Adjustable Voltage Step-down Converter

Posted on Feb 5, 2014

The LinkSwitch-XT LNK363DN based‚ flyback power supply shown in Figure 1 generates a single isolated DC output voltage from a 90 VAC to 264 VAC input voltage range. The power supply output is 5 V, 550 mA (2. 75 W) constant-voltage/constant-current (CV/CC). Typical applications include cell phone chargers, portable Audio players, digital cameras or

Adjustable Voltage Step-down Converter
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other products with a USB charger Interface Diodes D1, D2, D3 and D4, together with capacitors C1 and C2, rectify and smooth the AC input voltage. Differential EMI ltering is provided by C1, C2, L1 and L2. The integrated frequency jitter feature of U1, along with transformer E-Shield techniques, allows such simple EMI ltering to meet compliance with EN55022B, even without a Y-capacitor across the primary to secondary isolation barrier (see Figure 3).

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