IR3500VMPBF International Rectifier, IR3500VMPBF Datasheet - Page 29

• Manufacturer Part Number: IR3500VMPBF
• Description: The IR3500V Control IC combined with one or more xPhase3 Phase IC implement the control and MOSFET driver functions for a VR11.1 CPU VTT power supply.
• Manufacturer: International Rectifier

Specifications of IR3500VMPBF

• Package: 32-Lead MLPQ
• Circuit: X-Phase Control IC
• Switch Freq (khz): 250kHz to 1.5MHz
• Pbf: PbF Option Available

C
A ceramic capacitor between 10pF and 220pF is usually enough.
Type III Compensation for Non-AVP Applications
Resistor R
the switching frequency per phase and select the desired phase margin θc. Calculate K factor from (31), and
determine the component values based on (32) to (36),
CP1
is optional and may be needed in some applications to reduce the jitter caused by the high frequency noise.
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DRP
and capacitor C
C
C
C
C
K
R
R
CP
CP
CP
CP
FB
FB
=
1
1
tan[
=
=
=
=
=
=
R
10
2
2
2
2
π
π
FB
π
π
π
4
∗
∗
∗
∗
∗
∗
∗
f
f
R
(
2 (
K
K
C
f
C
f
L
180
θ
C
DRP
C
CP
E
π
∗
∗
C
∗
1
∗
1
R
R
∗
∗
K
K
+
CP
FB
C
are not needed. Choose the crossover frequency fc between 1/10 and 1/5 of
1
∗
∗
E
L
5 .
R
C
E
V
)]
CP
∗
FB
I
C
∗
E
K
∗
f
C
)
2
∗
5
(30)
(31)
(32)
(33)
(34)
(35)
(36)
July 28, 2008
IR3500V