SG1846 查看數據表（PDF） - Microsemi Corporation

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SG1846

CURRENT MODE PWM CONTROLLER

Microsemi Corporation 

SG1846/SG2846/SG3846

CURRENT MODE PWM CONTROLLER

DESCRIPTION

The SG1846 family of control ICs provides all of the necessary

features to implement fixed frequency, current mode control

schemes while maintaining a minimum external parts count. The

superior performance of this technique can be measured in im-

proved line regulation, enhanced load response characteristics,

and a simpler, easier-to-design control loop. Topological advan-

tages 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.

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.

Other features include fully latched operation, double pulse sup-

pression, deadtime adjust capability, and a ±1% trimmed bandgap

reference.

FEATURES

• Automatic feed forward compensation

• Programmable pulse by pulse current limiting

• Automatic symmetry correction in push-pull

configuration

• 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

• Soft-start capability

• Shutdown capability

• 500KHz operation

HIGH RELIABILITY FEATURES - SG1846

♦ Available to MIL-STD - 883

♦ Radiation data available

♦ LMI level "S" processing available

BLOCK DIAGRAM

4/90 Rev 1.1 2/94

Copyright © 1994

LINFINITY Microelectronics Inc.

1

11861 Western Avenue ∞ Garden Grove, CA 92841

(714) 898-8121 ∞ FAX: (714) 893-2570

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