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參數(shù)資料
| 型號： | IR3009 |
| 廠商： | International Rectifier |
| 英文描述： | 3 PHASE OPTERON, ATHLON, OR VR10.X CONTROL IC |
| 中文描述： | 3相皓龍，速龍，或控制IC的VR10.X |
| 文件頁數(shù)： | 27/39頁 |
| 文件大?。?/td> | 693K |
| 代理商： | IR3009 |
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IR3093
Page 27 of 39
07/15/04
M
IN
FB
E
E
F
C
COMP
V
R
C
L
f
R
2
1
)
2
S
(17)
COMP
E
E
COMP
R
C
L
C
10
(18)
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 (17), V
IN
is the input voltage, F
M
is
the PWM comparator gain (refer to equation (25)).
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 (19).
R
f
*
*
2
S
Choose the desired crossover frequency fc1 around fc estimated by Equation (19). 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 (20), and determine C
FB
and C
DRP
from Equations (21) and (22).
1
1
to
LE
FB
CS
E
DRP
C
R
R
G
C
(19)
FB
FB
R
R
2
FB
FB
R
R
3
2
1
(20)
1
1
4
1
FB
C
FB
R
f
C
S
(21)
DRP
FB
FB
FB
DRP
R
C
R
R
C
)
(
1
(22)
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 (23) and (24), where F
M
is
the PWM comparator gain defined by Equation (25).
L
f
R
M
I
FB
E
E
C
COMP
F
V
R
C
2
1
)
2
S
(23)
COMP
E
E
COMP
R
C
L
C
10
(24)
RAMP
I
O
M
V
V
V
*
F
(25)
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.
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