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NCP1215A

ON Semiconductor
Part Number NCP1215A
Manufacturer ON Semiconductor
Description Low Cost Variable OFF Time Switched Mode Power Supply Controller
Published Jan 16, 2007
Detailed Description www.DataSheet4U.com NCP1215A Low Cost Variable OFF Time Switched Mode Power Supply Controller The NCP1215A is a control...
Datasheet PDF File NCP1215A PDF File

NCP1215A
NCP1215A

Overview
www.
DataSheet4U.
com NCP1215A Low Cost Variable OFF Time Switched Mode Power Supply Controller The NCP1215A is a controller for low power off−line flyback Switched Mode Power Supplies (SMPS) featuring low size, weight and cost constraints together with a good low standby power performance.
The operating principle uses switching frequency reduction at light load by increasing the OFF Time.
Also, when OFF Time expands, the peak current is gradually reduced down to approximately 1/4 of the maximum peak current to prevent from exciting the transformer mechanical resonances.
The risk of acoustic noise is thus greatly diminished while keeping good standby power performance.
A low power internal supply block also ensures very low current consumption at startup without hampering the standby power performance.
A special primary current sensing technique minimizes the impact of SMPS switching on control IC operation.
The choice of peak voltage across the current sense resistor allows dissipation...


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