IR3080 International Rectifier, IR3080 Datasheet - Page 26

• Manufacturer Part Number: IR3080
• Description: XPHASE VRD10 CONTROL IC WITH VCCVID & OVERTEMP DETECT
• Manufacturer: International Rectifier

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 (39), and determine the component values based on Equations (40) to
(44),
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 ground is usually enough
for the share loop compensation. Choose the crossover frequency of current share loop (f
crossover frequency of voltage loop (f
Where F
CP1
Page 26 of 41
is optional and may be needed in some applications to reduce the jitter caused by the high frequency noise. A
C
MI
SCOMP
FB
is the PWM gain in the current share loop
is chosen according to Equations (16), and resistor R
=
. 0
65
C
C
C
C
R
K
R
R
F
CP
CP
MI
CP
CP
CP
FB
FB
*
=
1
1
R
=
=
tan[
=
=
=
=
=
=
PWMRMP
2 (
R
R
2
2
10
2
(
2
π
π
FB
PWMRMP
V
π
π
π
π
4
I
∗
∗
∗
∗
∗
∗
∗
∗
−
f
f
(
R
2 (
K
K
V
C
f
C
f
f
L
180
θ
C
*
C
C
CP
PWMRMP
E
π
∗
∗
V
C
)
∗
1
∗
2
1
*
R
R
I
∗
∗
K
∗
K
*
+
CP
C
FB
C
L
1
∗
I
PWMRMP
∗
C),
E
L
O
E
5 .
R
C
E
*
∗
)]
CP
−
and determine the C
∗
FB
G
C
V
V
V
C
O
CS
E
DAC
V
O
E
O
∗
∗
*
_
∗
∗
R
ROOM
2
)
f
FB
π
f
SW
( *
K
C
∗
)
V
∗
2
*
I
V
f
V
*
∗
CI
−
PWMRMP
V
PWMRMP
R
,
V
*
PWMRMP
LE
DAC
. 1
*
05
1 [
)
*
+
10
SCOMP
2
π
6
*
f
CI
DRP
,
*
C
and capacitor C
E
( *
V
O
I
O
)]
*
F
MI
DRP
are not needed. Choose
(37)
(38)
(39)
(40)
(41)
(42)
(43)
(44)
(
(45)
46)
CI
9
) based on the
/30/04
IR3080