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NCP1207A Datasheet

Part Number NCP1207A
Manufacturers ON Semiconductor
Logo ON Semiconductor
Description PWM Controller
Datasheet NCP1207A DatasheetNCP1207A Datasheet (PDF)

DATA SHEET www.onsemi.com PWM Current-Mode Controller for Free Running Quasi-Resonant Operation NCP1207A, NCP1207B The NCP1207A/B combines a true current mode modulator and a demagnetization detector to ensure full borderline/critical Conduction Mode in any load/line conditions and minimum drain voltage switching (Quasi−Resonant operation). Due to its inherent skip cycle capability, the controller enters burst mode as soon as the power demand falls below a predetermined level. As this happens a.

  NCP1207A   NCP1207A






Part Number NCP1207B
Manufacturers ON Semiconductor
Logo ON Semiconductor
Description PWM Controller
Datasheet NCP1207A DatasheetNCP1207B Datasheet (PDF)

DATA SHEET www.onsemi.com PWM Current-Mode Controller for Free Running Quasi-Resonant Operation NCP1207A, NCP1207B The NCP1207A/B combines a true current mode modulator and a demagnetization detector to ensure full borderline/critical Conduction Mode in any load/line conditions and minimum drain voltage switching (Quasi−Resonant operation). Due to its inherent skip cycle capability, the controller enters burst mode as soon as the power demand falls below a predetermined level. As this happens a.

  NCP1207A   NCP1207A







Part Number NCP1207
Manufacturers ON Semiconductor
Logo ON Semiconductor
Description PWM Current-Mode Controller
Datasheet NCP1207A DatasheetNCP1207 Datasheet (PDF)

NCP1207 PWM Current−Mode Controller for Free Running Quasi−Resonant Operation The NCP1207 combines a true current mode modulator and a demagnetization detector to ensure full borderline/critical Conduction Mode in any load/line conditions and minimum drain voltage switching (Quasi−Resonant operation). Due to its inherent skip cycle capability, the controller enters burst mode as soon as the power demand falls below a predetermined level. As this happens at low peak current, no audible noise can.

  NCP1207A   NCP1207A







PWM Controller

DATA SHEET www.onsemi.com PWM Current-Mode Controller for Free Running Quasi-Resonant Operation NCP1207A, NCP1207B The NCP1207A/B combines a true current mode modulator and a demagnetization detector to ensure full borderline/critical Conduction Mode in any load/line conditions and minimum drain voltage switching (Quasi−Resonant operation). Due to its inherent skip cycle capability, the controller enters burst mode as soon as the power demand falls below a predetermined level. As this happens at low peak current, no audible noise can be heard. For the NCP1207A, an internal 8.0 ms timer prevents the free−run frequency to exceed 125 kHz (therefore below the 150 kHz CISPR−22 EMI starting limit), while the skip adjustment capability lets the user select the frequency at which the burst foldback takes place. For the NCP1207B, the internal timer duration is reduced to 4.5 ms to allow operation at higher frequencies (up to 200 kHz). The Dynamic Self−Supply (DSS) drastically simplifies the transformer design in avoiding the use of an auxiliary winding to supply the NCP1207A/B. This feature is particularly useful in applications where the output voltage varies during operation (e.g. battery chargers). Due to its high−voltage technology, the IC is directly connected to the high−voltage DC rail. As a result, the short−circuit trip point is not dependent upon any VCC auxiliary level. The transformer core reset detection is done through an auxiliary winding which, brought via a dedicated.


2007-04-13 : 2N3055    2N3772    2N3773    2N3904    2N3906    2N4401    2N4403    2N5401    2N5551    2N6099   


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