IR3086AMTR International Rectifier, IR3086AMTR Datasheet - Page 19

• Manufacturer Part Number: IR3086AMTR
• Description: XPHASE Phase IC with OVP with fault overtemp detect. The IR3086AM Phase IC combined with an IR XPhase TM Control IC provides a full featured and flexible way to implement power solutions for the latest high performance CPUs and ASICs.
• Manufacturer: International Rectifier

Specifications of IR3086AMTR

• Package: 20-Lead MLPQ
• Circuit: X-Phase Phase IC
• Iout (a): 2.5A Gate Driver
• Pbf: PbF Option Available

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
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).
Page 19 of 33
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

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



FB
(





4
R
R









A
FB
FB
f
f
f
(
R
2 (
K
K
tan(
C
f
C
f
C
f
1
L
180

C
C
C

CP

E



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

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
are not needed. Choose
(28)
(29)
(30)
(31)
(32)
(33)
(34)
(35)
(36)
(37)
(38)
(39)
IR3086A
2/13/09
FB
and