Datasheet > SG2846

SG2846

更新时间： 2024-11-24 14:48:15

品牌	Logo	应用领域
美国微芯 - MICROCHIP		/
页数	文件大小	规格书
17页	824K
描述
The SG1846 family of control ICs provides the required features to implement Fixed Frequency, Curr

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SG2846 数据手册

SG1846/SG2846/SG3846

Current Mode PWM Controller

Features

Description

. Automatic Feed-forward Compensation

. Programmable Pulse by Pulse Current Limiting

The SG1846 family of control ICs provides the required

features to implement Fixed Frequency, Current mode

control schemes while maintaining a minimum external

. Automatic Symmetry Correction in Push-pull

Configuration

parts count.

The advanced performance of this

technique can be measured in improved line regulation,

enhanced load response characteristics, and a simpler,

easier-to-design control loop. Topological advantages

include, inherent pulse-by-pulse current limiting

capability, automatic symmetry correction for push-pull

converters, and the ability to parallel “power modules”

while maintaining equal current sharing.

. Enhanced Load Response Characteristics

. Parallel Operation Capability for Modular Power

Systems

. Differential Current Sense Amplifier with Wide

Common-mode Range

. Double Pulse Suppression

. 200mA Totem-pole Outputs

. ± 1% Bandgap Reference

. Under-voltage Lockout

Protection circuitry includes built-in under-voltage

lockout and programmable current limit in addition to

soft start capability. A shutdown function is also

available which can initiate either a complete shutdown

with automatic restart, or latch the supply off.

. Soft-start and Shutdown Capability

. 500kHz Operation

Other features include fully latched operation, double-

pulse suppression, dead-time adjust capability, and a High Reliability Features

±1% trimmed bandgap reference.

Available To MIL-STD-883 – 883, ¶ 1.2.1

Available to DSCC

– Standard Microcircuit Drawing (SMD)

. SGR1846 Rad-Tolerant Version Available

Block Diagram

5.1 V

REFERENCE

REGULATOR

REF

SYNC

OSC

U.V.LOCKOUT

A OUT

-CURRENT

SENSE

SG1846

Output Stoge

COMP

+CURRENT

SENSE

B OUT

GND

0.5 V

0.5 mA

CURRENT LIMITADJUST

SHUTDOWN

N.I.

INV.

E.A.

350 mV

COMP

Figure 1 · Block Diagram

November 2014 Rev. 1.2

www.microsemi.com

12 3 4 5 6 7...17

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