SG1842(2000) 查看數據表（PDF） - Microsemi Corporation

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SG1842
(Rev.:2000)

CURRENT MODE PWM CONTROLLER

Microsemi Corporation 

PRODUCT DATABOOK 1996/1997

SG1842/SG1843 Series

CURRENT-MODE PWM CONTROLLER

PRODUCTION DATA SHEET

T Y P I C A L A P P L I C A T I O N C I R C U I T S (continued)

4.7W 1W

TI

USD735

AC

INPUT

673-3

220µF

250V

56kW

1W

16V

0.01pF

400V

1N3613

1N3613

4700µF

10V

5V

2-5A

20kW

3.6kW

150kW

100pF

SG1842

VFB

VCC

COMP

OUT

0.01µF

27W

20kW

10µF

20V

820pF

2.5kW

T1: Coilcraft E - 4140 - b

Primary - 97 turns

single AWG 24

Secondary - 4 turns

4 parallel AWG 22

Control - 9 turns

3 parallel AWG 28

0.01µF

10kW

.0047µF

VREF

RT/CT

CUR

SEN

GND

1kW

470pF

0.85W

ISOLATION

BOUNDARY

FIGURE 25. — OFF-LINE FLYBACK REGULATOR

SPECIFICATIONS

Input line voltage:

Input frequency:

Switching frequency:

Output power:

Output voltage:

Output current:

Line regulation:

Load regulation:

Efficiency @ 25 Watts,

V = 90VAC:

IN

V = 130VAC:

IN

Output short-circuit current:

90VAC to 130VAC

50 or 60Hz

40KHz ±10%

25W maximum

5V +5%

2 to 5A

0.01%/V

8%/A*

70%

65%

2.5Amp average

* This circuit uses a low-cost feedback scheme in which the DC

voltage developed from the primary-side control winding is

sensed by the SG1842 error amplifier. Load regulation is

therefore dependent on the coupling between secondary

and control windings, and on transformer leakage

inductance.

14

Copyright © 2000

Rev. 1.6 4/00

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