BQ25504: ultra low power boost converter and energy harvester

Avinash Kumar44

Part Number: BQ25504

I have set my VOV =3.3V And VUV=2.8V I'M getting VRDIV around 300mv I have attached solar panel with VOC =1.2V why is it so .

I'm not able to charge my battery of 3.7V or 3.3 V.

Please help me .

over 7 years ago

0 Upal Patel over 7 years ago

TI__Intellectual 1640 points

Hello Avinash,
What's the ISC of the solar panel?

0 Avinash Kumar44 over 7 years ago in reply to Upal Patel

Prodigy 90 points

In data sheet it shows 450mA but while measuring it shows no ampere reding on ammeter . I changed two solar cell of different cell size with different VOC .

0 Upal Patel over 7 years ago in reply to Avinash Kumar44

TI__Intellectual 1640 points

Thank you for the insight.
Can you try using a power supply? Can you try to supply 1.2V and 100mA of current from the power supply to the input, and check to see if the problem still persists?

0 Avinash Kumar44 over 7 years ago in reply to Upal Patel

Prodigy 90 points

Yes I will try on you suggestion

One querry more I have taken Vbias value as 1.25v am I correct in choosing that value . How can I know that Vbias value .

0 Upal Patel over 7 years ago in reply to Avinash Kumar44

TI__Intellectual 1640 points

The Vbias value is set internally to 1.25V.

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BQ25504: ultra low power boost converter and energy harvester