NCP1215 - ON Semiconductor

The pictures are for reference only, and the specific specifications can be found in the product manual.

Part No

NCP1215
Manufacturer

ON Semiconductor
ChipWorker Part#

CW560104661
RoHS

Lead free / RoHS Compliant
Description

Low Cost Variable OFF Time Switched Mode Power Supply Controller
Documentation

Datasheet

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NCP1215 Specifications

Attribute	Attribute Value

Part Number	NCP1215
Manufacturer	ON Semiconductor
ChipWorker Part#	CW560104661
Documentation	Datasheet
	expand all
RoHS	RoHS Compliant

Product Description

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

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