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參數(shù)資料
| 型號： | IR3082 |
| 廠商： | International Rectifier |
| 英文描述： | XPHASE AMD OPTERON/ATHLON 64 CONTROL IC |
| 中文描述： | XPHASE AMD皓龍/速龍64控制IC |
| 文件頁數(shù)： | 24/33頁 |
| 文件大?。?/td> | 444K |
| 代理商： | IR3082 |
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IR3082
Page 24 of 24
12/17/04
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
CP and
C
CP
can be determined by equations (27) and (28).
V
R
C
L
f
R
+
)
2
1
π
o
CE
E
C
PWMRMP
V
FB
R
E
E
f
C
CP
C
=
2
2
)
2
π
(27)
CP
E
E
CP
R
C
L
C
=
10
(28)
where L
E
and R
CE
are the equivalent output inductance and ESR of output capacitors respectively. C
CP1
is optional
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
CP and
C
CP
can be determined by equations (29) and (30), where C
E
is equivalent output capacitance.
V
C
L
f
R
=
o
PWMRMP
E
E
V
C
CP
2
)
2
π
(29)
CP
E
E
CP
R
C
L
C
=
10
(30)
Choose resistor R
FB1
according to Equation (31), and determine C
FB
from Equations (32).
1
1
=
to
FB
R
FB
FB
R
R
2
FB
R
3
2
1
=
(31)
1
1
4
1
FB
C
FB
R
f
C
=
π
(32)
C
CP1
is optional 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.
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
CI
) based on the crossover
frequency of voltage loop (f
C
), and determine the C
SCOMP
,
6
_
10
05
.
2
)]
(
2
1
65
.
+
=
CI
O
MI
O
O
E
CI
LE
ROOM
π
CS
V
O
I
PWMRMP
R
SCOMP
f
F
I
V
C
f
R
G
I
V
C
π
(33)
Where FMI is the PWM gain in the current share loop,
)
(
)
(
DAC
V
I
DAC
V
PWMRMP
V
O
PWMRMP
V
SW
PWMRMP
PWMRMP
V
SCOMP
V
f
C
R
C
=
(34)
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