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MAXREFDES1249: Miniature Universal Input 36W AC-DC Flyback Converter using the MAX17595

MAXREFDES1249

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

Flyback converters are the preferred topology in the SMPS (switched-mode power supply) for medium- and low-power range applications because they are simple and economic. They have less components and are efficient in isolating the output from input. They are used in battery-powered applications, universal AC/DC converters, and industrial and telecommunication equipment. Isolated converters traditionally regulate the output voltage and current by utilizing a secondary side regulation (SSR) composed of an optocoupler and secondary error amplifier.

The MAXREFDES1249 is a universal input (86V to 305V AC) offline-isolated power supply that works across all geographical regions. It delivers 36W DC at 48V suitable for Power over Ethernet (PoE) and telecommunication applications.

The design uses a MAX17595 peak-current-mode controller operated in the discontinuous conduction mode (DCM) of the flyback topology. The architecture efficiently regulates the output by utilizing the feedback network and current-sense, and controlling the duty cycle of the switching MOSFET (metal-oxide semiconductor field-effect transistor) for compact and cost-effective power conversion.

特征

  • Programmable frequency dithering for a low-EMI (electromagnetic interference) spread-spectrum operation
  • Programmable switching frequency optimizes the magnetic and filter components for compact, cost-effective, and efficient isolated/non-isolated power supplies
  • Isolation of 4000V AC between the primary and secondary sides
  • EMI and EMC (electromagnetic compatibility) compliant design
  • Programmable input enable/UVLO (undervoltage lockout) feature
  • Programmable input overvoltage protection
  • Adjustable soft-start
  • Hiccup-mode, short-circuit protection
  • Fast cycle-by-cycle peak current limit
  • Thermal shutdown protection
  • Space-saving, 16-pin, 3mm x 3mm TQFN (thin quad flat no-leads) package
  • Operating temperature range of -40°C to +125°C

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设计, 制作, 测试

图中的电路板已经完成封装和测试。不可售。

 

示意图

PCB布局

物料清单(BOM)

试验结果

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
AC 85 305 0.75 - 48 36 Isolated Flyback

参数化

输入类型 AC
Vin(Min) 85
Vin(Max) 305
Iout(Max) 0.75
单路/多路输出 -
Vout(V) 48
Pout(W) 36
隔离/非隔离 Isolated
拓扑 Flyback

Maxim设备 (1)

器件号 名称 产品线 购买 设计套件和评估模块
MAX17595 峰值电流模式控制器,用于构建反激和boost稳压器 隔离电源 立即购买 Design Kits

Maxim设备 (1)

器件号 产品线
隔离电源
峰值电流模式控制器,用于构建反激和boost稳压器

设计资料 (4)

标题 类型 尺寸 日期
MAXREFDES1249 BOM CSV 6KB 2020-11-03
MAXREFDES1249 Schematic PDF 27KB 2020-11-03
MAXREFDES1249 PCB PDF 826KB 2020-11-03
MAXREFDES1249 Test Results PDF 318KB 2020-11-03
日期 类型
2020-11-03

MAXREFDES1249 BOM

(CSV, 6KB)

2020-11-03

MAXREFDES1249 Schematic

(PDF, 27KB)

2020-11-03

MAXREFDES1249 PCB

(PDF, 826KB)

2020-11-03

MAXREFDES1249 Test Results

(PDF, 318KB)

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