ir3500m International Rectifier Corp., ir3500m Datasheet - Page 39

• Manufacturer Part Number: ir3500m
• Description: Xphase3 Vr11.0 & Amd Pvid Control Ic
• Manufacturer: International Rectifier Corp.

The soft start time is
The VID sample delay time is
VID rise time is
The VR ready delay time is
Minimum over current fault latch delay time is
VDAC Slew Rate Programming Capacitor C
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.
Calculate the programming resistor.
Over Current Setting Resistor R
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,
Set the over current limit at 135A. From Figure 22, the bias current of OCSET pin (I
R
the current sense amplifier (CSA) input bias current through the resistor R
V
TD
TD
TD
TD
t
C
R
R
OCDEL
VDAC
OSC
L
VDAC
CS
_
2
3
4
5
MAX
_
=
=
=
TOFST
=15k . The total current sense amplifier input offset voltage is 0.3mV, which includes the offset created by
=
=
C
C
C
=
=
=
C
Page 39 of 47
SS
0
SS
SS
SR
5 .
R
C
SS
/
I
/
I
/
L
=
DEL
DEL
DEL
CHG
SINK
+
DOWN
SS
/
_
I
DEL
0
ROOM
3
/
OCDISCHG
I
2 .
3 .
DEL
C
*
1 *
*
CHG
I
I
VDAC
3 (
V
*
mV
( *
CHG
1 .
CHG
=
10
2 .
DAC
∗
*
. 3
1 [
=
2
−
−
. 0
2
5 .
15
+
92
1
. 0
−
12
4 .
*
3850
52
44
* 1
1
=
10
1 .
−
−
5 .
*
0
10
=
1
−
5 .
10
) 3
*
=
*
) 1 .
3
−
10
10
0
+
/
6
−
. 0
−
1 .
10
6
1 *
(
=
−
−
* 1
3
18
6
TD
6
*
55
2 .
−
. 0
∗
1 .
52
6
10
10
*
(
52
*
* 1
10
OCSET
T
=
=
4
*
10
5 .
−
L
5 .
10
−
10
18
2
6
_
−
=
6
*
−
1 .
9
*
MAX
*
15
10
*
nF
)
−
10
mS
1
−
0
2
6
6
. 0
3 .
−
1 .
*
=
−
−
6
52
0
6
−
12
10
*
T
7 .
1
ROOM
10
5 .
1 .
Ω
=
=
VDAC
*
−
. 1
=
6
. 0
10
)]
33
. 0
*
21
=
38
mS
−
. 0
0
6
and Resistor R
ms
mS
5 .
92
*
10
−
−
TD
3
∗
1 [
4
+
=
3850
. 1
37
VDAC
*
10
mS
−
6
CS
∗
(
100
.
−
25
)]
=
. 0
64
m
June 12, 2007
Ω
OCSET
) is 40uA with
IR3500