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LNK364GN-TL Datasheet(PDF) 4 Page - Power Integrations, Inc. |
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LNK364GN-TL Datasheet(HTML) 4 Page - Power Integrations, Inc. |
4 / 16 page 4 LNK362-364 2-4 Rev. E 11/08 4 Applications Example A 2 W CV Adapter The schematic shown in Figure 5 is a typical implementation of a universal input, 6.2 V ±7%, 322 mA adapter using LNK362. This circuit makes use of the Clampless technique to eliminate the primary clamp components and reduce the cost and complexity of the circuit. The EcoSmart features built into the LinkSwitch-XT family allow this design to easily meet all current and proposed energy efficiency standards, including the mandatory California Energy Commission (CEC) requirement for average operating efficiency. The AC input is rectified by D1 to D4 and filtered by the bulk storage capacitors C1 and C2. Resistor RF1 is a flameproof, fusible, wire wound type and functions as a fuse, inrush current limiter and, together with the π filter formed by C1, C2, L1 and L2, differential mode noise attenuator. Resistor R1 damps ringing caused by L1 and L2. This simple input stage, together with the frequency jittering of LinkSwitch-XT, a low value Y1 capacitor and PI’s E-Shield™ windings within T1, allow the design to meet both conducted and radiated EMI limits with >10 dBμV margin. The low value of CY1 is important to meet the requirement for a very low touch current (the line frequency current that flows through CY1) often specified for adapters, in this case <10 μA. The rectified and filtered input voltage is applied to the primary winding of T1. The other side of the primary is driven by the integrated MOSFET in U1. No primary clamp is required as the low value and tight tolerance of the LNK362 internal current limit allows the transformer primary winding capacitance to provide adequate clamping of the leakage inductance drain voltage spike. The secondary of the flyback transformer T1 is rectified by D5, a low cost, fast recovery diode, and filtered by C4, a low ESR capacitor. The combined voltage drop across VR1, R2 and the LED of U2 determines the output voltage. When the output voltage exceeds this level, current will flow through the LED of U2. As the LED current increases, the current fed into the FEEDBACK pin of U1 increases until the turnoff threshold current (~49 μA) is reached, disabling further switching cycles of U1. At full load, almost all switching cycles will be enabled, and at very light loads, almost all the switching cycles will be disabled, giving a low effective frequency and providing high light load efficiency and low no-load consumption. Resistor R3 provides 1 mA through VR1 to bias the Zener closer to its test current. Resistor R2 allows the output voltage to be adjusted to compensate for designs where the value of the Zener may not be ideal, as they are only available in discrete voltage ratings. For higher output accuracy, the Zener may be replaced with a reference IC such as the TL431. Figure 5. 2 W Universal Input CV Adapter Using LNK362. D S FB BP D1 1N4005 D2 1N4005 D5 1N4934 PI-4162-110205 D3 1N4005 D4 1N4005 RF1 8.2 Ω 2.5 W R1 3.9 k 1/8 W R3 1 k 1/8 W R2 390 Ω 1/8 W 6.2 V, 322 mA 85-265 VRMS J3 J4 J2 J1 L1 1 mH L2 1 mH C1 3.3 μF 400 V C2 3.3 μF 400 V CY1 100 pF 250 VAC C4 330 μF 16 V VR1 BZX79- B5V1 5.1 V, 2% T1 EE16 4 5 3 9 8 NC NC C3 100 nF 50 V U2 PC817A U1 LNK362P LinkSwitch-XT |
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