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AN-6747B - Flyback Power Supply

Features

  • ng resistor value should be determined considering the over-current protection threshold and the pulse-by-pulse current limit threshold, as shown in Figure 5. The peak value of current sensing voltage (VCS) should be lower than the pulse-by-pulse current limit level for peak load condition. It should.

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Full PDF Text Transcription

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www.fairchildsemi.com AN-6747 Applying FAN6747 to Control a Flyback Power Supply with Peak Current Output 1. Introduction Highly integrated PWM controller, FAN6747, is optimized for applications with motor load, such as printers and scanners, that inherently impose some kind of overload condition on the power supply during acceleration mode. FAN6747 provides a two-level OCP function that allows the SMPS to stably deliver peak power during the motor acceleration without causing premature shutdown, while protecting the SMPS from overload condition. Green-mode and burst-mode functions with a low operating current maximize the light-load efficiency so that the power supply can meet stringent standby power regulations.
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