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