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UC3842D データシート(PDF) 7 Page - NXP Semiconductors |
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UC3842D データシート(HTML) 7 Page - NXP Semiconductors |
7 / 8 page Philips Semiconductors Linear Products Product specification UC3842 Current-mode PWM controller August 31, 1994 1106 OFF-LINE FLYBACK REGULATOR UC3842 4.7 1W 673-3 AC INPUT 250V 56k 1W 16V 20k 150k 3.6k 100pF COMP 10k 2 1 8 4 7 6 3 5 GND CUR SEN OUT 27 20k 1k 0.85 UFN432 1N3613 ISOLATION BOUNDARY 2.5k 820pF 1N3613 400V 4.7k 4W T1 USD735 10V DC OUT (5V 2–5A) + – 220 µF 10 µF 20V 0.01 µF 0.01 µF 0.0047 µF 0.01 µF 4700 µF 470pF VFB VREF RT/CT VCC NOTES: T1: Coilcraft E-4140-B Primary – 97 turns single AWG24 Secondary – 4 turns 4 parallel AWG22 control – 9 turns –3 parallel AWG28 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 W, VIN=90VAC: 70% VIN=130VAC: 65% Output short-circuit current: 2.5A average NOTE: This circuit uses a low-cost feedback scheme in which the DC voltage developed from the primary-side control winding is sensed by the UC3842 error amplifier. Load regulation is therefore dependent on the coupling between secondary and control windings, and on transformer leakage inductance. For applications requiring better load regulation, a UC1901 Isolated Feedback Generator can be used to directly sense the output voltage. |
同様の部品番号 - UC3842D |
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同様の説明 - UC3842D |
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