There are two ways to set the output voltage of the TLV61046A. When the FB pin is connected to the input voltage, the output voltage is fixed to 12 V. This function makes the TLV61046A only need three external components to minimize the solution size. The second way is to use an external resistor divider to set the desired output voltage.

By selecting the external resistor divider R1 and R2, as shown in Equation 1, the output voltage is programmed to the desired value. When the output voltage is regulated, the typical voltage at the FB pin is V_REF of 795 mV.

Equation 1.

where

• V_OUT is the desired output voltage
• V_REF is the internal reference voltage at the FB pin

For best accuracy, R2 should be kept smaller than 80 kΩ to ensure the current flowing through R2 is at least 100 times larger than the FB pin leakage current. Changing R2 towards a lower value increases the immunity against noise injection. Changing the R2 towards a higher value reduces the quiescent current for achieving higher efficiency at low load currents.