DI-148 Design Idea PeakSwitch

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DI-148 Design Idea PeakSwitchDI-148 Design Idea ®PeakSwitchMultiple Output Flyback Power Supply for Audio AmplifierUsing Magnetic Amplifiers to Achieve Better Cross Regulation Application Device Power Output Input Voltage Output Voltage Topology Audio PKS607YN 75 W, 126 W Peak 195 - 265 VAC ±26 V, ±15 V, 5 V FlybackDesign Highlights Operation• Effectively replaces linear transformer-based power supplies in The universal input power supply shown in Figure 1 has multiple home audio applications outputs, ±26 VDC, ±15 VDC, and +5 VDC. The ±26 V outputs• Dramatically reduces weight, allowing chassis cost reduction can each deliver a minimum output current of 2.42 A peak (ther-• Proprietary magnetic amplifier (mag amp) approach enables mally limited) and 1.45 A continuous. Additionally, the voltage tight cross regulation of two main outputs in flyback topology regulation and, importantly, transient response is excellent over the• Low component count, compact and light weight. entire load range (no-load to full load).• Energy efficiency • >82% efficiency at full load The controller in U1 skips switching cycles to regulate the output • 25 μA flows into the EN/UV pin. • Accurate, auto-recovering, hysteretic thermal shutdown func- tion maintains safe PCB temperatures under all conditions • Latching shutdown protects against output short circuits and open feedback loops C9 2.2 nF R16 C23 15 V, 150 mA 68 7 250 VAC 1/2 W 330 pF C27 IN OUT IN OUT 47 MF IN OUT 5 V, 150 mA 1 U5 10 V U8 12 U6 LM7915 UA7815 LM78L05 -15 V, 150 mA D7-8,D16-17 C6 VR1 D6 GND 1N4007 P6KE91A GND GND C7 470 pF UF4002 R52 C13 C20 4700pF 1 kV 2,3 68 k7 L2 330 MF 680 nF ...