IR3081AMTRPBF International Rectifier, IR3081AMTRPBF Datasheet - Page 24

• Manufacturer Part Number: IR3081AMTRPBF
• Description: IC CTRLR XPHASE VR10.0 28MLPQ
• Manufacturer: International Rectifier
• Series: XPhase™r

Specifications of IR3081AMTRPBF

• Applications: Processor
• Current - Supply: 11mA
• Voltage - Supply: 9.5 V ~ 14 V
• Operating Temperature: 0°C ~ 100°C
• Mounting Type: Surface Mount
• Package / Case: 28-MLPQ
• Ic Function: Control IC
• Supply Voltage Range: 9.5V To 14V
• Operating Temperature Range: 0°C To +100°C
• Digital Ic Case Style: MLPQ
• No. Of Pins: 28
• Filter Terminals: SMD
• Supply Voltage Min: 9.5V
• Rohs Compliant: Yes
• Controller Type: PWM
• Package: 28-Lead MLPQ
• Circuit: X-Phase Controller IC
• Switch Freq (khz): 150kHz to 1.0MHz
• Pbf: PbF Option Available
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: IR3081AMPBFTR; IR3081AMTRPBFTR; IR3081AMTRPBFTR

Choose the desired crossover frequency fc around fc1 estimated by Equation (27) or choose fc between 1/10 and
1/5 of the switching frequency per phase, and select the components to ensure the slope of close loop gain is -20dB
/Dec around the crossover frequency. Choose resistor R
R
R
and transient load response. Determine R
C
ceramic capacitor between 10pF and 220pF is usually enough.
Type III Compensation for Non-AVP Applications
Resistor R
the crossover frequency fc between 1/10 and 1/5 of the switching frequency per phase and select the desired phase
margin θc. Calculate K factor from Equation (34), and determine the component values based on Equations (35) to
(39),
DRP
CP
CP1
Page 24 of 39
and C
is optional and may be needed in some applications to reduce the jitter caused by the high frequency noise. A
from Equations (30) and (31).
FB
CP
is chosen according to Equations (13), and resistor R
have limited effect on the crossover frequency, and are used only to fine tune the crossover frequency
θ
C
C
C
C
C
C
R
R
K
R
R
C
CP
CP
CP
CP
FB
FB
DRP
CP
FB
FB
1
=
1
1
1
=
=
=
tan[
=
=
=
=
=
=
=
90
=
2 (
R
4
2
2
10
2
1
2
2
π
π
π
FB
(
π
π
π
π
−
4
R
R
∗
∗
∗
∗
∗
∗
∗
∗
∗
A
FB
FB
f
f
f
(
R
2 (
K
K
tan(
C
C
f
C
f
f
1
L
180
θ
C
C
C
+
CP
∗
E
π
∗
∗
C
)
∗
1
R
∗
R
2
1
R
R
R
∗
∗
. 0
K
DRP
∗
K
FB
+
CP
FB
FB
C
) 5
L
1
∗
to
∗
1
1
E
L
E
5 .
)
∗
R
C
E
∗
∗
)]
CP
180
∗
FB
π
C
C
V
CP
C
O
FB
E
V
E
O
R
∗
and C
∗
FB
∗
R
FB
f
K
1
C
=
)
∗
2
CP
V
2
3
∗
PWMRMP
V
R
PWMRMP
from Equations (32) and (33).
FB
FB1
according to Equation (29), and determine C
DRP
and capacitor C
DRP
IR3081APBF
are not needed. Choose
(28)
(29)
(30)
(31)
(32)
(33)
(34)
(35)
(36)
(37)
(38)
(39)
1/31
/05
FB
and