+5V to ±18V Boost Converter

[CMOS]

lm2577 sepic

Hi,
Can someone suggest me low cost monolithic boost converters for converting +5V to ±18V, Current required is 500mA.

 

[IanP]

Flyback regulator based on the LM2577-ADJ may be a good candidate for this job ..
Goto page 21+++ and have a look at it ..
**broken link removed**

Regards,
IanP

 

[CMOS]

Do you know any converter without transformer? Any inductor based design will do but transformers of those specs are pretty hard to find.

 

[nguyennam]

MC34063 from ON semiconductor is what you need. You will have to use 1 MC34063 for converting +5V to +18V, 1 for +5V to -18V. Inductors are needed.

nguyennam

 

[CMOS]

MC34063 from ON semiconductor is what you need. You will have to use 1 MC34063 for converting +5V to +18V, 1 for +5V to -18V. Inductors are needed.

nguyennam

Yes I thought of doing the same thing. But if there is any converter with dual ± outputs, it will best suit my requirements.

Thanks

 

[IanP]

Converters with positive and negative outputs are pretty rare and their output currents are usually below 500mA ..

Here is one example:
https://www.linear.com/pc/productDetail.jsp?navId=H0,C1,C1003,C1042,C1031,C1061,P1705

So, if you need 0.5A of (+) and (-) rails most likely you will have to employ two independent switching regulators ..

Regards,
IanP

 

[CMOS]

I think I'll go with the MC34063 solution. Thanks guys.