Continue to Site

Welcome to our site!

Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.

  • Welcome to our site! Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.

SMPS Output Voltage drop When Load Connected to it

Status
Not open for further replies.

Venkateszr

New Member
Newly designed 5v 1A smps output drop 200mA load connected to it. No load condition it show 5v. When load is connected drop to 3v.
How to fix it?
P1&P2_Input 240v AC
P3&P4_Primary Winding
P6&P5_Auxiliary winding
P7&P8_Secondary Winding
P9&P10_Filter capacitor 10uf,400v
P11&P12_Output 5v 1A
Switching IC is AP8012 Not VIPER 22A
Circuit Attached here
 

Attachments

  • Schematic_SMPS-V2.0_Sheet-1_20181031180736.png
    Schematic_SMPS-V2.0_Sheet-1_20181031180736.png
    74.1 KB · Views: 150
That is really hard to say without knowing the parameters of your transformer.
 
The TL432 looks to be connected backwards?
It has anode to negative & cathode to positive, according to the diagram.

Edit - ignore that; it appears to use zener diode terminology so cathode is positive..
 
Not on the schematic, but in the text, there is a 10uf cap P9-P10.
Are you certain the phase is right on all the windings of the transformer?
Do you have a oscilloscope?
It is hard to trouble shoot because it is not safe on the left half of the schematic.
I have a 0-400V 1.5A power supply, (current limited). P1-P2 that makes it safe to connect a oscilloscope.
1541080093390.png
 
Status
Not open for further replies.

Latest threads

New Articles From Microcontroller Tips

Back
Top