SG1842F 查看數據表（PDF） - Microsemi Corporation

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SG1842F

Current Mode PWM Controller

Microsemi Corporation 

SG1842/SG1843

Current Mode PWM Controller

Description

The SG1842/43 family of control IC's provides all the

necessary features to implement off-line fixed

frequency, current-mode switching power supplies

with a minimum number of external components.

Current-mode architecture demonstrates improved

line regulation, improved load regulation, pulse-by-

pulse current limiting and inherent protection of the

power supply output switch. The bandgap reference

is trimmed to ±1% over temperature.

Oscillator discharge current is trimmed to less than

±10%. The SG1842/43 has under-voltage lockout,

current limiting circuitry and start-up current of less

than 1mA. The totem-pole output is optimized to drive

the gate of a power MOSFET. The output is low in

the off state to provide direct interface to an

N-channel device. The SG1842/43 is specified for

operation over the full military ambient temperature

range of -55°C to 125°C. The SG2842/43 is specified

for the industrial range of -25°C to 85°C, and the

SG3842/43 is designed for the commercial range of

0°C to 70°C.

Product Highlight

Features

 Optimized For Off-Line Control

 Low Start-Up Current (<1mA)

 Automatic Feed Forward Compensation

 Trimmed Oscillator Discharge Current

 Pulse-By-Pulse Current Limiting

 Enhanced Load Response Characteristics

 Under-Voltage Lockout with 6V Hysteresis (SG1842

only)

 Double-Pulse Suppression

 High-Current Totem-Pole Output (1A Peak)

 Internally Trimmed Bandgap Reference

 500kHz Operation

 Undervoltage Lockout

SG1842 - 16 volts

SG1843 - 8.4 volts

 Low Shoot-Through Current <75mA Over

Temperature

Application

 Available To MIL-STD – 883, ¶ 1.2.1

 Available to DSCC

- Standard Microcircuit Drawing (SMD)

AC

INPUT

RST

IST

Vcc

SG3842/43

Figure 1 · Product Highlight

October 2014 Rev. 1.7

www.microsemi.com

1

© 2014 Microsemi Corporation

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