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NCP1207A

ON Semiconductor
Part Number NCP1207A
Manufacturer ON Semiconductor
Description PWM Controller
Published Apr 13, 2007
Detailed Description DATA SHEET www.onsemi.com PWM Current-Mode Controller for Free Running Quasi-Resonant Operation NCP1207A, NCP1207B The ...
Datasheet PDF File NCP1207A PDF File

NCP1207A
NCP1207A

Overview
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 tr...


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