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IR3500MPBF Datasheet(PDF) 39 Page - International Rectifier

Part # IR3500MPBF
Description  XPHASE3TM VR11.0 & AMD PVID CONTROL IC
PDF  47 Pages
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Manufacturer  IRF [International Rectifier]
Direct Link  http://www.irf.com
Logo IRF - International Rectifier

IR3500MPBF Datasheet(HTML) 39 Page - International Rectifier

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IR3500
Page 39 of 47
June 12, 2007
The soft start time is
mS
I
C
TD
CHG
DEL
SS
1
.
2
10
*
5
.
52
1
.
1
*
10
*
1
.
0
1
.
1
*
2
6
6
/
=
=
=
−
−
The VID sample delay time is
mS
I
C
TD
CHG
DEL
SS
33
.
1
10
*
5
.
52
7
.
0
*
10
*
1
.
0
)
1
.
1
4
.
1
2
.
3
(
*
3
6
6
/
=
=
−
−
=
−
−
VID rise time is
mS
I
V
C
TD
CHG
DAC
DEL
SS
38
.
0
10
*
5
.
52
1
.
1
3
.
1
*
10
*
1
.
0
1
.
1
*
4
6
6
/
=
−
=
−
=
−
−
The VR ready delay time is
mS
TD
TD
I
C
TD
CHG
DEL
SS
37
.
1
4
10
*
5
.
52
92
.
0
*
10
*
1
.
0
4
)
3
92
.
3
(
*
5
6
6
/
=
−
=
−
−
=
−
−
Minimum over current fault latch delay time is
ms
I
C
t
OCDISCHG
DEL
SS
OCDEL
21
.
0
10
*
55
12
.
0
*
10
*
1
.
0
12
.
0
*
6
6
/
=
=
=
−
−
VDAC Slew Rate Programming Capacitor CVDAC and Resistor RVDAC
Calculate the VDAC down-slope slew-rate programming capacitor from the required down-slope slew rate. The
up-slope slew rate is the same as the down-slope slew rate.
nF
SR
I
C
DOWN
SINK
VDAC
18
10
/
10
*
5
.
2
10
*
44
6
3
6
=
=
=
−
−
−
Calculate the programming resistor.
Ω
=
+
=
+
=
−
−
−
10
)
10
*
18
(
10
*
2
.
3
5
.
0
10
*
2
.
3
5
.
0
2
9
15
2
15
VDAC
VDAC
C
R
Over Current Setting Resistor ROCSET
The room temperature is 25ºC and the target PCB temperature is 100 ºC. The phase IC die temperature is about
1 ºC higher than that of phase IC, and the inductor temperature is close to PCB temperature.
Calculate Inductor DC resistance at 100 ºC,
Ω
=
−
∗
+
∗
=
−
∗
+
∗
=
−
−
−
m
T
T
R
R
ROOM
MAX
L
ROOM
L
MAX
L
64
.
0
)]
25
100
(
10
*
3850
1
[
10
*
5
.
0
)]
(
10
*
3850
1
[
6
3
_
6
_
_
Set the over current limit at 135A. From Figure 22, the bias current of OCSET pin (IOCSET) is 40uA with
ROSC=15k . The total current sense amplifier input offset voltage is 0.3mV, which includes the offset created by
the current sense amplifier (CSA) input bias current through the resistor RCS.
mV
V
TOFST
CS
3
.
0
_
=



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