What is the way to calculate VOUT in MPQ8632GLE-12?

DC-DC Power Converters
1

  1. I am designing a 12V input 5V output and 10A. Switching frequency 500kHz.
    The datasheet shows a typical application with R1= 84.5 and R2 = 10k, and with the MPS design tool the value of R1 with the same other values is different (R1 = 80.6k).
    Where can I see the calculations to get that values? I tried to get my own calculations and I get R1 around 70k with same R4=470k, R9=100 and C4=220pF values, estimating Vramp with the parameters the datasheet specifies. I don’t know what is the best way to calculate VOUT.

  2. In the datasheet typical application of 5V output and switching frequency 300kHz (Figure-49), R1 is the same as 3,3V Vout (Figure-47). I supose is a mistake, is that correct?

2

Hello,

Apologies for the delayed response.

  1. Please refer to page 29-30 of the datasheet for setting output voltage. There is flexibility when sizing components. The values in the typical application circuit were tested to provide the results in the graphs.
  2. Looks like Figure 47 (48.7k) and Figure 49 (82.5k) don’t have same R1 value.

Best Regards,
Yu