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隔离型、变压器驱动器,适用于PCMCIA设计

内置功率MOSFET,节省空间,可提供750mW功率

产品详情

主要特征

应用/用途

Parametric specs for Transformer Drivers
VIN (V) (min) 2.5
VIN (V) (max) 6
Driver Output Resistance (Ω) (max) 4
Max. IOUT (A) 0.2
Topology Push-Pull
Switching Frequency (kHz) 860
ICC (mA) (max) 1.1
Package/Pins SOIC (N)/8
UMAX/8
Oper. Temp. (°C) -40 to +85
Budgetary
Price (See Notes)
2.48
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参量

Parametric specs for Transformer Drivers
VIN (V) (min) 2.5
VIN (V) (max) 6
Driver Output Resistance (Ω) (max) 4
Max. IOUT (A) 0.2
Topology Push-Pull
Switching Frequency (kHz) 860
ICC (mA) (max) 1.1
Package/Pins SOIC (N)/8
UMAX/8
Oper. Temp. (°C) -40 to +85
Budgetary
Price (See Notes)
2.48

主要特征

  • Transformer Driver for Ultra-Thin 5V-µs Transformers
  • Isolated DC-to-DC Power Supply for PCMCIA Applications
  • 450kHz Minimum Switching Frequency
  • Ultra-Low Input Supply Current Ripple
  • Single +5V or +3.3V Supply
  • 5µW Low-Power Shutdown Mode
  • 8-Pin SO and µMAX Packages
  • Low Output Ripple Permits Miniature Output Capacitors

应用/用途

  • 桥接地电位差
  • 隔离型数据采集
  • 隔离型接口供电
  • 低功耗LAN网络
  • 医疗装置
  • 噪声抑制通信接口
  • PCMCIA调制解调器卡
  • 过程控制

描述

The MAX845 provides an isolated power supply small enough to fit in thin PCMCIA cards and space-sensitive applications. It drives a low-profile center-tapped transformer primary from a 5V or 3.3V DC power supply. The secondary can be wound to provide any isolated positive or negative voltage at powers up to 750mW.

The MAX845 consists of an oscillator followed by a toggle flip-flop. The flip-flop generates two 50% duty-cycle square waves, which are complementary at half the oscillator frequency (450kHz, min). These two signals drive the ground-referenced N-channel power switches. Internal circuitry ensures break-before-make action between the two switches.

A low-power shutdown disables both the switches and the oscillator, reducing power consumption. An evaluation kit (MAX845EVKIT-MM) is available to evaluate low-profile 5V 40mA and 5V 100mA applications.

简化框图

MAX845:典型工作电路 MAX845:典型工作电路 Zoom icon

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在Maxim的知识库中搜索技术问题的答案

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Maxim的专业工程师团队也会为您解答相应的技术问题,请访问Maxim的 支持中心