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IR3502 Datasheet(PDF) 32 Page - International Rectifier

Part # IR3502
Description  XPHASE3TM CONTROL IC
PDF  39 Pages
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Manufacturer  IRF [International Rectifier]
Direct Link  http://www.irf.com
Logo IRF - International Rectifier

IR3502 Datasheet(HTML) 32 Page - International Rectifier

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IR3502
Page 32 of 39
July 28, 2009
Droop Resistor
Based on the above calculation RDRP can be selected to obtain specific output impedance.
Pre-select RFB=1 k
and using Ro=0.8 m , Gcs=33.5 along with the converter parameters can be plugged into (24) to
find out RDRP.
Ω
=


+
∗
∗
∗
Ω
Ω
∗
=
k
k
k
m
m
k
R
DRP
5
.
7
1
618
.
5
1
5
35
.
0
5
.
33
8
.
0
1
3
1
Over Current Threshold
The OCP is fixed at 1.17 V above the VDAC voltage. Therefore, it can be determined as follows
A
k
k
k
II
k
m
I
OCP
9
.
218
1
)
10
837
.
8
(
)
457
.
8
(
1
5
5
.
33
35
.
0
3
1
17
.
1
=
+
+
⋅
⋅
⋅
=
VCCL Drive Resistor RVCCLDRV
The maximum drive current for the linear regulator is dependent on the type of MosFET used. For this
example, it’s assumed that IR6622 and IRF6628 are used as the control and sync FET respectively.
[
]
mA
mA
k
n
n
I
avg
drive
195
5
10
700
)
11
3
.
30
(
_
=
⋅
+
⋅
+
=
The minimum input voltage is assumed to be 10.5 V and VCCL is fixed at 6.5V for this design.
Ω
=
−
−
=
700
30
/
195
5
.
6
7
.
0
5
.
10
mA
V
V
V
R
VCCLDRV
Choose a transistor with β(min) of 50. The maximum input voltage is assumed 13.5 V,
mA
mA
V
10
9
700
5
.
6
7
.
0
5
.
13
<
=
Ω
−
−
Thermistor RTHERM and Over Temperature Setting Resistors RHOTSET1 and RHOTSET2
Choose NTC thermistor RTHERM=2.2k , which has a constant of BTHERM=3520, and the NTC thermistor
resistance at the allowed maximum temperature TMAX is,
Ω
=
+
−
+
=
−
=
142
)]
25
273
1
115
273
1
(
*
3520
[
*
10
*
2
.
2
)]
1
1
(
*
[
*
3
_
_
EXP
T
T
B
EXP
R
R
ROOM
MAX
L
THERM
THERM
TMAX
Select RHOTSET2 = 931
to linearize the NTC, which has non-linear characteristics in the operational temperature
range. Then calculate RHOTSET1 corresponding to the allowed maximum temperature TMAX.
Ω
=
−
+
=
−
+
=
k
VCCL
R
R
R
HOTSET
TMAX
HOTSET
63
.
3
6
.
1
)
6
.
1
7
(
*
)
931
142
(
6
.
1
)
6
.
1
(
*
)
(
2
1
, choose RHOTSET1=3.65k .



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