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NCP1215DR2
Low Cost Variable OFF Time Switched Mode Power Supply Controller
NCP1215
Product Preview
Low Cost Variable OFF Time
Switched Mode Power
Supply Controller
The NCP1215 is a controller for low power off−line flyback
Switchemode 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 to be
further reduced. The negative current sensing technique offers
advantages over a traditional approach by avoiding the voltage drop
incurred by traditional MOSFET source sensing. Thus, the IC drive
capability is greatly improved.
Finally, the bulk input ripple ensures a natural frequency dithering
which smooths the EMI signature.
Features Pb−Free Package is Available Variable OFF Time Control Method Very Low Current Consumption at Startup Natural Frequency Dithering for Improved EMI Signature Current Mode Control Operation Peak Current Compression Reduces Transformer Noise Programmable Current Sense Resistor Peak Voltage Undervoltage Lockout
Typical Applications Auxiliary Power Supply Standby Power Supply AC−DC Adapter Off−line Battery Charger
This document contains information on a product under development. ON Semiconductor
