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LNK64K-V Datasheet(PDF) 11 Page - Power Integrations, Inc. |
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LNK64K-V Datasheet(HTML) 11 Page - Power Integrations, Inc. |
11 / 24 page Rev. C 03/14 11 www.powerint.com LinkSwitch-HP Figure 14. Layout for LCD Monitor Supply Using eDIP-12B Package. Figure 13. 17 W LCD Monitor Supply (+18 V, +5 V). Layout Considerations for eDIP-12B package The schematic extract in Figure 13 is an example of LinkSwitch-HP used in a dual output LCD monitor supply using eDIP-12B package. In this design the exposed metal tab on the topside of package is left open (no heat sink). The SOURCE pins of LinkSwitch-HP provide heat sinking through connection to the source copper pad of PCB. This technique is adequate for device dissipation up to 0.85 W (1/2 square inch of copper area required). The layout guidelines described for eSIP-7C are the same for eDIP-12B with an added consideration about sensitive component layout. The return referenced components C4, C8, C16, R9, R7 must be placed directly under the LinkSwitch-HP package as shown in Figure 14. This requires that these particular components be SMD type as this allows an ideal noise-immune layout. Output Power Table Assumptions • 12 V output. • Schottky rectification. • 82% efficiency. • V OR = 135 V. • K P = 0.4 for 85-265 VAC input and KP = 0.6 for 195-265 VAC input. • V MIN = 100 V for 85-265 VAC input and VMIN = 250 V for 195-265 VAC input. • 0.85 W device dissipation for open frame designs with PCB heat sink. Quick Design Checklist All LinkSwitch-HP designs should be verified on the bench particularly for specified worst-case stress conditions. The following set of tests are strongly recommended: 1. Maximum drain voltage – Verify that VDS does not exceed 675 V for LNK677X series and 600 V for LNK6X6X series. This gives a 50 V margin for design variations. 2. Under all conditions, the maximum Drain current should be below the specified absolute maximum ratings. 3. Thermal check – At rated maximum output power, minimum input voltage and maximum ambient temperature, verify that the maximum allowed temperature is not exceeded for any component in the design. Of particular importance is checking the temperature rise of the major power conversion components such as transformer, output diodes, input bridge, primary clamp circuit and LinkSwitch-HP. Under the stated conditions above, LinkSwitch-HP tab temperature should not exceed 110 °C. PI-6860-120312 C9 1 nF 250 VAC VR1 P6KE130A 130 V L1 10 mH BR1 DF06M 600 V C2 47 µF 450 V D2 BAV21WS- 7-F D1 DL4937 C6 22 µF 25 V C8 100 pF 50 V C16 10 pF 50 V C7 100 nF 25 V C3 10 nF 630 V C12 220 µF 35 V C10 470 pF 200 V D4 B340LB-13-F D3 30BQ100PBF C15 470 pF 200 V C11 220 µF 35 V C14 820 µF 6.3 V T1 EF25 C13 820 µF 6.3 V C5 4.7 µF 10 V L2 Ferrite Bead (3.5 × 4.45 mm) 3 9,10 7,8 12 6 5 1 C1 100 nF 310 VAC RT1 5 Ω F1 2 A tO 90 - 265 VAC 18 V, 0.67 A J2-6 5 V, 1A J2-1 J1-3 J1-1 RTN J2-4 LinkSwitch-HP D S FB BP CP PD CONTROL U1 LNK6774V R8 46.4 k Ω 1% 1/16 W R6 23.2 k Ω 1% 1/16 W R7 100 k Ω 1% 1/16 W R13* R5 6.98 k Ω 1% 1/8 W R10 10 Ω 1% 1/8 W R4 20 Ω 1% R3 100 Ω 1% R2 100 Ω 1% R1 3 k Ω R12 10 Ω 1% 1/8 W R11 36 k Ω 1/8 W R9 10.5 k Ω 1% 1/16 W C4* *Optional PI-6860-120312 |
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