NCP1562中文资料PWM 控制器，高性能，有源箝位/重置数据手册ONSEMI规格书

描述 Description

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. The NCP1562 family reduces component count and system size by incorporating high accuracy on critical specifications such as maximum duty cycle limit, undervoltage detector and overcurrent threshold. Two distinctive features of the NCP1562 are soft-stop and a cycle skip current limit with a time threshold. Softstop circuitry powers down the converter in a controlled manner if a severe fault is detected. The cycle skip detector enables a softstop sequence if a continuous overcurrent condition is present. Additional features found in the NCP1562 include line feedforward, frequency synchronization up to 1.0 MHz, cycle by cycle current limit with leading edge blanking (LEB), independent under and overvoltage detectors, adjustable output overlap delay, programmable maximum duty cycle, internal startup circuit and soft-start.

特性 Features

• Soft-Stop Powers Down Converter in a Controlled Manner
• Eliminates Resonance Between Active Clamp Capacitor and Primary Inductance
• Independent Line Undervoltage and Overvoltage Detectors
• Reduces External components
• Programmable Maximum Volt-Second Product
• Prevents Transformer Saturation
• Programmable Soft-Start
• Reduces Stress During Power Up
• Internal 100 V Startup Circuit
• Eliminates the Need for External Components
• Dual Outputs with Adjustable Overlap Delay
• >2 A Output Drive Capability
• Cycle-by-Cycle Current Limit
• Cycle Skip Initiated if Continuous Current Limit Condition Exists
• Voltage Mode Operation with Input Voltage Feedforward
• Fixed Frequency Operation up to 1 MHz
• Bidirectional Frequency Synchronization
• Accurate Programmable Maximum Duty Cycle
• Precision 5 V Reference

应用 Application

• High power isolated DC/DC converters
• Power supplies
• Desktop / Server PSU
• Telecom base station PSU
• Flat TV PSU

简介

NCP1562属于开发板套件编程器的评估板-DC/DC与AC/DC（离线）SMPS。由制造生产的NCP1562评估板 - DC/DC 与 AC/DC（离线）SMPS该系列产品提供了一种方便的方法，可对开关模式电源转换所用的器件（包括 DC-DC 和 AC-DC 型）进行性能或特性评估。“稳压器”（包含内部电源开关装置）和“控制器”（设计为控制外部电源开关）之类的器件均包括在内。