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DFS04M Fiches technique(PDF) 21 Page - STMicroelectronics

No de pièce DFS04M
Description  APPLICATION NOTE
PDF  42 Pages
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Fabricant  STMICROELECTRONICS [STMicroelectronics]
Site Internet  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

DFS04M Fiches technique(HTML) 21 Page - STMicroelectronics

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AN1262 APPLICATION NOTE
Figure 8. Brownout protection circuit and timing diagram
15
CONTROL LOOP DESIGN
The control loop can be summarized as shown in figure 9, where each block is described by its transfer function
in the complex frequency domain represented by means of a Bode plot.
Figure 9. Control loop Block Diagram
The set PWM modulator + Power stage is what, in control theory terminology, is called the "plant", while the
compensated error amplifier is the "controller".
+
-
L6590A
L6590D
2.5 V
VinOK
50 µA
Vin
6.4 V
R1
R2
Vcc
Vin
VPKmin
Vinmin
VinOFF
VinON
VinOK
Vcc
PWM
Vout
OUTPUT
DIVIDER
+
-
Vref
Vo
COMPENSATED
ERROR AMPLIFIER
VCOMP
PWM MODULATOR
POWER STAGE
G2(j
ω)
Vin
D
G1(j
ω)



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