On Semi NCP1562高效350W ATX电源参考设计

On Semi公司的NCP1562系列是高度集成的电压模式控制器,适用于高效率和低元件数的电源设计. NCP1562系列具有两相输出(可调重叠延时):主输出驱动正向转换器初级MOSFET,次输出驱动有源箝位电路MOSFET,次级边同步整流器,或异步半桥电路.输出电流2A,固定工作频率高达1MHz,双向频率同步,内部有100V起动电路和精密的5.0V基准,主要用在通信电源,工业电源转换器,42V汽车系统和ATX电源.本文介绍了NCP1562x系列主要特性,方框图以及高效350W ATX电源参考设计主要指标,详细电路图和相应的材料清单.

The NCP1562x is a family of voltage mode controllers designed for dc--dc converters requiring high--efficiency and low parts count. These controllers incorporate two in phase outputs with an overlap delay to prevent simultaneous conduction and facilitates soft switching. The main output is designed for driving a forward converter primary MOSFET. The secondary output is designed for driving an active clamp circuit MOSFET, a synchronous rectifier on the secondary side, or an asymmetric half bridge circuit.
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