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LNK520P-TL Datasheet(PDF) 7 Page - Power Integrations, Inc. |
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LNK520P-TL Datasheet(HTML) 7 Page - Power Integrations, Inc. |
7 / 20 page 7 LNK520 E 2/05 PI-3723-111303 R1 390 k Ω 1/4 W R3 15 Ω J1 RF1 8.2 Ω 2 W U1 LNK520P C5 220 nF C6 330 µF 16 V C3 1 µF 50 V C1 4.7 µF 400 V D7 11DQ06 D1 1N4005 D3 1N4005 R4 6.81 k Ω 1%, 1/4 W 1 7 6 8T 26T 100T 4 2 RTN 5.5 V, 500 mA 85 - 265 VAC LinkSwitch L1 1 mH 0.15 A L N T1 EE16 LP = 2.52 mH D5 1N4007GP C2 4.7 µF 400 V R2 100 Ω C4 330 pF 1 kV 5 D6B 1N4937 D2 1N4005 D4 1N4005 D S C 100 0 200 300 400 500 600 700 Output Current (mA) 0 1 2 3 4 5 6 7 8 9 10 85 VAC 115 VAC 190 VAC 230 VAC 265 VAC Limits Figure 10. 2.75 W Constant Voltage/Constant Current (CV/CC) Charger Using LinkSwitch. Figure 11. Measured Output Characteristic of the Circuit in Figure 10. The secondary of the transformer is rectified and filtered by D7 and C6 to provide the DC output to the load. LinkSwitch dramatically simplifies the secondary side by controlling both the constant voltage and constant current regions entirely from the primary side. This is achieved by monitoring the primary- side bias voltage. Diode D5, C4, R1 and R2 form the primary clamp network. This limits the peak DRAIN voltage due to leakage inductance. Resistor R2 allows the use of a slow, low cost rectifier diode by limiting the reverse current through D5 when U1 turns on. The selection of a slow diode improves radiated EMI and also improves CV regulation, especially at no-load. |
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