DC - DC converter module, buck

Thread Starter

Vindhyachal Takniki

Joined Nov 3, 2014
480
I need three dc-dc modules which cah below specs:
1. Input: 12V-16.8V
2. Out1: 12V/5A
3. Out2: 12V/3A
4. Out3: 5V/2A


I had looked into net & found that below dc-dc are ok:
http://www.digikey.com/product-search/en?keywords= UWE-12/6-Q12PB-C

http://www.digikey.com/product-search/en?keywords=UWE-12/6-Q12PB-C



1. Problem I see, they are isolated. Can I short its Vin- & Vout-, & will it still work?

2. Do these dc-dc require external heat sinks, or provided system is at room temperature they will work?
In datasheet they have placed additoanl AL baseplate
 

Marley

Joined Apr 4, 2016
332
They have isolated outputs. You can connect Vin- to Vout- no problem
Even though they are quite efficient, some of these very small DC-DC converters get quite hot at full load. No heatsink needed but will need to have ventilation or even a small fan to keep air flowing over them.
 

AnalogKid

Joined Aug 1, 2013
8,251
For outputs 1 and 2 you have no choice but to use isolated converters, because non-isolated buck converters have a minimum voltage drop between the input and output, so you can't get 12 V out with 12 V in. For #3, there are tons of non-isolated buck regulator assemblies/modules at the major distributors, ebay, alibaba, amazon...

ak
 
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