ST1S14 STMicroelectronics, ST1S14 Datasheet - Page 16

• Manufacturer Part Number: ST1S14
• Description: Up to 3 A step down switching regulator
• Manufacturer: STMicroelectronics

Closing the loop
6.2
16/42
Error amplifier compensation network
The ST1S14 embeds (see
network which is effective to stabilize the system in most of the application conditions
Figure 10. Transconductance embedded error amplifier
R
system stability but it is useful to reduce the noise at the output of the error amplifier.
The transfer function of the error amplifier and its compensation network is:
Equation 8
Where A
The poles of this transfer function are (if C
C
and C
A
vo
C
0
s ( )
= G
introduce a pole and a zero in the open loop gain. C
=
m
FB
V
---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- -
s
· R
+
2
⋅
o
R
0
? V
⋅
(
C
+
-
0
Figure
+
C
Doc ID 17977 Rev 1
G
p
) R
E/A
m
⋅
F
10) the error amplifier and a pre-defined compensation
?V
H
c
s ( )
⋅
C
A
c
=
V0
COMP
+
c
------------------------------------------ -
1
s
⋅
>> C
(
+
⋅
1
(
------------------ -
ω
R
+
n
R
0
s
0
s
⋅
0
1
⋅
+C
⋅
Q
C
R
P
c
c
P
+
+
⋅
):
C
------
ω
R
s
2
c
2
n
0
C
)
⋅
0
(
C
0
P
+
R
R
C
C
does not significantly affect
C
C
C
C
C
p
)
+
R
c
⋅
C
C
C
P
P
c
)
+
1
ST1S14