ir3500 International Rectifier Corp., ir3500 Datasheet - Page 41
ir3500
Manufacturer Part Number
ir3500
Description
Xphase3 Vr11.0 & Amd Pvid Control Ic
Manufacturer
International Rectifier Corp.
Datasheet
1.IR3500.pdf
(47 pages)
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VOLTAGE LOOP COMPENSATION
Type III compensation is used for the converter with only ceramic output capacitors. The crossover frequency and
phase margin of the voltage loop can be estimated as follows.
Choose R
Choose
Choose the desired crossover frequency fc (=150kHz) around fc1 estimated above, and calculate
Choose R
Choose C
θ
C
C
C
R
R
R
f
C
C
DRP
CP
DRP
FB
CP
HOTSET
1
1
=
=
=
=
=
=
=
90
10
2
4
2 (
(
1
R
π
π
R
Page 41 of 47
−
π
=
R
∗
FB
FB
∗
∗
FB
A
FB
CP1
FB
∗
C
(
R
f
∗
+
tan(
L
R
1
C
f
1
=13.7k .
CP
E
C
R
= 1.65k , and calculate R
R
R
E
TMAX
=
=47pF to reduce high frequency noise.
∗
n
DRP
)
L
FB
∗
∗
2
R
. 0
∗
_
2
3
G
C
1
∗
FB
R
MAX
R
) 5
)
∗
CS
L
E
∗
O
+
DRP
1
V
R
E
∗
C
I
=
FB
=
R
∗
∗
180
FB
*
π
10
HOTSET
C
G
R
4
=
π
=
E
CS
FB
∗
=
2
3
∗
∗
. 1 (
1
∗
150
R
=
63
∗
6 .
(
2
65
. 1
100
FB
R
)
. 1
°
65
( *
LE
*
*
65
∗
10
10
*
VCCL
5
*
1
*
10
=
3
10
3
=
10
6
+
13
∗
2
. 6
−
3
. 1
*
2 (
. 1
9
π
3
65
7 .
=
. 0
*
* 1
/
* 1
π
∗
) 6
−
. 1
∗
. 0
91
*
DRP
(
10
∗
10
10
10
. 1
62
10
64
∗
150
*
3
) 6
(
3
3
10
3
)
k
22
*
∗
.
∗
Ω
=
10
*
22
−
=
4
*
3
10
4
7 .
−
10
8 .
(
*
3
142
*
3
10
*
nF
)
10
−
2
6
34
∗
−
−
*
+
, choose C
9
6
(
62
100
=
)
=
931
∗
)
. 6
. 6
2
34
1
0 .
58
*
=
65
6 .
* )
10
nF
3
∗
k
*
5 .
. 1
Ω
7 (
−
10
9
nF
65
, choose R
/
−
FB
3
12
) 6
*
. 1
, choose C
10
=4.7nF.
∗
) 6
, choose C
(
3
22
=
∗
*
0 (
. 3
10
5 .
63
DRP
−
*
6
k
CP
10
∗
Ω
=6.65k .
DRP
62
=3.3nF.
, choose R
−
3
)
=2.2nF.
∗
/
. 1
) 6
65
=
*
165
10
HOTSET1
3
kHz
*
5
June 12, 2007
=
13
=3.65k .
9 .
k
Ω
IR3500