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UC2842AAY Datasheet(PDF) 8 Page - Microsemi Corporation |
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UC2842AAY Datasheet(HTML) 8 Page - Microsemi Corporation |
8 / 8 page C URRENT M ODE PWM C ONTROLLER UC184xA/284xA/384xA PRODUCT DA T ABOOK 1996/1997 Copyright © 1995 Rev. 1.2 12/95 8 P RODUCTION D ATA S HEET TYPICAL APPLICA TION CIRCUITS (continued) FIGURE 8. — OFF-LINE FLYBACK REGULATOR SPECIFICATIONS Input line voltage: 90VAC to 130VAC Input frequency: 50 or 60Hz Switching frequency: 40KHz ±10% Output power: 25W maximum Output voltage: 5V +5% Output current: 2 to 5A Line regulation: 0.01%/V Load regulation: 8%/A* Efficiency @ 25 Watts, V IN = 90VAC: 70% V IN = 130VAC: 65% Output short-circuit current: 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 UC3844A error amplifier. Load regulation is therefore dependent on the coupling between secondary and control windings, and on transformer leakage inductance. 7 150k W 100pF V FB COMP V REF R T/CT 4700µF 10V 5V 2-5A ISOLATION BOUNDARY 3600pF 400V 1N4935 820pF 2.5k W 27k W 0.01µF 10µF 20V 1N4935 1k W 470pF 0.85k W MBR735 TI 4.7k W 2W 140k W 1/2W 220µF 250V 4.7k W 1W 1N4004 1N4004 1N4004 1N4004 AC INPUT V CC OUT CUR SEN GND UC3844A 20k W 3.6k W 10k W .0022µF 0.01µF 16V 3 6 2 1 8 4 5 |
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