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DI-85 Datasheet(PDF) 1 Page - Power Integrations, Inc. |
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DI-85 Datasheet(HTML) 1 Page - Power Integrations, Inc. |
1 / 2 page D S FB BP J3-1 RTN 6 V, 0.33 A J3-2 L J-1 J-2 N D1 1N4937 RF1* 8.2 Ω 2.5 W C1 10 µF 400 V C2 0.1 µF 50 V L1 3300 µH D4 UF4002 D3 1N4005 C5 220 µF 25 V C3 330 nF 50 V C4* 100 pF 250 VAC *Optional components R3 2 k Ω VR1* 1N5240B 10 V R2 3 k Ω R1 37.4 k Ω T1 EE16 2 1 7 6 4 5 D2 1N4005 90-265 VAC LinkSwitch-LP PI-4106-101105 U1 LNK564P www.powerint.com Design Idea DI-85 LinkSwitch-LP 2 W Charger: Replaces Unregulated Linear Solutions February 2006 DI-85 ® Design Highlights • Low-cost, low parts-count solution: 14-17 components • Proprietary IC design and winding techniques enable a Clampless ™ design with simple Filterfuse™ input stage • ±5% over-temperature threshold – with hysteretic recovery – keeps PCB temperatures below safety limits • Auto-restart: output short circuit and open loop protection • IC creepage distance >3.2 mm: no arcing in high humidity • Easily meets all EPS energy efficiency standards • Meets CISPR-22 Class B EMI with good margin Operation This LinkSwitch-LP based flyback converter (Figure 1) provides an output VI curve (Figure 2) similar to that of an unregulated line frequency transformer based supply, but with output current that is limited past the maximum rated output power (peak power point). From no-load to the 2 W peak power point, the LNK564P (U1) regulates the output voltage by skipping switching cycles, based on the current delivered into the FEEDBACK (FB) pin. At the peak power point, the supply delivers >300 mA of load current at >5.7 VDC. Past the peak power point, cycle skipping ceases and U1 limits the supplyʼs output current by reducing its oscillator (MOSFET switching) frequency, as the voltage on the FB pin drops. If the load demand causes the FB pin voltage to drop below an auto-restart threshold voltage V FB(AR) of 0.8 V (1 V to 1.5 V on the supply output) for more than 100 ms, the IC goes into auto-restart mode. In auto-restart, MOSFET switching is enabled for about 100 ms, approximately every 800 ms, until the FB pin voltage increases above 0.8 V. Due to the frequency jittering of the U1 internal oscillator and the E-Shield™ winding techniques used in constructing the transformer (T1), conducted EMI is adequately attenuated by the LC filter formed by L1 and C1. Inductor L1 serves as both a differential mode choke and a fuse. This Filterfuseis sleeved with heat-shrink tubing, and its winding wire diameter was selected so that it will open like a fuse if any single component fails shorted. Thanks to the tight current limit tolerance of the LinkSwitch-LP family and construction techniques used on T1, the primary winding can be left Clampless, since the peakdrainvoltagedoesnotapproachthe700Vdrain-to-source breakdown voltage (BV DSS) of U1. With no optocoupler and such a low parts count, this supply is cost competitive with the unregulated line frequency transformer based solution it was designed to replace. Application Device Power Output Input Voltage Output Voltage Topology Charger LNK564P 2 W 90-265 VAC 6 V Flyback Figure 1. LNK564 Based 6 V, 330 mA, 2 W, Low-Cost, Flyback Charger Power Supply. |
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