器件名称: DI-66
功能描述: 45 W, Universal Input, LCD Monitor Internal Supply
文件大小: 497.69KB 共2页
简 介:Design Idea DI-66 TOPSwitch-GX 45 W, Universal Input,
LCD Monitor Internal Supply
Application LCD Monitor Device TOP246Y/F Power Output 45 W Input Voltage 90-265 VAC Output Voltage 5 V / 12 V Topology Flyback
Design Highlights
66 kHz operation enables 0.45 W of standby output power delivery with 0.9 W of input power at 230 VAC Low no-load input power: <0.42 W at 230 VAC 82% efficient (min) at 90 VAC input and 45 W output Low component count: only 52 parts! Meets CISPR22 B EMI with > 10 dB of margin No TVS required for the primary snubber
Operation
Many of the built-in features of TOPSwitch-GX, such as line UV/OV, soft start, line feed-forward, accurate current limit, and frequency jitter have been used to reduce the component count, transformer size and overall system cost of this universal input, flyback power supply. This design is ideal for LCD monitor supplies that require low standby power consumption.
The switching frequency of U1 is set to 66 kHz by connecting its F pin to the CONTROL pin. Efficient 66 kHz operation results from the use of an EER3016S core to keep the number of primary turns low and to further reduce T1 leakage inductance. This reduces the losses due to both leakage inductance and winding capacitance. Low leakage inductance also allows the use of a low cost RCD snubber (C3, R2–R4 and D5) to clamp the U1 DRAIN voltage, while keeping standby power consumption low. Use of a glass-passivated normal recovery diode (D5) recycles the stored leakage ……
