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MAXREFDES1010: 24V/300mA, No-Opto Isolated Flyback DC-DC Converter Reference Design

MAXREFDES1010

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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.

An isolated no-opto flyback DC-DC converter using the MAX17690 is demonstrated for a 24V DC output application. The power supply delivers up to 300mA at 24V.

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℃ to +125℃ Operating Temperature Range

Icon

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)

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 19 40 0.3 - 24 7.2 Isolated Flyback

参数化

输入类型 DC
Vin(Min) 19
Vin(Max) 40
Iout(Max) 0.3
单路/多路输出 -
Vout(V) 24
Pout(W) 7.2
隔离/非隔离 Isolated
拓扑 Flyback

设计资料 (3)

标题 类型 尺寸 日期
maxrefdes1010-schematics PDF 50KB 2019-07-09
maxrefdes1010-pcb PDF 2MB 2019-07-09
6494_MAXREFDES1010_max17690_bom_apps_p1 PDF 217KB 2019-07-09
日期 类型
2019-07-09

maxrefdes1010-schematics

(PDF, 50KB)

2019-07-09

maxrefdes1010-pcb

(PDF, 2MB)

2019-07-09

6494_MAXREFDES1010_max17690_bom_apps_p1

(PDF, 217KB)

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