
LM5027ASQ/NOPB	TI	获取价格	Voltage Mode Active Clamp Controller
LM5027ASQX/NOPB	TI	获取价格	Voltage Mode Active Clamp Controller
LM5027MH	NSC	获取价格	Voltage Mode Active Clamp Controller
LM5027MH/NOPB	TI	获取价格	Voltage Mode Active Clamp Controller
LM5027MH/NOPB	NSC	获取价格	IC SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PDSO20, ROHS COMPLIANT, TSSOP-20, Sw
LM5027MHX	NSC	获取价格	Voltage Mode Active Clamp Controller
LM5027MHX/NOPB	TI	获取价格	Voltage Mode Active Clamp Controller 20-HTSSOP -40 to 125

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