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IR3521 Datasheet(PDF) 38 Page - International Rectifier

Part # IR3521
Description  XPHASE3TM AMD SVID CONTROL IC
PDF  45 Pages
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Manufacturer  IRF [International Rectifier]
Direct Link  http://www.irf.com
Logo IRF - International Rectifier

IR3521 Datasheet(HTML) 38 Page - International Rectifier

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IR3521
Page 38
V3.03
VDAC Slew Rate Programming Capacitor CVDAC and Resistor RVDAC
nF
SR
I
C
DOWN
SINK
VDAC
1
.
14
10
*
2
.
3
10
2
.
45
3
6
, Choose CVDAC=22nF
Ohm
C
R
VDAC
VDAC
1
.
7
10
2
.
3
5
.
0
2
15
Over Current Setting Resistor ROCSET
The output1 over current limit is 115A and the output2 over current limit is 25A. From the electrical characteristics
table can get the bias current of OCSET pin (IOCSET) is 26uA with ROSC=23.2 kΩ. The total current sense
amplifier input offset voltage is around 0mV, Calculate constant KP, the ratio of inductor peak current over average
current in each phase,
38
.
0
5
/
115
)
2
10
*
520
12
10
*
120
/(
2
.
1
)
2
.
1
12
(
/
)
2
/(
)
(
1
3
9
n
I
f
V
L
V
V
V
K
LIMIT
SW
I
O
O
I
P
19
.
0
25
)
2
10
*
520
12
10
*
220
/(
2
.
1
)
2
.
1
12
(
2
3
9
P
K
OCSET
CS
TOFST
CS
P
L
LIMIT
OCSET
I
G
V
K
R
n
I
R
/
]
)
1
(
[
1
_
k
6
.
21
)
10
*
26
/(
34
*
)
38
.
1
10
*
52
.
0
5
115
(
6
3
OCSET
CS
TOFST
CS
P
L
LIMIT
OCSET
I
G
V
K
R
n
I
R
/
]
)
1
(
[
2
_
k
4
.
18
)
10
*
26
/(
34
*
)
19
.
1
10
*
47
.
0
1
25
(
6
3
VCCL Programming Resistor RVCCLFB1 and RVCCLFB2
Choose VCCL=7V to maximize the converter efficiency. Pre-select RVCCLFB1=20kΩ, and calculate RVCCLFB2.
k
VCCL
R
R
VCCLFB
VCCLFB
26
.
4
23
.
1
7
23
.
1
*
10
*
20
23
.
1
23
.
1
*
3
1
2
No Load Offset Setting Resistor RFB11, RFB13, RTHERM1 and Adaptive Voltage Positioning Resistor
RDRP11
for Output1
Define RFB_R is the effective offset resistor at room temperature equals to RFB11//(RFB13+RTHERM1). Given the
offset voltage VO_NLOFST above the DAC voltage, calculate the sink current from the FB1 pin IFB1= 26uA using
the equation in the ELECTRICAL CHARACTERISTICS Table, then the effective offset resistor value RFB_R1 can
be determined by:
Ohm
I
V
R
FB
NLOFST
O
R
FB
577
10
*
26
10
*
15
1
6
3
1
_
_
Adaptive voltage positioning lowers the converter voltage by RO*IO, where RO is the required output impedance of
the converter. Pre-select feedback resistor RFB, and calculate the droop resistor RDRP,



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