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AN487 Datasheet(PDF) 7 Page - STMicroelectronics

Part # AN487
Description  INTRODUCTION TO A 10A MONOLITHIC SWITCHING
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN487 Datasheet(HTML) 7 Page - STMicroelectronics

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AN487 APPLICATION NOTE
Neglecting the high frequency behavior (in the hy-potesis that in the overall frequency compensation of
the loop the second pole of the operational amplifier is far below the 0 dB axis), we can make a first order
approx. by which the error amplifier can be schematized by the equivalent circuit of fig.12.
Figure 12. Error amplifier equivalent circuit.
by which
where Co = 3pF.
The error amplifier is inserted in the regulation loop and can be easily compensated, thanks to its high
output impedance, with a network between its output and ground. The typical compensated network is
shown in fig.13.
Figure 13. Compensation network of the error amplifier.
The transfer function is:
In the hypotesis that Rc<Ro and Cc>Co, the Bode diagram of the compensated amplifier is reported (see fig.14).
Figure 14. Bode plot showing gain and phase of compensated error amplifier.
A
V s
()
G
M
R
o
1SR
o Co
+
-----------------------------
=
A
V s
()
G
v
R
o 1S Rc Co
+
()
S
2
R
o Co Rc Cc
SR
o Cc
R
o Co
R
c Cc
++
() 1
++
-----------------------------------------------------------------------------------------------------------------------
=


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