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AN557 Datasheet(PDF) 18 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) 18 Page - STMicroelectronics

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AN557 APPLICATION NOTE
18/52
Figure 20. Frequency behaviour of the circuit of fig. 19
The system requires that DC gain is maximum to achieve good accuracy and line rejection. Beyond this
a bandwidth of some KHz is usually required for a good load transient response. The error amplifier trans-
fer function must guarantee the above constrainst. A compensation network that could be used is shown
in fig. 21.
Figure 21. Compensation network.
Figure 22. Bode plot of the regulation loop with the compensation network of fig. 21.
As
()
1sR1 C1
+
() 1sR2C2
+
()
sR1 C1 (1+s
C1
Gm
----------


----------------------------------------------------------------------
=
ACSJ
Gloop
PWM+FILTER
50Hz
500Hz
5Kz
50KHz
20
40
dB
D93IN012



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