Tool/software:
Hi Team,
Base on formula RFB_PG(TOP) = RFB_PG(Bottom) x (VOUT (nom)/0.2V x K - 1)
Vin:5V; Vout:3.3V
The required output voltage is VOUT (nom)=3.3V (set according to Table 8-1)
RFB_PG(Bottom)=12.4K (set according to Table 8-1)
K=95% (set according to Table 8-1)
RFB_PG(TOP) = 12.4*(3.3/0.2*0.95 - 1) =181.97 Kohm
Because I cannot get 187K according to Table 8-1, I use 187K Ohm to get VOUT (nom)
187= 12.4*(VOUT (nom)/0.2*0.95 - 1)
= > VOUT (nom) = 3.385 V
3.385V is not the output voltage I want, 3.3V
So, I changed the setting of K = 90%, and the setting reaches 90% of 3.3V to trigger PG
RFB_PG(TOP) = 12.4*(3.3/0.2*0.90 - 1) =171.74 Kohm
So, my circuit will choose 169 Kohm
