On Semi NCP1351 40W打印机电源解决方案
On Semi公司的NCP1351是电流模式控制器,主要用在小功率离线反激开关电源(SMPS),由于采用固定峰值电流技术,在轻负载时控制器可降低开关频率,使得无负载功耗极低,从而优化了其它负载时的开关频率,使得峰值电流降低大概30%.主要用在辅助电源,打印机,游戏机和低成本适配器和离线电池充电器.本文介绍了NCP1351主要特性,四种类型框图,以及应用电路,40W打印机电源16V/32V评估板电路图,材料清单和PCB设计图.
The NCP1351 is a current-mode controller targeting low poweroff-line flyback Switched Mode Power Supplies (SMPS) where costis of utmost importance. Based on a fixed peak current technique(quasi-fixed TON), the controller decreases its switching frequency asthe load becomes lighter. As a result, a power supply using theNCP1351 naturally offers excellent no-load power consumption,while optimizing the efficiency in other loading conditions. When thefrequency decreases, the peak current is gradually reduced down to approximately 30% of the maximum peak current to preventtransformer mechanical resonance. The risk of acoustic noise is thusgreatly diminished while keeping good standby power performance.
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