IR3523MTRPBF International Rectifier, IR3523MTRPBF Datasheet - Page 32

• Manufacturer Part Number: IR3523MTRPBF
• Description: IC XPHASE3 CTLR VR11.1 40-MLPQ
• Manufacturer: International Rectifier
• Series: XPhase3™r

Specifications of IR3523MTRPBF

• Applications: Processor
• Current - Supply: 10mA
• Voltage - Supply: 4.75 V ~ 7.5 V
• Operating Temperature: 0°C ~ 100°C
• Mounting Type: Surface Mount
• Package / Case: 40-MLPQ
• Ic Function: Dual Output Control IC
• Supply Voltage Range: 4.75V To 7.5V
• Operating Temperature Range: 0°C To +150°C
• Digital Ic Case Style: MLPQ
• No. Of Pins: 40
• Controller Type: XPhase
• Rohs Compliant: Yes
• Package: 40-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

The over current set resistor (Rocset) can be calculated as follows:
VCCL Programming Resistor R
Choose VCCL=7V to maximize the converter efficiency. Pre-select R
No Load Offset Setting Resistor RFB11 and Adaptive Voltage Positioning Resistor RDRP11 for
Output1
Given the desired offset voltage (V
ELECTRICAL CHARACTERISTICS Table, the effective offset resistor value R
Adaptive voltage positioning lowers the converter voltage by R
the converter. RDRP11 is calculated with the following equation:
In the case of thermal compensation is required, use equation (14) to (17) to select the R
R
=
R
=
R
R
R
OCSET
OCSET
VCCLFB
FB
DRP
(
(
125
42
11
1
3
11
=
2
1
∗
=
2
Page 32 of 37
∗
=
=
V
. 0
=
[
. 0
[
R
O
52
I
I
R
_
FB
47
I
LIMIT
LIMIT
VCCL
VCCLFB
NLOFST
n
n
FB
11
*
*
1
10
∗
10
∗
∗
R
−
−
n
R
1
R
3
−
L
*
. 1
L
∗
L
=
3
. 1
_
∗
∗
23
∗
∗
ROOM
R
. 1
23
38
20
1 (
1 (
. 1
O
156
+
+
=
23
*
*
K
K
10
10
20
*
P
* )
P
* )
)
G
)
−
*
−
7
+
3
6
+
10
CS
32
32
−
V
V
=
CS
. 1
VCCLFB1
3
CS
5 .
5 .
*
=
23
526
_
. 1
_
TOFST
/(
O_NLOFST
/(
523
TOFST
23
38
38
Ω
=
*
*
]
*
=
and R
. 4
]
∗
10
. 0
10
∗
1
G
26
523
G
*
47
CS
−
−
k
CS
) and calculating the FB1 sink current using the equation in the
6
6
6
Ω
/
)
Ω
*
*
)
VCCLFB2
/
I
=
10
10
=
OCSET
I
(Actual Value).
OCSET
20
21
−
−
3
3
.
*
.
k 6
,
k 6
32
,
Ω
Ω
5 .
.
,
=
O
*I
. 1
O,
33
where R
VCCLFB1
K
Ω
.
O
=20k , and calculate R
FB11
is the required output impedance of
can be determined by:
FB
June 20, 2008
network resistors.
IR3523
VCCLFB2.