MAX1856 - 宽输入范围、可同步的、PWM SLIC电源

MAX1856是Maxim美信半导体公司的一款DC-DC开关调节器产品，MAX1856是宽输入范围、可同步的、PWM SLIC电源，本站介绍了MAX1856的封装应用图解、特点和优点、功能等，并给出了与MAX1856相关的Maxim元器件型号供参考。

MAX1856 - 宽输入范围、可同步的、PWM SLIC电源 - DC-DC开关调节器 - Maxim美信半导体高性能芯片品质 - 美信半导体

产品概述

The MAX1856 offers a low-cost solution for generating a SLIC (ringer and off-hook) power supply. Using standard off-the-shelf transformers from multiple vendors, the MAX1856 generates various output voltages: -24V and-72V (dual output) for both ringer and off-hook supplies for voice-enabled broadband consumer premises equipment (CPE), -48V for IP phones and routers, -5V and -15V (single or dual output) for DSL CO line drivers, or negative voltages as high as -185V for MEMS bias supplies. The output voltages are adjusted with an external voltage divider.

Due to its wide operating voltage range, the MAX1856 operates from a low-cost, unregulated DC power supply for cost-sensitive applications like xDSL, cable modems, set-top boxes, LMDS, MMDS, WLL, and FTTH CPE. The MAX1856 provides low audio-band noise for talk battery and a sturdy output capable of handling the ring trip conditions for ring battery.

The operating frequency can be set between 100kHz and 500kHz with an external resistor in free-running mode. For noise-sensitive applications, the MAX1856's operating frequency can be synchronized to an external clock over its operating frequency range.

The flyback topology allows operation close to 50% duty cycle, offering high transformer utilization, low ripple current, and less stress on input and output capacitors. Internal soft-start minimizes startup stress on the input capacitor, without any external components.

The MAX1856's current-mode control scheme does not require external loop compensation. The low-side current-sense resistor provides accurate current-mode control and overcurrent protection.

关键特性

以下关键特性由Maxim美信半导体提供：

Low-Cost, Off-the-Shelf Transformer

3V to 28V Input Range

Low Audio-Band Noise on Talk Battery

Effectively Handles Ring Trip Transients

Powers 2-, 4-, or 12-Line Equipment

High Efficiency Extends Battery Life During Life-Line Support Conditions

Adjustable 100kHz to 500kHz Switching Frequency

Clock Synchronization

Internal Soft-Start

Current-Mode PWM and Idle Mode™ Control Scheme

Logic-Level Shutdown

10-Pin µMAX Package

热门应用

电缆与DSL调制解调器

CO DSL线驱动器电源

FTTH

工业电源

LMDS/MMDS

MEMS偏置电源

路由器/交换机

机顶盒

VoIP振铃与摘机电压发生器

无线本地环路(WLL)

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