VIPER53-E View Datasheet(PDF) - STMicroelectronics
Part Name
Description
MFG CO.
'VIPER53-E' PDF : 36 Pages View PDF
VIPer53 - E
Transconductance error amplifier
The lowest load gives another condition for stability: The frequency FBW1 must not encounter
the second order slope generated by the load pole and the integrator part of the error
amplifier. This condition can be met by adjusting the CCOMP value:
Equation 13
CC
O
MP
>
-----------R----L---1-----⋅------C----O-----U----T-----------
6.3 ⋅ Gm ⋅ RC2 OMP
⋅
-P----O----U----T----1-
PMAX
2
With:
POUT1
=
V-----O----U----T--
RL1
The above formula gives a minimum value for CCOMP. It can be then increased to provide a
natural soft start function as this capacitor is charged by the error amplifier current capacity
ICOMPhi at start-up.
Figure 22. Typical compensation network
VDD
OSC
15V
TOVL
DRAIN
COMP
SOURCE
Rcomp
10nF
Ccomp
27/36
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