IR3082AMTRPBF International Rectifier, IR3082AMTRPBF Datasheet - Page 24

• Manufacturer Part Number: IR3082AMTRPBF
• Description: IC XPHASE CONTROL 9.6V 20-MLPQ
• Manufacturer: International Rectifier
• Series: XPhase™r

Specifications of IR3082AMTRPBF

• Applications: Processor
• Current - Supply: 12mA
• Voltage - Supply: 8.05 V ~ 16 V
• Operating Temperature: 0°C ~ 100°C
• Mounting Type: Surface Mount
• Package / Case: 20-MLPQ
• Ic Function: Control IC
• Supply Voltage Range: 8.05V To 16V
• Operating Temperature Range: 0°C To +100°C
• Digital Ic Case Style: MLPQ
• No. Of Pins: 20
• Filter Terminals: SMD
• Supply Voltage Min: 9.6V
• Rohs Compliant: Yes
• Controller Type: PWM
• Frequency: 1MHz
• Package: 20-Lead MLPQ
• Circuit: X-Phase Control IC
• Switch Freq (khz): 150kHz to 1.0MHz
• Pbf: PbF Option Available
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: IR3082AMTRPBFTR

Type II Compensation
Determine the compensation at no load, the worst case condition. Choose the crossover frequency fc between 1/10
and 1/5 of the switching frequency per phase. Assume the time constant of the resistor and capacitor across the
output inductors matches that of the inductor, R
where L
and may be needed in some applications to reduce the jitter caused by the high frequency noise. A ceramic
capacitor between 10pF and 220pF is usually enough.
Type III Compensation
Determine the compensation at no load, the worst case condition. Choose the crossover frequency fc between 1/10
and 1/5 of the switching frequency per phase. Assume the time constant of the resistor and capacitor across the
output inductors matches that of the inductor, R
is equivalent output capacitance.
Choose resistor R
C
ceramic capacitor between 10pF and 220pF is usually enough.
CURRENT SHARE LOOP COMPENSATION
The crossover frequency of the current share loop should be at least one decade lower than that of the voltage loop
in order to eliminate the interaction between the two loops. A capacitor from SCOMP to LGND is usually enough for
most of the applications. Choose the crossover frequency of current share loop (f
frequency of voltage loop (f
Where FMI is the PWM gain in the current share loop,
CP1
is optional and may be needed in some applications to reduce the jitter caused by the high frequency noise. A
E
Page 24 of 33
and R
CE
C
C
C
C
C
R
R
R
CP
FB1
CP
CP
CP
FB
SCOMP
SCOMP
FB
are the equivalent output inductance and ESR of output capacitors respectively. C
1
according to Equation (31), and determine C
2 (
10
10
2 ( S
4
1
2
S
S
˜
˜
R
. 0
(
˜
1
R
V
˜
˜
FB
R
R
f
65
C
O

PWMRMP
f
L
L
f
C
CP
1
C
CP
C
), and determine the C
1
E
E

2 (
)
˜
)
˜
V
2
˜
˜
R
S
2
R
C
C
PWMRMP
˜
PWMRMP
˜
FB
L
˜
E
E
L
˜
E
1
f
V
to
E
C
C
˜
o
˜
PWMRMP
C
˜
C
C
E

˜
E
E
V
˜
V
˜
I
R
˜
V
DAC
R
R
˜
FB
PWMRMP
I
˜
CE
FB
O
f
˜
)
1
SW
V
)
˜
˜
G
2
(
PWMRMP
V
V
CS
˜
˜
CP and
V
V
CP and
O
I
2
3
PWMRMP

o
_
˜
R
ROOM
2
V
FB
SCOMP
S
DAC
˜
C
f
C
˜
)
CI
R
CP
CP
LE
˜
. 1
,
can be determined by equations (27) and (28).
can be determined by equations (29) and (30), where C
˜
05
1 [

˜
10
2
S
6
˜
FB
f
CI
from Equations (32).
˜
C
E
˜
(
V
O
I
O
)]
˜
F
MI
CI
(29)
(30)
) based on the crossover
(34)
(27)
(28)
(31)
(32)
(33)
05/02/2006
IR3082A
CP1
is optional
E