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MAXREFDES1176: PoE Powered Device and Synchronous 5V/1.4A No-Opto Flyback DC-DC Converter Using the MAX17690, MAX17606, and MAX5969B

MAXREFDES1176

参考设计免责声明 参照  重要声明和免责声明  涵盖参考设计和其他Maxim资源

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 eliminates the need for an optocoupler or auxiliary transformer winding and achieves ±5% output voltage regulation over line, load, and temperature variations. 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 x 3mm TQFN Package
  • -40°C to +125°C Operating Temperature Range

Icon

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 1.4 - 5 7 Isolated Flyback

参数化

输入类型 DC
Vin(Min) 30
Vin(Max) 60
Iout(Max) 1.4
单路/多路输出 -
Vout(V) 5
Pout(W) 7
隔离/非隔离 Isolated
拓扑 Flyback

Maxim设备 (3)

器件号 名称 产品线 购买 设计套件和评估模块
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
MAX17690 60V、无光耦、隔离反激控制器 隔离电源 立即购买 设计套件
MAX17606 副边同步MOSFET驱动器,用于反激转换器 隔离电源 立即购买 设计套件

Maxim设备 (3)

器件号 产品线
保护IC
IEEE 802.3af/at兼容、受电设备接口控制器,集成功率MOSFET
隔离电源
60V、无光耦、隔离反激控制器
隔离电源
副边同步MOSFET驱动器,用于反激转换器

设计资料 (4)

标题 类型 尺寸 日期
maxrefdes1176-schematic PDF 24KB 2019-01-25
TTS MAXREFDES Test Results Template_Rev 0_0318 PDF 385KB 2019-01-25
maxrefdes1176-bom PDF 105KB 2019-01-31
maxrefdes1176-pcb PDF 2MB 2019-01-25
日期 类型
2019-01-25

maxrefdes1176-schematic

(PDF, 24KB)

2019-01-25

TTS MAXREFDES Test Results Template_Rev 0_0318

(PDF, 385KB)

2019-01-31

maxrefdes1176-bom

(PDF, 105KB)

2019-01-25

maxrefdes1176-pcb

(PDF, 2MB)

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