IR3500AMPBF International Rectifier, IR3500AMPBF Datasheet - Page 42

• Manufacturer Part Number: IR3500AMPBF
• Description: IC CTRL XPHASE3 VR11.0 32-MLPQ
• Manufacturer: International Rectifier
• Series: XPhase3™r

Specifications of IR3500AMPBF

• Applications: Processor
• Current - Supply: 6.5mA
• Voltage - Supply: 4.75 V ~ 7.5 V
• Operating Temperature: 0°C ~ 100°C
• Mounting Type: Surface Mount
• Package / Case: *
• Package: 32-Lead MLPQ
• Circuit: X-Phase Control IC
• Switch Freq (khz): 250kHz to 1.5MHz
• Pbf: PbF Option Available
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

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 42 of 48
−
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
July 28, 2009
=
13
=3.65k .
9 .
IR3500A
k
Ω