Welcome to EDAboard.com

Welcome to our site! EDAboard.com is an international Electronic Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.

Register Log in

SEPIC Converter Design 12V/2A

seridj_mse

Newbie
Joined
Jan 18, 2021
Messages
1
Helped
0
Reputation
0
Reaction score
0
Trophy points
1
Activity points
21
hi,

I need a SEPIC converter with the following characteristics

Vin(min) = 11V
Vin(max) = 30V
Vout = 12V
Iout (max) = 2A
f = 100khz - 300khz

found design with LT3759 chip ANALOG DEVICES https://www.analog.com/en/products/lt3759.html#product-overview i dont know if its an high cost design or not and good quality or no too and Analog devices parts are now not used very much in professional design ?

and other think i see some board use regulator like LM2678, LM2596 .... maybe we should ensure that the input voltage is higher than the output but if the input was 12.8v and ouput was 11v its not a problem i can get my 3.3v and 5v from this output ...


Thank you in advance.
 
Last edited:

BradtheRad

Super Moderator
Staff member
Joined
Apr 1, 2011
Messages
13,885
Helped
2,755
Reputation
5,507
Reaction score
2,663
Trophy points
1,393
Location
Minneapolis, Minnesota, USA
Activity points
103,603
Does the topology have to be SEPIC? Did you rule out simpler types?

An obvious example is buck-boost which is able to step up or down. However it produces output at opposite polarity to the incoming supply (relative to ground). If your system requires unchanged polarity, then consider cascading a buck then boost converter.
 

treez

Advanced Member level 5
Joined
Sep 22, 2008
Messages
7,660
Helped
565
Reputation
1,133
Reaction score
542
Trophy points
1,393
Location
cambridge
Activity points
76,763
LT3759 looks ok, but any current mode controller can do a SEPIC.
Perhaps you will pick one which gives you a low dissipation in your source sense resistor.
LTC1871 is another one.
Even UCC28C43.
ti.com do some aswell
and others
 

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Top