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IR3084A Datasheet(PDF) 28 Page - International Rectifier

Part # IR3084A
Description  XPHASE TM VR 10/11 CONTROL IC
PDF  45 Pages
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Manufacturer  IRF [International Rectifier]
Direct Link  http://www.irf.com
Logo IRF - International Rectifier

IR3084A Datasheet(HTML) 28 Page - International Rectifier

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IR3084A
Page 28 of 45
10/30/2006
Over Current Setting Resistor
ROCSET
The inductor DC resistance is utilized to sense the inductor current. The copper wire of the inductor has a
constant temperature coefficient of 3850 PPM, and therefore the maximum inductor DCR can be calculated from
Equation (14), where RL_MAX and RL_ROOM are the inductor DCR at maximum temperature TL_MAX and room
temperature T_ROOM respectively.
)]
T
(T
3850*10
[1
R
R
ROOM
L_MAX
6
L_ROOM
L_MAX
−
∗
+
∗
=
−
(14)
The current sense amplifier gain of the IR3086A decreases with temperature at the rate of 1470 PPM, which
compensates part of the inductor DCR increase. The phase IC die temperature is only a couple of degrees
Celsius higher than the PCB temperature due to the low thermal impedance of MLPQ package. The minimum
current sense amplifier gain at the maximum phase IC temperature TIC_MAX is calculated from Equation (15).
)]
T
(T
1470*10
[1
G
G
ROOM
IC_MAX
6
CS_ROOM
CS_MIN
−
∗
−
∗
=
−
(15)
The over-current limit is set by the external resistor ROCSET as defined in Equation (16), where ILIMIT is the
required over current limit. IOCSET, the bias current of the OCSET pin, changes with switching frequency setting
resistor ROSC and is determined by the curve in Figure 14 on page 23. KP is the ratio of inductor peak current to
average current in each phase and is calculated from Equation (17).
OCSET
MIN
CS
CS_TOFST
P
L_MAX
LIMIT
OCSET
I
G
]
V
)
K
(1
R
n
I
[
R
_
∗
+
+
∗
∗
=
(16)
/n
I
2)
f
V
/(L
V
)
V
(V
K
LIMIT
SW
I
FL
O
FL
O
I
P
∗
∗
∗
∗
−
=
_
_
(17)
Where: VI is the input voltage to the converter (nominally 12V).
VO_FL is the output voltage of the converter with droop at the over-current threshold.
L is the value of the output inductors.
fSW is the switching frequency.
ILIMIT is the DC output current of the converter when the over-current fault occurs.
n is the number of phases.



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