PMP40766: How this CC/CV mode works

satyendra patel

Prodigy 30 points

Part Number: PMP40766
Other Parts Discussed in Thread: TL103W

Can anyone explain how the CC and CV mode works in the reference design?

At Vbias point we get a voltage of 2.5V approx. And Vref is 7.3V aprrox.

How this opamp U7A works in CV mode?

4 months ago

0 Benjamin Lough 4 months ago

TI__Mastermind 26645 points

Hi Satyendra,

TL103W actually has an internal 2.5V reference. That is what is used for the CV regulation point.

Best Regards,

Ben Lough

+1 satyendra patel 4 months ago in reply to Benjamin Lough

Prodigy 30 points

IF TL103W has internal 2.5V ref. Then this voltage divider is given to Vref and Iref on what purpose and Why?

+1 Benjamin Lough 4 months ago in reply to satyendra patel

TI__Mastermind 26645 points

Hi Satyendra,

R57, R58 and R59 form a divider to provide a reference voltage for the CC loop (Iref = ~1.75V). Vref is using the internal 2.5V reference. R56 is for providing the proper bias current to keep the internal 2.5V reference stable. You can refer to page 12 of the TL103W datasheet where this requirement is explained. The design example within the datasheet also shows this pullup resistor and goes through the calculations for sizing the pullup.

Best Regards,

Ben Lough

0 satyendra patel 4 months ago in reply to satyendra patel

Prodigy 30 points

What is the role of this diodeD13/14/15/16 used in the voltage and current circuit?

0 Benjamin Lough 4 months ago in reply to satyendra patel

TI__Mastermind 26645 points

Hi Satyendra,

It's for additional soft start time.

Best Regards,

Ben Lough

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PMP40766: How this CC/CV mode works