EVALA5973AD STMicroelectronics, EVALA5973AD Datasheet - Page 11

Power Management Modules & Development Tools EVAL BOARD A5973AD Auto Grade

EVALA5973AD

Manufacturer Part Number
EVALA5973AD
Description
Power Management Modules & Development Tools EVAL BOARD A5973AD Auto Grade
Manufacturer
STMicroelectronics
Type
DC/DC Switching Converters, Regulators & Controllersr
Datasheet

Specifications of EVALA5973AD

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
2.5 A
Dimensions
23 mm x 20 mm
For Use With/related Products
AN1518
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
AN1518
5
6
Closing the loop
Figure 9.
Error amplifier and compensation network
The output L-C filter of a step-down converter contributes with 180 degrees phase shift in
the control loop. For this reason a compensation network between the COMP pin and
GROUND is added. The simplest compensation network together with the equivalent circuit
of the error amplifier are shown in
open loop gain. CP does not significantly affect system stability but it is useful to reduce the
noise of the COMP pin.
The transfer function of the error amplifier and its compensation network is:
Equation 2
Where A
A
vo
0
s ( )
= G
Block diagram of the loop
=
m
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- -
s
2
· R
R
o
0
(
C
0
+
C
p
) R
Figure
c
A
C
V0
10. R
c
+
s
(
1
C
(
+
R
and C
s
0
R
C
c
c
C
+
introduce a pole and a zero in the
C
R
c
0
)
(
C
0
+
C
p
)
+
R
Closing the loop
c
C
c
)
+
1
11/30

Related parts for EVALA5973AD