方案概述

ISL6840是一个PWM控制器，主要用于驱动MOSFET，通过功率变压器实现功率传输与电压转换。电路设计简单、具有效率高、功耗低，可调节频率范围大，主要应用于电源和数据通讯电源、无线基站电源、服务器电源、工业动力系统动、隔离型降压和反激式稳压器。

核心优势

1、具有专为电源转换应用宽范围设计的可调频率，功耗低，PWM电流模式控制，包括升压、反激式、隔离输出配置；

2、峰值电流模式控制有效的处理功率瞬变，并提供固有的过流保护；

3、具有高性能，低工作电流，60μA启动电流，可调的工作频率高达2MHZ，及20ns的高峰值电流驱动能力；

4、采用先进的BICOMS设计与行业标准兼容。

ISL6840

Key Features

1A MOSFET Gate Driver

60µA Start-up Current, 100µA Maximum

25ns Propagation Delay Current Sense to Output

Fast Transient Response with Peak Current Mode Control

Adjustable Switching Frequency to 2MHz

20ns Rise and Fall Times with 1nF Output Load

Trimmed Timing Capacitor Discharge Current for Accurate Deadtime/Maximum Duty Cycle Control

High Bandwidth Error Amplifier

Tight Tolerance Voltage Reference Over Line, Load, and Temperature

Tight Tolerance Current Limit Threshold

Pb-Free Available (RoHS Compliant)

Description

The ISL6840, ISL6841, ISL6842, ISL6843, ISL6844, ISL6845 family of adjustable frequency, low power, pulse width modulating (PWM) current mode controllers is designed for a wide range of power conversion applications including boost, flyback, and isolated output configurations. Peak current mode control effectively handles power transients and provides inherent overcurrent protection.

This advanced BiCMOS design is pin compatible with the industry standard 384x family of controllers and offers significantly improved performance. Features include low operating current, 60µA start-up current, adjustable operating frequency to 2MHz, and high peak current drive capability with 20ns rise and fall times.

Applications

Telecom and Datacom Power

Wireless Base Station Power

File Server Power

Industrial Power Systems

PC Power Supplies

Isolated Buck and Flyback Regulators

Boost Regulators