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in the picture attached a shematic from a switching regulator, i take this from the manufacturer datasheet, the output is 3V3, what is the resistance that i should change to output 5V ?
The ratio of R1 to R2 sets the output voltage. For 5V out, you want R1/R2=3.0486. Any combination of resistances close to this will work fine, but you should keep the values in the range of 1K-100K.
To add to the discussion, you also need to ensure that the L1 choke that the datasheet recommends does not saturate for the new output voltage setting.
My calculations show that there is a small increase in inductor peak current with 5V output compared to the 3.3V output (for same output maximum load current). Also Vin_min will no longer be allowed to be 4.4 V, this being a buck topology.
To add to the discussion, you also need to ensure that the L1 choke that the datasheet recommends does not saturate for the new output voltage setting.
My calculations show that there is a small increase in inductor peak current with 5V output compared to the 3.3V output (for same output maximum load current). Also Vin_min will no longer be allowed to be 4.4 V, this being a buck topology.
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