EVALA5972D STMicroelectronics, EVALA5972D Datasheet - Page 12

• 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
4.2
12/29
Figure 10. Error amplifier equivalent circuit and compensation network
The poles of this transfer function are (if C
Equation 3
Equation 4
where the zero is defined as:
Equation 5
F
the frequency of the double pole of the L-C filter (see below). F
frequency.
LC filter
The transfer function of the L-C filter is given by:
Equation 6
where R
If R
P1
LOAD
is the low frequency which sets the bandwidth, while the zero F
A
LOAD
>>ESR, the previous expression of A
LC
s ( )
is defined as the ratio between V
=
----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
s
2
•
L C
•
OUT
•
(
ESR
F
P2
F
F
R
+
P1
=
Z1
LOAD
R
------------------------------------------------------- -
2 π
LOAD
=
=
•
c
-------------------------------------
2 π
------------------------------------ -
2 π
•
>> C
•
•
•
(
)
LC
R
1
+
OUT
c
•
•
+
s
1
1
1
•
can be simplified and becomes:
0
R
R
ESR C
•
+C
(
0
c
C
(
and I
•
•
ESR C
0
P
C
C
+
):
•
c
c
C
OUT
•
p
OUT
)
OUT
.
•
s
P2
)
•
R
is usually at a very high
LOAD
Z1
is usually put near to
+
L
)
+
R
LOAD
AN1517