DC DC converter problem (loading problem)

[praveen]

Hello,

I have designed a power supply for 3.3V/5V from 30V using the Semtech
DC DC converter(SC2442H).I have taken the reference schematics given
from semtech. The problem is the under no load condition i am getting
required 3.3V and 5V voltage but when i start loading the voltage
starts to decrease. I have designed the pwer supply for 3.3V/3A and
5V/2A. Decrease is very Drastic for example 5V become 4.5V for just
10mA load. Can someone point out how can i debug it. Any suggestion
will be very much appreciated.I need help from you people.Where am i
going wrong?


Thanks and waiting for reply
Praveen

 

[yigiter]

what is your working plane? a breadboard or a pcb? if you work on a
breadboard it may cause the problems like yours. try it on a pcb using
adequate track widths?

 

[Mark Jones]

yigiter wrote:

what is your working plane? a breadboard or a pcb? if you work on a
breadboard it may cause the problems like yours. try it on a pcb using
adequate track widths?

And can you call Semtech? Perhaps they have an engineer that can
help you directly.

-M