參數(shù)資料
型號(hào)： 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(yè)數(shù)： 20/33頁(yè)
文件大小： 444K
代理商： IR3082
IR3082
Page 20 of 20
12/17/04
6
6
/
/
/
/
10
66
)
10
66
3
)
3
=
I
=
DEL
SS
DEL
SS
CHG
CHG
DEL
SS
DEL
SS
SSDEL
R
C
I
R
C
t
(6)
VDAC Slew Rate Programming Capacitor
C
VDAC
and Resistor
R
VDAC
The slew rate of VDAC down-slope SR
DOWN
can be programmed by the external capacitor C
VDAC
as defined in
Equation (7), where I
SINK
is the sink current of VDAC pin as shown in Figure 15. The resistor R
VDAC
is used to
compensate VDAC circuit and is determined by Equation (8). The slew rate of VDAC up-slope SR
UP
is proportional
to that of VDAC down-slope and is given by Equation (9), where I
SOURCE
is the source current of VDAC pin as
shown in Figure15.
I
C
=
DOWN
SINK
VDAC
SR
(7)
2
15
10
2
C
5
VDAC
VDAC
R
+
=
(8)
VDAC
C
SOURCE
UP
I
SR
=
(9)
Over Current Setting Resistor
R
OCSET
The inductor DC resistance is utilized to sense the inductor current. The copper wire of inductor has a constant
temperature coefficient of 3850 PPM, and therefore the maximum inductor DCR can be calculated from Equation
(10), where R
L_MAX
and R
L_ROOM
are the inductor DCR at maximum temperature T
L_MAX
and room temperature
T_
ROOM
respectively.
(
10
3850
1
_
_
_
MAX
L
ROOM
L
MAX
L
T
R
R
+
=
The current sense amplifier gain of IR3086 decreases with temperature at the rate of 1470 PPM, which
compensates part of the inductor DCR increase. The phase IC die temperature is only a couple of degrees Celsius
higher than the PCB temperature due to the low thermal impedance of MLPQ package. The minimum current sense
amplifier gain at the maximum phase IC temperature T
IC_MAX
is calculated from Equation (11).
(
10
1470
1
_
_
_
MAX
IC
ROOM
CS
MIN
CS
T
G
G
=
The total input offset voltage (V
CS_TOFST
) of current sense amplifier in phase ICs is the sum of input offset
(V
CS_OFST)
of the amplifier itself and that created by the amplifier input bias currents flowing through the current
sense resistors R
CS+
and R
CS-
.
+
=
CSIN
CS
CSIN
OFST
CS
TOFST
CS
R
I
R
I
V
V
_
_
The over current limit is set by the external resistor R
OCSET
as defined in Equation (13), where I
LIMIT
is
the required
over current limit. I
OCSET,
the bias current of OCSET pin, changes with switching frequency setting resistor R
OSC
and is determined by the curve in Figure 14. K
P
is the ratio of inductor peak current over average current in each
phase and is calculated from Equation (14).
I
R
)
1
[
_
_
+
+
=
)]
6
ROOM
T
(10)
)]
6
ROOM
T
(11)
+
+
CS
(12)
OCSET
MIN
CS
TOFST
CS
P
MAX
L
LIMIT
n
OCSET
I
G
V
K
R
/
]
_
(13)
n
I
f
V
L
/
V
V
V
(
K
O
SW
I
O
O
I
P
)
/(
)
=
(14)
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IR3082M 制造商:IRF 制造商全稱:International Rectifier 功能描述:XPHASE AMD OPTERON/ATHLON 64 CONTROL IC
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