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Topic: Setting the voltage converter ST1S40 output voltage +5V (Read 307 times) previous topic - next topic



I found linear DC/DC voltage converter for power (IN +12V / OUT +5V) - ST1S40. This conventer needed me for power my board created with basic chip of ATMEGA328.

Basic features:
- Input Voltage: 4V-18V
- Output Voltage: 0.8V-18V
- Max output current: 3A
- High efficiency


I think that output voltage regulation with resistors. I do not understand how to calculate the value of resistor for output voltage +5V  :(

In Datasheet:

Has anyone worked with this converter?


Dec 05, 2018, 02:35 pm Last Edit: Dec 05, 2018, 03:52 pm by WattsThat Reason: Corrected first sentence
You match the output of the voltage divider to the vref voltage (5v -> 0.8v).

20 / (105 + 20) * 5 = 0.8

R1 = 105K and R2 = 20K for 5 volt output.
Vacuum tube guy in a solid state world


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