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LNK603 Datasheet(PDF) 4 Page - Power Integrations, Inc. |
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LNK603 Datasheet(HTML) 4 Page - Power Integrations, Inc. |
4 / 18 page Rev. F 01/10 4 LNK603-606/613-616 www.powerint.com Applications Example Circuit Description This circuit shown in Figure 4 is configured as a primary-side regulated flyback power supply utilizing the LNK613DG. With an average efficiency of 74% and <30 mW no-load input power this design easily exceeds the most stringent current energy efficiency requirements. Input Filter AC input power is rectified by diodes D1 through D4. The rectified DC is filtered by the bulk storage capacitors C1 and C2. Inductor L1, C1 and C2 form a pi (π) filter, which attenuates conducted differential-mode EMI noise. This configuration along with Power Integrations transformer E-shield™ technology allow this design to meet EMI standard EN55022 class B with good margin without requiring a Y capacitor, even with the output connected to safety earth ground. Fusible resistor RF1 provides protection against catastrophic failure. This should be suitably rated (typically a wire wound type) to withstand the instantaneous dissipation while the input capacitors charge when first connected to the AC line. LNK 613 Primary The LNK613DG device (U1) incorporates the power switching device, oscillator, CC/CV control engine, startup, and protection functions. The integrated 700 V MOSFET provides a large drain voltage margin in universal input AC applications, increasing reliability and also reducing the output diode voltage stress by allowing a greater transformer turns ratio. The device is completely self-powered from the BYPASS pin and decoupling capacitor C4. For the LNK61X devices, the bypass capacitor value also selects the amount of output cable voltage drop compensation. A 1 mF value selects the standard compensation. A 10 mF value selects the enhanced compensation. Table 2 shows the amount of compensation for each device and bypass capacitor value. The LNK60x devices do not provide cable drop compensation. The optional bias supply formed by D6 and C5 provides the operating current for U1 via resistor R4. This reduces the no-load consumption from ~200 mW to <30 mW and also increases light load efficiency. The rectified and filtered input voltage is applied to one side of the primary winding of T1. The other side of the transformer’s primary winding is driven by the integrated MOSFET in U1. The leakage inductance drain voltage spike is limited by an RCD-R clamp consisting of D5, R2, R3, and C3. Output Rectification The secondary of the transformer is rectified by D7, a 1 A, 40 V Schottky barrier type for higher efficiency, and filtered by C7. If lower efficiency is acceptable then this can be replaced with a 1 A PN junction diode for lower cost. In this application C7 was sized to meet the required output voltage ripple specification without requiring a post LC filter. To meet battery self discharge requirement the pre-load resistor has been replaced with a series resistor and Zener network (R8 and VR1). However in designs where this is not a requirement a standard 1 k W resistor can be used. Output Regulation The LNK613 regulates the output using ON/OFF control in the constant voltage (CV) regulation region of the output character- Figure 4. Energy Efficient USB Charger Power Supply (74% Average Efficiency, <30 mW No-load Input Power). PI-5111-050808 D S FB BP R2 470 k Ω R3 300 Ω R5 13 k Ω 1% R7 200 Ω R8 200 Ω R6 8.87 k Ω 1% R4 6.2 k Ω RF1 8.2 Ω 2 W D5 1N4007 D7 SS14 D6 LL4148 VR1 2MM5230B-7 4.7 V D1 1N4007 D2 1N4007 D3 1N4007 D4 1N4007 T1 EE16 5 10 8 1 2 4 NC 3 C7 680 µF 10 V C6 1 nF 100 V C1 4.7 µF 400 V C2 4.7 µF 400 V C4 1 µF 25 V C5 10 µF 16 V L1 1.5 mH C3 820 pF 1 kV DC Output 5 V, 555 mA U1 LNK613DG LinkSwitch-II AC Input |
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