NCP1336 데이터 시트보기 (PDF) - ON Semiconductor

부품명

상세내역

일치하는 목록

NCP1336

Quasi-Resonant Current Mode Controller for High Power Universal Off-Line Supplies

ON Semiconductor 

NCP1336A/B

Figure 8. Selected Valley According to FB State

As the output load decreases (FB voltage decreases), the

valleys are incremented from the first to the fourth. When

the fourth valley is reached, if FB voltage further decreases

below 0.8 V, the controller enters VCO mode as in

NCP1351.

During VCO operation, the peak current is frozen to 25%

of maximum peak current: the switching frequency expands

to deliver the necessary output power. This allows achieving

very low standby power consumption.

Figure 9 shows a simulation case where the output current

of a 19 V / 60 W adapter decreases from 2.5 A to 0.5 A. No

instability is seen during the valley transitions (Figures 10,

11, 12 and 13.)

Figure 9. Output Load Decreases from 2.5 A to

0.5 A at VIN = 120 Vdc for a 19 V / 60 W Adapter

http://onsemi.com

13

Share Link: