參數(shù)資料
型號(hào)： IR3092
廠商： International Rectifier
英文描述： 2 PHASE OPTERON, ATHLON, OR VR10.X CONTROL IC
中文描述： 2相皓龍，速龍，或控制IC的VR10.X
文件頁(yè)數(shù)： 25/37頁(yè)
文件大小： 619K
代理商： IR3092
IR3092
Page 25 of 37
06/25/04
R
COMP
and C
COMP
have limited effect on the crossover frequency, and are used only to fine tune the crossover frequency
and transient load response. Choose the desired crossover frequency fc1 around fc estimated by Equation (13) and
determine R
COMP and
C
COMP.
C
L
f
R
M
IN
C
FB
E
E
F
C
COMP
V
R
2
1
)
2
S
(14)
COMP
E
E
COMP
R
L
C
10
(15)
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.
In equation (14), V
IN
is the input voltage, F
M
is the PWM
comparator gain (refer to equation (22)).
Type III Compensation
Determine the compensation at no load, the worst case condition. Assume the time constant of the resistor and capacitor
across the output inductors matches that of the inductor, the crossover frequency of the voltage loop can be estimated by
Equations (16).
R
f
*
*
2
S
Choose the desired crossover frequency fc1 around fc estimated by Equation (16). Select other components to ensure the
slope of close loop gain is -20dB/Dec around the crossover frequency. Choose resistor R
FB1
according to Equation (17),
and determine C
FB
and C
DRP
from Equations (18) and (19).
1
1
to
FB
FB
R
R
3
1
FB
R
f
S
C
R
R
C
LE
FB
CS
E
DRP
C
R
R
G
C
(16)
FB
FB
R
R
2
2
1
(17)
1
1
4
FB
C
C
(18)
DRP
FB
FB
FB
DRP
R
)
(
1
(19)
R
COMP
and C
COMP
have limited effect on the crossover frequency, and are used only to fine tune the crossover frequency
and transient load response. Determine R
COMP
and C
COMP
from Equations (20) and (21), where F
M
is the PWM
comparator gain defined by Equation (22).
L
f
R
M
I
FB
E
E
C
COMP
F
V
R
C
2
1
)
2
S
(20)
COMP
E
E
COMP
R
C
L
C
10
(21)
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