器件名称: DI-89
功能描述: Low Cost 2 W CV Power Adapter
文件大小: 469.36KB 共2页
简 介:CV Power Adapter
Application Adapter Device LNK362P
Design Idea DI-89 LinkSwitch-XT Low Cost 2 W
Power Output 2W Input Voltage 85-265 VAC Output Voltage 6.2 V Topology Flyback
Design Highlights
Low-cost, low parts-count CV solution: 20 components Proprietary IC design and winding techniques enable a Clampless drain-node ± 5% over-temperature threshold – with hysteretic recovery – keeps PCB temperatures below safety limits Auto-restart: output short circuit and open loop protection IC creepage > 3.2 mm: no arcing in humid environments Easily meets all EPS energy efciency standards Meets CISPR-22 Class B EMI with sufcient margin
the ringing of the lter. Switching frequency jitter and PIs E-Shield transformer construction technology enable this design to meet EN55022 Class-B conducted EMI with good margin (see Figure 4). Y capacitor C4 (optional) can improve the unit-to-unit repeatability of EMI scans. This supply also takes advantage of PIs Clampless transformer techniques, which uses T1s primary winding capacitance to clamp the voltage spike that its leakage inductance causes, each time the MOSFET in U1 turns off. Therefore, this converter has no primary clamp components connected to the drain-node. From no-load until maximum output power (2 W) is delivered, the LNK362P (U1) regulates the output voltage by skipping switching cycles, based on the current delivered into the feedback (FB) pin. If the output is over loaded and no feedback (< 49 A) is received within a 4……
