OnSemi NPC1562 100W，48V，DC/DC转换器参考设计方案
OnSemi公司的NCP1562是一款高效、外围器件少的DC/DC电压模式转换控制器芯片。控制器包含两同相输出，通过一个重叠延迟来保护同时导通，有力于软开关。主输出主要驱动初级前向转换MOSFET。次输出主要驱动有源钳位电路MOSFET，次级主要由一个同步整流器或由一个半桥电路组成。NCP1562与众不同的特性是软停止和时间阀值内循环跳跃电流限制。软停止控制方式是在检测到有严重的故障时，软停止电路系统停止对转换器供电。循环跳跃电流限制方式是在连续出现过流故障时，循环跳跃检测器使能连续软停止。本文主要介绍了该芯片的主要特性及功能强大的保护特性，并给出芯片内部框图、方案介绍、方案原理图、方案PCB图及元器件列表。
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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