IR3502MPBF International Rectifier, IR3502MPBF Datasheet - Page 28

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IR3502MPBF

Manufacturer Part Number
IR3502MPBF
Description
Complete VR11.0 or VR11.1 power solution.
Manufacturer
International Rectifier
Datasheet

Specifications of IR3502MPBF

Package
32-Lead MLPQ
Circuit
X-Phase Control IC
Switch Freq (khz)
250kHz to 1.5MHz
Pbf
PbF Option Available
Droop Resistor
The inductor DC resistance is utilized to sense the inductor current. The copper wire of inductor has a constant
temperature coefficient of 3850 ppm/° C, and therefore the maximum inductor DCR can be calculated from (15),
where R
respectively. After the thermal compensation is achieved using the procedure given above, the droop resistance
can be calculated using the following equation.
Over-current Threshold
No Load Output Voltage Setting Resistor R
A resistor between VSETPT pin and VDAC is used to create output voltage offset V
difference between V
I
Once the current report gain and the thermal compensation are calculated the OCP threshold is calculated using the
following expression.
VSETPT
is the current flowing out of VSETPT pin as shown in Figure 19.
L_tmax
Page 28 of 39
and R
DAC
L_room
voltage and output voltage at no load condition. R
C
TH
I
are the inductor DCR at maximum temperature T
OCP
=
=
RTHERM
1
3
RTCMP
R
R
B
RTHERM
t
t
TH
RTCMP
R
_
_
R
t
room
L
max
DRP
_
=
room
R
room
VSETPT
n
RTHERM
1
=
=
=
=
G
2
VSETPT
t
RTHERM
1
3
3
3
max
cs
=
⋅  
B
=
K
K
K
=
R
K
TH
R
R
V
1
THERM
THERM
t
FB
c
RTHERM
c
o
+
O
_
,
1
I
+
_
_
t
room
VSETPT
max
_
(
t
room
RTCMP
max
NLOFST
t
max
 
(
_
_
+
B
G
room
room
TH
2
R
CS
RTHERM
t
 
_
)
. 1
RTHERM
) 2
room
2
t
1
max
17
R
1
II
1
n
4
L
(
+
RTCMP
_
e
1
RTCMP
RTCMP
ROOM
RTCMP
β
R
C
THERM
RTCMP
t
TH
_
t
1
t
max
room
max
∗  
1
273
+
1
+
RTHERM
3
VSETPT
3
3
1
RTHERM
T
R
1
max
t
+
_
1
room
max
273
RTCMP
R
+
1
T
t
and room temperature T
is determined by (26), where
room
_
room
_
t
max
room
3
 
O_NLOFST,
)
July 28, 2009
IR3502
which is the
(17)
(18)
(19)
(20)
(21)
(22)
(23)
room
.
(24)
(25)
(26)

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