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MAXREFDES1177: PoE Powered Device and 12V/600mA No-Opto Flyback DC-DC Converter Using the MAX17690 and MAX5969B

MAXREFDES1177

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描述

Power over Ethernet (PoE) is a technology that allows network cables to deliver power to a powered device (PD) through power-sourcing equipment (PSE) or midspan, and has many advantages over traditional methods of delivering power. PoE allows power and data to be combined, removing the need for altering the AC mains infrastructure and can be installed by non-electricians. PoE is an intelligent system designed with protection at the forefront, preventing overload, underpowering, and installation errors, while allowing simple scalability and reliability.

The MAX17690 implements an innovative algorithm to accurately determine the output voltage by sensing the reflected voltage across the primary winding during the flyback time interval. By sampling and regulating this reflected voltage when the secondary current is close to zero, the effects of secondary-side DC losses in the transformer winding, the PCB tracks, and the rectifying diode on output voltage regulation can be minimized. The MAX17690 also compensates for the negative temperature coefficient of the rectifying diode.

Key Features

  • IEEE 802.3af/at Compliance
  • Thermally Enhanced, 3mm × 3mm, 10-Pin TDFN Package (MAX5969B)
  • 30V to 60V Input Voltage Range
  • Programmable Switching Frequency from 50kHz to 250kHz
  • Programmable Input Enable/UVLO Feature
  • Programmable Input Overvoltage Protection
  • Adjustable Soft-Start
  • 2A/4A Peak Source/Sink Gate Drive Capability
  • Hiccup Mode Short-Circuit Protection
  • Fast Cycle-by-Cycle Peak Current Limit
  • Thermal Shutdown Protection
  • Space-Saving, 16-Pin, 3mm × 3mm TQFN Package
  • -40°C to +125°C Operating Temperature Range

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设计,建造,测试

图中的电路板已完全组装并经过测试。不可出售。

参数化

输入类型 Vin(Min) Vin(Max) Iout(Max) 单路/多路输出 Vout(V) Pout(W) 隔离/非隔离 拓扑
DC 30 60 0.6 - 12 7.2 Isolated Flyback

参数化

输入类型 DC
Vin(Min) 30
Vin(Max) 60
Iout(Max) 0.6
单路/多路输出 -
Vout(V) 12
Pout(W) 7.2
隔离/非隔离 Isolated
拓扑 Flyback

Maxim设备 (2)

器件号 名称 产品线 购买 设计套件和评估模块
MAX17690 60V、无光耦、隔离反激控制器 隔离电源 立即购买 设计套件
MAX5969B IEEE 802.3af/at兼容、受电设备接口控制器,集成功率MOSFET 保护IC 立即购买 设计套件

Maxim设备 (2)

器件号 产品线
隔离电源
60V、无光耦、隔离反激控制器
保护IC
IEEE 802.3af/at兼容、受电设备接口控制器,集成功率MOSFET

设计资料 (6)

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