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Design highlights, operation, key design points, As the main contents of the document "DI-148 Design Idea PeakSwitch". Invite you to consult the text book for more documents serving the academic needs and research. | DI-148 Design Idea PeakSwitch POWER INTEGRATIONS Multiple Output Flyback Power Supply for Audio Amplifier Using Magnetic Amplifiers to Achieve Better Cross Regulation Application Device Power Output Input Voltage Output Voltage Topology Design Highlights Effectively replaces linear transformer-based power supplies in home audio applications Dramatically reduces weight allowing chassis cost reduction Proprietary magnetic amplifier mag amp approach enables tight cross regulation of two main outputs in flyback topology Low component count compact and light weight. Energy efficiency 82 efficiency at full load 800 mW no-load power consumption at 265 VAC Reduces heat sink requirements and eliminates need for separate standby supply Excellent transient response - improves audio quality Integrated frequency jittering together with a simple EMI filter allows for CISPR-22 EN55022B conducted EMI compliance see Figure 2 Integrated safety reliability features Accurate auto-recovering hysteretic thermal shutdown function maintains safe PCB temperatures under all conditions Latching shutdown protects against output short circuits and open feedback loops Operation The universal input power supply shown in Figure 1 has multiple outputs 26 VDC 15 VDC and 5 VDC. The 26 V outputs can each deliver a minimum output current of 2.42 A peak thermally limited and 1.45 A continuous. Additionally the voltage regulation and importantly transient response is excellent over the entire load range no-load to full load . The controller in U1 skips switching cycles to regulate the output voltage based on feedback to its EN UV pin. When the current pulled out of this pin exceeds 240 pA a low logic level disable is generated. At the beginning of each cycle the EN UV pin state is sampled and if high the power MOSFET is turned on for that cycle enabled otherwise the power MOSFET remains off disabled . During start-up switching is inhibited until the input voltage is above the under-voltage threshold .
