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NCP1351

Part Number	NCP1351
Manufacturer	ON Semiconductor
Description	Variable Off Time PWM Controller
Published	Jan 16, 2007
Detailed Description	NCP1351 Variable Off Time PWM Controller The NCP1351 is a current-mode controller targeting low power off-line flyback...
Datasheet	NCP1351 PDF File

Overview

NCP1351 Variable Off Time PWM Controller The NCP1351 is a current-mode controller targeting low power off-line flyback Switched Mode Power Supplies (SMPS) where cost is of utmost importance.
Based on a fixed peak current technique (quasi-fixed TON), the controller decreases its switching frequency as the load becomes lighter.
As a result, a power supply using the NCP1351 naturally offers excellent no-load power consumption, while optimizing the efficiency in other loading conditions.
When the frequency decreases, the peak current is gradually reduced down to approximately 30% of the maximum peak current to prevent transformer mechanical resonance.
The risk of acoustic noise is thus greatly...

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