BQ25505: Vin detect accuracy

Given Ding

Part Number: BQ25505

Hi Team,

To my understanding, the first stage of boost is to achieve MPPT, then Vin of boost is regulated, right? Then Vin sense accuracy is important, what's the accuracy of Vin sense and is Vin sensed by Vin_DC pin? Thanks.

Given

11 months ago

0 Michael Emanuel35 11 months ago

TI__Mastermind 33765 points

Hi Given,

Please see Section 7.3.1, "The boost converter indirectly modulates the input impedance of the main boost charger by regulating the charger's input voltage, as sensed by the VIN_DC pin, to the sampled reference voltage stored on the VREF_SAMP pin." VIN_REG is specified as maximum of 10% in the datasheet.

Regards,

Mike Emanuel

0 Given Ding 10 months ago in reply to Michael Emanuel35

TI__Expert 8365 points

Hi Mike,

Thanks.

How to understand 10% of Vin_REG?

To my understanding, the closed loop control is to compare Vin_DC with Vref_samp, then what's the accuracy of Vin_DC sense? +/-1% or +/-10%? Thanks.

BRs

Given

+1 Michael Emanuel35 10 months ago in reply to Given Ding

TI__Mastermind 33765 points

Hi Given,

The accuracy of the input regulation VIN_REG is +/-10%.

Regards,

Mike Emanuel

Power management

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BQ25505: Vin detect accuracy