TPS55340: Power management forum

Hen Lange

Part Number: TPS55340

hi,

bellow please find my connection to the FB pin, the BOOST_FB is connected to a DAC on my microcontroller.

is there a way to control the output voltage of the boost by using this DAC or other SW controlled part? that is, without changing the connected resistors?

Thanks for your help

Hen

over 6 years ago

0 Zack Liu over 6 years ago

TI__Mastermind 34231 points

Hi Hen,

R80 is needed as the lower feedback resistor to GND. What's the DAC output voltage raneg? And how high and low do you want for the V_MOTOR?

0 Hen Lange over 6 years ago in reply to Zack Liu

Prodigy 220 points

DAC range is 0-3.3V

V_MOTOR - 6.5V- 28

R80 is o.k at 0 ohm? or should I connect a different value resistor?

thank you

Hen

0 Zack Liu over 6 years ago in reply to Hen Lange

TI__Mastermind 34231 points

Hi Hen,

Please see below picture,. The lower side resistor is necessary.

When DAC output is 3V, V_MOTOR is 6.5V. When DAC output is 0V, V_MOTOR is 28V.