參數(shù)資料
型號: IR3080
廠商: International Rectifier
英文描述: XPHASE VRD10 CONTROL IC WITH VCCVID & OVERTEMP DETECT
中文描述: XPHASE VRD10控制集成電路VCCVID
文件頁數(shù): 26/41頁
文件大?。?/td> 2267K
代理商: IR3080
IR3080
O
PWMRMP
V
FB
E
E
C
CP
V
R
C
L
f
R
=
2
)
2
π
(37)
CP
E
E
CP
R
C
L
C
=
10
(38)
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 for Non-AVP Applications
Resistor R
FB
is chosen according to Equations (16), and resistor R
DRP
and capacitor C
DRP
are not needed. Choose
the crossover frequency fc between 1/10 and 1/5 of the switching frequency per phase and select the desired phase
margin
θ
c. Calculate K factor from Equation (39), and determine the component values based on Equations (40) to
(44),
θ
π
)]
5
+
180
(
4
tan[
=
C
K
(39)
K
V
V
f
C
L
R
R
O
PWMRMP
C
E
E
FB
CP
=
2
)
2
π
(40)
CP
C
CP
R
f
K
C
=
π
2
(41)
CP
C
CP
R
K
f
C
=
π
2
1
1
(42)
FB
C
FB
R
f
K
C
=
π
2
(43)
FB
C
FB
C
K
f
R
=
π
2
1
1
(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
CI
) based on the
crossover frequency of voltage loop (f
C),
and determine the C
SCOMP
,
1
*
*
*
*
*
65
.
LE
ROOM
CS
O
I
PWMRMP
SCOMP
f
V
π
6
_
10
*
05
.
*
2
*
)]
(
*
*
*
2
CI
O
MI
O
O
E
CI
F
I
V
C
f
R
G
I
V
R
C
+
=
π
(45)
Where F
MI
is the PWM gain in the current share loop
,
R
F
=
)
(
*
)
(
*
*
*
DAC
V
I
DAC
V
PWMRMP
V
I
PWMRMP
SW
PWMRMP
PWMRMP
V
MI
V
V
f
C
(
46)
Page 26 of 41
9
/30/04
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