LM5035AMH datasheet(1/30 Pages) NSC

部件名	LM5035AMH

功能描述	PWM Controller with Integrated Half-Bridge and SyncFET PWM Controller with Integrated Half-Bridge and SyncFET

PDF	30 Pages

Scroll/Zoom	100%

制造商	NSC [National Semiconductor (TI)]

网页	http://www.national.com

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LM5035A/LM5035A-1

July 30, 2010

PWM Controller with Integrated Half-Bridge and SyncFET

Drivers

General Description

The LM5035A Half-Bridge Controller/Gate Driver contains all

of the features necessary to implement half-bridge topology

power converters using voltage mode control with line voltage

feed-forward. The LM5035A is a functional variant of the

LM5035 half-bridge PWM controller. The VCC current limit

threshold has been increased to 35 mA. The soft start and

soft start currents have been increased from 50 µA to 100 µA.

The BST UV threshold has been lowered to less than the VCC

UV threshold. The ratio of the T1 and T2 delays on the SR1

and SR2 outputs has been increased from 2:1 to 3:1. The

floating high-side gate driver is capable of operating with sup-

ply voltages up to 105V. Both the high-side and low-side gate

drivers are capable of 2A peak. An internal high voltage start-

up regulator is included, along with programmable line un-

dervoltage lockout (UVLO) and overvoltage protection (OVP).

The oscillator is programmed with a single resistor to fre-

quencies up to 2MHz. The oscillator can also be synchronized

to an external clock. A current sense input and a pro-

grammable timer provide cycle-by-cycle current limit and ad-

justable hiccup mode overload protection. The differences

between LM5035, LM5035A, LM5035B, and LM5035C are

summarized in Table 2.

Features

■ 105V / 2A Half-Bridge Gate Drivers

■ Synchronous Rectifier Control Outputs with

Programmable Delays

■ High Voltage (105V) Start-up Regulator

■ Voltage mode Control with Line Feed-Forward and Volt •

Second Limiting

■ Resistor Programmed, 2MHz Capable Oscillator

■ Patent Pending Oscillator Synchronization

■ Programmable Line Under-Voltage Lockout

■ Line Over-Voltage Protection

■ Internal Thermal Shutdown Protection

■ Adjustable Soft-Start

■ Versatile Dual Mode Over-Current Protection with Hiccup

Delay Timer

■ Cycle-by-Cycle Over-Current Protection

■ Direct Opto-coupler Interface

■ 5V Reference Output

Packages

■ TSSOP-20EP

■ LLP-24 (4mm x 5mm)

■ TSSOP-28EP (LM5035A-1 only)

Simplified Application Diagram

30034101

300341

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