VIPER53EDIP-E View Datasheet(PDF) - STMicroelectronics
Part Name
Description
MFG CO.
'VIPER53EDIP-E' PDF : 31 Pages View PDF
VIPer53EDIP - E / VIPer53ESP - E
Regulation Loop Stability
The lowest load gives another condition for stability: The frequency FBW1 must not
encounter the third order slope generated by the load pole, the R1-C1 network on the
COMP pin and the R2-C2 network at the level of the TL431 on secondary side. This
condition can be met by adjusting both C1 and C2 values:
C1
>
-R----L----1-----⋅---C-----O-----U----T---
6.3 ⋅ -GR----O-4--- ⋅ R12
⋅
P-----O-----U-----T----1--
PMAX
C2 > -6---.--3-R---⋅--L---GR----1----O--4--⋅-----C--⋅---RO----1-U----⋅-T--R-----2- ⋅
P--P---O--M---U--A---T-X---1--
with:
POUT1 = V-----R--O2--L---U-1----T--
The above formula gives a minimum value for C1. It can be then increased to provide a
natural soft start function as this capacitor is charged by the current ICOMP at start-up.
DocRev1
17/31
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