IR3502MTRPBF International Rectifier, IR3502MTRPBF Datasheet - Page 32

• Manufacturer Part Number: IR3502MTRPBF
• Description: IC XPHASE3 CONTROLLER 32-MLPQ
• Manufacturer: International Rectifier
• Series: XPhase3™r

Specifications of IR3502MTRPBF

• Applications: Processor
• Current - Supply: 8mA
• Voltage - Supply: 8 V ~ 16 V
• Operating Temperature: 0°C ~ 100°C
• Mounting Type: Surface Mount
• Package / Case: 32-MLPQ
• 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: IR3502MTRPBFTR

Droop Resistor
Based on the above calculation R
Pre-select R
find out R
Over Current Threshold
The OCP is fixed at 1.17 V above the VDAC voltage. Therefore, it can be determined as follows
VCCL Drive Resistor R
example, it’s assumed that IR6622 and IRF6628 are used as the control and sync FET respectively.
The minimum input voltage is assumed to be 10.5 V and VCCL is fixed at 6.5V for this design.
Choose a transistor with β(min) of 50. The maximum input voltage is assumed 13.5 V,
Thermistor R
Choose NTC thermistor R
resistance at the allowed maximum temperature T
Select R
range. Then calculate R
R
R
The maximum drive current for the linear regulator is dependent on the type of MosFET used. For this
TMAX
HOTSET
=
1
R
HOTSET2
Page 32 of 39
=
THERM
DRP
(
R
FB
.
TMAX
THERM
=1 k
*
EXP
= 931 to linearize the NTC, which has non-linear characteristics in the operational temperature
+
[
R
B
and Over Temperature Setting Resistors R
and using R
HOTSET
THERM
HOTSET1
VCCLDRV
I
I
1
drive
OCP
6 .
2
( *
THERM
)
T
_
( *
=
R
avg
L
_
VCCL
DRP



1
MAX
1
3
corresponding to the allowed maximum temperature TMAX.
o
DRP
=
=0.8 m , G
⋅
=2.2k , which has a constant of B



=
[
−
. 0
(
R
can be selected to obtain specific output impedance.
30
1
3
VCCLDRV
T
−
35
_
∗
. 1
3 .
ROOM
m
1
0
5
) 6
n
1
8 .
⋅
33
13
k
+
m
=
Ω
=
)]
11
5 .
5 .
cs
Ω
(
10
V
=
142
=33.5 along with the converter parameters can be plugged into (24) to

⋅ 

n
700
∗
2
−
5 .
)
2 .






MAX
0
1
⋅
V
195
Ω
*
+
33
7 .
700
+
10
−
931
. 1
−
(
5 .
. 8
0
mA
3
is,
6
17
1
k
7 .
*
5 .
∗
457
* )
6 .
5
EXP
V
+
. 0
/
=
30
10
7 (
35
−
k
9
[
mA
)
6
3520
−
m
II
mA
5 .
. 1
(
V

∗ 

1
<
. 8
k
]
) 6
( *
10
837
⋅
=
HOTSET1



5
273
1
mA
700
=
+
=
k
. 3
1
195
+
. 5
+
Ω
63
115
10
618
1
THERM
k
k
mA
k
Ω
and R
−
)
k



273
, choose R






=
=3520, and the NTC thermistor
=
1
+
HOTSET2
7
218
25
5 .
)]
k
9 .
Ω
=
A
142
HOTSET1
Ω
July 28, 2009
=3.65k .
IR3502