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MAX17681

更新时间： 2023-12-20 18:45:16
品牌 Logo 应用领域
亚德诺 - ADI DC-DC转换器
页数 文件大小 规格书
19页 749K
描述
4.5V至42V输入、高效、Iso-Buck DC-DC转换器

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中文翻译

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MAX17681 数据手册

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MAX17681  
4.5V to 42V Input, High-Efficiency,  
Iso-Buck DC-DC Converter  
General Description  
Benefits and Features  
● Reduces External Components and Total Cost  
The MAX17681/MAX17681A is a high-voltage, high-  
efficiency, iso-buck DC-DC converter designed to provide  
isolated power up to 5W. The device operates over a  
wide 4.5V to 42V input and uses primary-side feedback  
to regulate the output voltage.  
• No Optocoupler  
• Synchronous Primary Operation  
• All-Ceramic Capacitors, Compact Layout  
● Reduces Number of DC-DC Regulators to Stock  
The MAX17681/MAX17681A uses peak-current-mode  
control. The low-resistance, on-chip MOSFETs ensure  
high efficiency at full load while simplifying the PCB layout.  
• Wide 4.5V to 42V Input  
• 0.9V to 0.96 x V Primary Output Voltage  
IN  
• Delivers Up to 5W Output Power  
The MAX17681/MAX17681A devices generate a well  
regulated primary side voltage which is then scaled by a  
suitable transformer turns ratio to derive isolated secondary  
output rails. While both MAX17681 and MAX17681A  
support primary side overcurrent protection, the  
MAX17681A is an enhanced design that supports robust  
secondary-side overcurrent protection as well.  
● Reduces Power Dissipation  
• Peak Efficiency > 90%  
• 0.9μA (typ) Shutdown Current  
● Operates Reliably in Adverse Industrial Environments  
• Peak and Sink Current-Limit Protection  
• ±1.7% Feedback Accuracy  
• Programmable EN/UVLO Threshold  
• Adjustable Soft-Start  
• Overtemperature Protection  
The MAX17681/MAX17681A is available in a compact  
10-pin (3mm x 2mm) TDFN package. Simulation models  
are available.  
• -40°C to +125°C Operation  
● Short-Circuit Protection  
Applications  
● Isolated Fieldbus Interfaces  
● PLC I/O Modules  
● Smart Meters  
• MAX17681A Supports Robust Secondary-Side  
Short-Circuit Protection  
• MAX17681A Is Recommended for All New Designs  
● Isolated Power Supplies in Medical Equipment  
● Floating Power Supply Generation  
Ordering Information appears at end of data sheet.  
Application Circuit  
T1  
1:2.4  
V
OUT  
D1  
24V, 100mA  
V
IN  
LX  
V
IN  
17V TO 32V  
C1  
1µF  
R4  
49.9Ω  
PGND  
EN/UVLO  
C7  
2.2µF  
N
N
SEC  
PRI  
Z1  
V
CC  
GND  
C3  
MAX17681  
MAX17681A  
1µF  
C2  
10uF  
R1  
105kΩ  
SS  
FB  
C4  
33nF  
R2  
10kΩ  
C8  
1nF  
COMP  
RESET  
R3  
4.75kΩ  
C6  
680pF  
C5  
33nF  
19-7053; Rev 4; 3/18  
1234567...19

中文翻译

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