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MAXREFDES1091: Miniature, 12V/250mA, No-Opto Flyback DC-DC Converter with 91% Efficiency Reference Design Using MAX17690

MAXREFDES1091

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描述

Due to its simplicity and low cost, the flyback converter is the preferred choice for low-to-medium isolated DC-DC power-conversion applications. However, the use of an optocoupler or an auxiliary winding on the flyback transformer for voltage feedback across the isolation barrier increases the number of components and design complexity. 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.

特征

  • 4.5V 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

maxrefdes1091

  • maxrefdes1091
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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

schematic

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物料清单(BOM)

pcb-layout

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PCB布局

design-files

Download PCB Layout

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 18 60 0.25 - 12 3 Isolated Flyback

参数化

输入类型 DC
Vin(Min) 18
Vin(Max) 60
Iout(Max) 0.25
单路/多路输出 -
Vout(V) 12
Pout(W) 3
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
MAX17690 60V、无光耦、隔离反激控制器 隔离电源 立即购买 Design Kits

Maxim设备 (1)

器件号 产品线
隔离电源
60V、无光耦、隔离反激控制器

设计资料 (3)

标题 类型 尺寸 日期
maxrefdes1091-schematic PDF 18KB 2019-07-09
maxrefdes1091-bom XLSX 39KB 2019-07-09
maxrefdes1091-pcb PDF 2MB 2019-07-09
日期 类型
2019-07-09

maxrefdes1091-schematic

(PDF, 18KB)
2019-07-09

maxrefdes1091-bom

(XLSX, 39KB)
2019-07-09

maxrefdes1091-pcb

(PDF, 2MB)

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