Viper 16LD, Non Isolated Buck Regulation issue

[Vamsi Yaram]

Posted on October 26, 2017 at 10:37

The output Voltage expected is 6V and output is constant for 110VAC input. But the output is turning ON/OFF for 220V input. Please let me know to resolve this issue. I have followed the ST Design suite for the design.

#viper16ld #viper16

[Patrizia BELLITTO]

Posted on October 30, 2017 at 10:23

Hello, 

could you please provide the complete specifications?

You speak about a 6V output voltage, but in the schematic the expected value is 5V, and even the output divider is sized for this last value.

Regards,

Patrizia

[Vamsi Yaram]

Posted on October 31, 2017 at 04:14

Complete Spec is Non Isolated Buck Topology with Universal mains 85-265VAC, Expected Output is 5V with 5% voltage regulation.

I have increased to 6V Since there is drop of around 1V from No load to full load voltage. 

As I said the Output @ 110V was steady but @ 220V, voltage was fluctuating as shown in picture.

[Patrizia BELLITTO]

Posted on November 02, 2017 at 10:10

Hello,

we need even the output current, please.

Regards