EVALA5973D STMicroelectronics, EVALA5973D Datasheet - Page 12

• Manufacturer Part Number: EVALA5973D
• Description: Power Management Modules & Development Tools EVAL BOARD A5973D Auto Grade
• Manufacturer: STMicroelectronics
• Type: DC/DC Switching Converters, Regulators & Controllersr

Specifications of EVALA5973D

• 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

LC filter
7
12/30
Figure 10. Error amplifier equivalent circuit and compensation network
The poles of this transfer function are (if C
Equation 3
Equation 4
whereas 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
P1
is the low frequency which sets the bandwidth, while the zero F
A
LC
s ( )
=
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- -
s
2
•
L C
•
OUT
•
(
ESR
F
P2
F
F
R
P1
=
+
Z1
LOAD
R
---------------------------------------------------------
2 π
=
=
LOAD
•
c
-------------------------------------- -
2
-------------------------------------- -
2
•
>> C
•
•
•
(
)
π
R
π
1
+
•
c
•
+
s
1
1
1
•
0
R
R
ESR C
•
+C
(
0
c
C
(
•
•
ESR
P
0
C
C
):
•
+
c
c
C
•
p
OUT
)
C
OUT
•
P2
s
)
•
is usually at a very high
R
LOAD
Z1
is usually put near to
+
L
)
+
R
LOAD
AN1518