IR3503MTRPBF International Rectifier, IR3503MTRPBF Datasheet - Page 34

• Manufacturer Part Number: IR3503MTRPBF
• Description: IC CTRL XPHASE VR11.0/1 32-MLPQ
• Manufacturer: International Rectifier
• Series: XPhase3™r

Specifications of IR3503MTRPBF

• Applications: Processor
• Current - Supply: 8mA
• Voltage - Supply: 4.75 V ~ 7.5 V
• Operating Temperature: 0°C ~ 100°C
• Mounting Type: Surface Mount
• Package / Case: *
• Package: 32-Lead MLPQ
• Circuit: X-Phase Control IC
• Switch Freq (khz): 250kHz to 1.5MHz
• Pbf: PbF Option Available
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: IR3503MTRPBFTR

Droop Resistor
Based on the above calculation R
Pre-select R
to find out R
Over Current Threshold
The OCP threshold is fixed at 1.17 V above the VDAC voltage. Therefore, it can be determined based on (25)
depending upon the number of active phases in the system as shown below:
Thermistor R
Choose NTC thermistor R
resistance at the allowed maximum temperature T
Select R
range.
Then calculate R
R
R
TMAX
HOTSET
=
1
R
HOTSET2
Page 34 of 39
=
THERM
(
R
DRP
FB
TMAX
THERM
5
= 2 k
*
1
.
4
_
EXP
_
HOTSET1
_
= 931
phase
+
phase
phase
[
R
B
and Over Temperature Setting Resistors R
HOTSET
THERM
and using R
_
_
_
system
1
corresponding to the allowed maximum temperature T
system
to linearize the NTC, which has non-linear characteristics in the operational temperature
system
6 .
2
( *
THERM
)
T
( *
L
R
_
VCCL
1
DRP
_
MAX
_
_
DRP
I
I
O
= 2.2 k , which has a constant of B
I
OCP
OCP
=
OCP
= 0.8 m , G
−
can be selected to obtain specific output impedance.
1
3
T
−
=
=
=
_
∗
. 1



ROOM



1



0
1
3
) 6
1
3
1
3
2
8 .
⋅
⋅



⋅
k



m
=



Ω
. 0
)]
. 0
. 0
Ω
(
29
=
29
142
29
∗
2
CS
5
m
5
m
2 .
5



m
MAX
⋅
= 33 along with the converter parameters can be plugged into (24)
33
*
+
⋅
33
⋅
33
10
33
931
∗
is,

⋅ 

3

⋅ 

. 0

⋅ 

1
5
*



* )
6 .



EXP
29
1



1
1
+
+
7 (
+
m
. 1
(
. 1
[
(
. 9
. 1
(
3520
. 9
−

∗ 

17
. 9
17
17
24
24
. 1
24



k
) 6
1
( *
k
k
)
HOTSET1
+
)
II
)
273
II
=
II
. 7
(
(
. 9
. 3
(
1
. 9
699
1
1
. 9
1
1
+
k
411
k
k
63
k
411
115
411
THERM
k
k
k
Ω
k
and R



k
−
+
+
=
+
273
, choose R
10
10
13
10
= 3520, and the NTC thermistor
MAX
k
1
k
+
k
.
)
HOTSET2
87
)
25
)















as shown below:
k
)]



×
Ω
×
×
=









February 12, 2010
142
5
5
1
HOTSET1
5
4
5









Ω
=
=
=
252
50
202
5 .
IR3503
6 .
A
A
= 3.65 k
A