a5975d STMicroelectronics, a5975d Datasheet - Page 20

• Manufacturer Part Number: a5975d
• Description: Up To 3 A Step-down Switching Regulator For Automotive Applications
• Manufacturer: STMicroelectronics

Closing the loop
20/50
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 LC filter (see below). F
frequency.
P1
is the low frequency which sets the bandwidth, while the zero F
Doc ID 018760 Rev 1
F
P2
F
=
F
Z1
P1
--------------------------------------------------- -
2 π R
=
⋅ ⋅
=
---------------------------------
2 π R
c
--------------------------------- -
2 π R
⋅
>> C
⋅
c
⋅
⋅
1
1
⋅
(
1
0
C
c
+C
0
⋅
0
C
⋅
+
P
C
c
C
):
c
p
)
P2
is usually at a very high
Z1
is usually put near to
A5975D