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ST1S41 Datasheet(PDF) 11 Page - STMicroelectronics

No. de pieza ST1S41
Descripción Electrónicos  850 kHz switching frequency
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Fabricante Electrónico  STMICROELECTRONICS [STMicroelectronics]
Página de inicio  http://www.st.com
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ST1S41 Datasheet(HTML) 11 Page - STMicroelectronics

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DocID023654 Rev 2
11/27
ST1S41
Functional description
The transfer function from FB to Vc (output of E/A) introduces the singularities (poles and
zeroes) to stabilize the loop. Figure 5 shows the small signal model of the error amplifier
with the internal compensation network.
Figure 5. Small signal model for the error amplifier
RC and CC introduce a pole and a zero in the open loop gain. CP does not significantly affect
system stability and can be neglected.
So GEA(s) results:
Equation 9
where GEA= Gm · Ro.
The poles of this transfer function are (if Cc >> C0+CP):
Equation 10
Equation 11
whereas the zero is defined as:
Equation 12
The embedded compensation network is RC=70 kΩ, CC=195 pF while CP and CO can be
considered as negligible. The error amplifier output resistance is 240 M
Ω so the relevant
singularities are:
Equation 13
Co
Ro
Cc
Rc
Cp
Gm*Vd
VFB
VREF
Vd
AM15062v1
G
EA s
()
G
EA0
1s
+
R
c
C
c
⋅⋅
()
s
2
R
0
C
0
C
p
+
() R
c
C
c
sR
0
C
c
R
0
C
0
C
p
+
() R
c
C
c
+
+
() 1
+
+
⋅⋅
---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
=
f
P LF
1
2
π R
0
C
c
⋅⋅
------------------------------------------
=
f
P HF
1
2
π R
c
C
0
C
p
+
()
⋅⋅
------------------------------------------------------------
=
f
Z
1
2
π R
c
C
c
⋅⋅
------------------------------------------
=
f
Z
11.6 kHz
f
PLF
3.4 Hz
=
=


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