Hello Team,
there is some confusion regarding the possible Vout for TPS546A/B/D24A.
All their datasheets specify on page 1:
and on page 12:
Question: Is it possible to set Vout to 6V?
Thanks and Best Regards,
Hans
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Hello Team,
there is some confusion regarding the possible Vout for TPS546A/B/D24A.
All their datasheets specify on page 1:
and on page 12:
Question: Is it possible to set Vout to 6V?
Thanks and Best Regards,
Hans
Hi Hans,
Peter will look into this and feedback to you soon.
Thanks,
Lishuang
Hans,
The PMBus command is digitally programmable over a range from 0.25V to 6.0V, but the VOSNS pin is only rated for 5.5V so we do not recommend programming the part above 5.5V.
Hi Peter,
thanks for fast reply! If I add a R-divider (e.g. divide by 2) between Vout and VOSNS I don't violate the maximum rating. I just read half of Vout when using READ_VOUT, correct?
In that case I can set Vout to 6V, correct?
Or are there other reasons which prevent this use case, please?
Thanks and Best Regards,
Hans
Hans,
Yes, it would be possible to set the output voltage upto 6V using an external divider, though I would not recommend a 2:1 divider.
You will need to pay careful attention to the input impedance of the VOSNS to GOSNS pins, as that will affect the divider accuracy.
You can set VOUT_SCALE_LOOP to a value less than 0.125 so the part can correct for the external divider along with its internal divider. That will allow both VOUT_COMMAND and READ_VOUT to work correctly.
For example, if you add an external divider 0.8x divider (1R over 4R) and programming VOUT_SCALE_LOOP equal to 0.100, the internal divider will be set to 8:1 (VOUT_SCALE_LOOP < 0.125) but the reference voltage will be set to VOUT_COMMAND x 0.100 and READ_VOUT will report 10x the voltage measured at the 8:1 internal sense voltage, so the part will compensate for the total 10:1 divider.
Using this will allow output voltages up to 6.0V, but output voltages above 6V could saturate the ramp in the PWM modulator and should not be used.