The power supply shown in Figure above uses a LinkSwitch-TN device in a low side buck converter configuration to deliver a constant current of 130 mA at a voltage of 70 VDC. The supply provides an ideal solution for driving LEDs that should be driven with a constant current rather than a constant voltage source.Fuse F1 provides catastrophic failure protection. Capacitor C1 and common mode choke L1 reduce conducted EMI. Diodes D1 through D4 provide full wave rectifi cation while high voltage capacitor C2 maintains a steady DC bus voltage.
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