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AN557 Datasheet(PDF) 15 Page - STMicroelectronics

Part # AN557
Description  EASY APPLICATION DESIGN WITH THE L4970A
PDF  52 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN557 Datasheet(HTML) 15 Page - STMicroelectronics

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AN557 APPLICATION NOTE
Figure 12. Error Amplifier Circuit.
Figure 13. Open loop gain (error amplifier only)
Figure 14. Error amplifier equivalent circuit.
In which:
15)
where Co = 3pF
The error amplifier can be easily compensated thanks to the high output impedance (see fig. 14) The re-
sulting transfer function is as in the following:
(16)
Av s
()
Gm
R
c
1sR
o Co
+
----------------------------
⋅
=
Av s
()
Gm
R
o
1sR
c Cc
+
()
⋅
s
2
R
o Co Rc Cc
sR
o Cc
R
o Co
R
c Cc
++
() 1
++
---------------------------------------------------------------------------------------------------------------------
⋅
=



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