EVALA5972D STMicroelectronics, EVALA5972D Datasheet - Page 14

• Manufacturer Part Number: EVALA5972D
• Description: Power Management Modules & Development Tools EVAL BOARD A5972 Auto Grade
• Manufacturer: STMicroelectronics
• Type: DC/DC Switching Converters, Regulators & Controllersr

Specifications of EVALA5972D

• Input Voltage: 4.4 V to 36 V
• Output Voltage: 1.235 V to 35 V
• Board Size: 23 mm x 20 mm
• Product: Power Management Modules
• Supply Current: 2 A
• Dimensions: 23 mm x 20 mm
• For Use With/related Products: AN1517
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Closing the loop
14/29
This means that even if the input voltage changes, the error amplifier does not change its
value to keep the loop in regulation, thus ensuring a better line regulation and line transient
response.
To sum up, the open loop gain can be written as:
Equation 15
Example:
●
●
Finally R
The gain and phase bode diagrams are plotted respectively in
Figure 11. Module plot
Considering R
–
–
–
If L = 22 µH, C
–
–
1
F
F
F
F
F
= 5.6 kΩ and R
P1
P2
Z1
PLC
0
= 19.89 kHz
= 2.68 kHz
= 9 Hz
= 256 kHz
= 3.39 kHz
C
OUT
= 2.7 kΩ, C
= 100 µF and ESR = 80 mΩ, the poles and zeroes of A
G s ( )
2
= 3.3 kΩ.
=
C
G
= 22 nF and C
PWM
s ( )
•
------------------- -
R
1
R
+
2
R
P
2
= 220 pF, the poles and zeroes of A
•
A
O
s ( )
•
A
LC
Figure 11
s ( )
and
Figure
LC
become:
AN1517
12.
0
are: