LM73606: Vout error under no load condition

Toshihiro Watanabe

Part Number: LM73606

Hello,

We make 3.3V from 5V by LM73606. When no load condition, Vout is 3.6V. We tried 10 samples. There is samples 3.3V output under no load condition. The ratio is almost 50:50. When load is connected, Vout becomes 3.6V to 3.3V

Would you let us know the reason when Vout is higher than set voltage?

Best regards,

Toshihiro Watanabe

over 6 years ago

0 Arief Hernadi over 6 years ago

TI__Mastermind 23845 points

Hi,

The rise in VOUT voltage is because the part is in Pulse Frequency Mode. MODE pin is grounded

When the MODE pin is pulled up to VCC, the part will operate in FPWM mode in this case frequency is fixed and the VOUT will be regulated at 3.3V.

You can see the difference on Figure 45 and Figure 46 on the datasheet below

http://www.ti.com/lit/ds/symlink/lm73605.pdf#page=34

Thanks

-Arief

Power management

Power management forum

LM73606: Vout error under no load condition