TPSM846C23: VOUT_MODE

SATHYA SHREE S

Part Number: TPSM846C23

Tool/software:

Hi,

We are using TPSM846C23MOLR power supply in our design with PMbus commands. We need the output voltage increments within 5mV.

We want to know the step size and resolution of the regulator and can we change the step size from factory set value? How many bit DAC is available in the regulator?

Is the vout mode register denotes step size and also the exponent(-9) how it is provided?

Thanks

S Sathya shree

4 months ago

0 Eileen Hernandez Hernandez 4 months ago

TI__Expert 5328 points

Hi Sathya,

Yes VOUT_MODE denotes the step for VOUT_COMMAND and any other VOUT related commands. This command is a Read Only type command and therefore can't be changed. The command is set as a linear mode with an exponent = -9 , which would equate to a step size of 2^-9 = 0.001953125V or if rounded 1.953 mV/count. Command has 8 bits total, 3 to set linear mode 000 and then 5 bits that set the exponent 10111 (-9)

Based on those conditions you could account for 3 steps (3x1.953=5.859), that is as close to your 5mV desired step that we can get with the preset settings of the device.

Regards,

Eileen

0 SATHYA SHREE S 4 months ago in reply to Eileen Hernandez Hernandez

Intellectual 650 points

Hi,

Thanks for the reply. It means the step size increases by 1.953mV for each step?

Regards,

S Sathya shree

0 Eileen Hernandez Hernandez 4 months ago in reply to SATHYA SHREE S

TI__Expert 5328 points

Hi Sathya,

Yes that is correct. Each steps goes up/down by 1.953mV.

Regards,

Eileen

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TPSM846C23: VOUT_MODE