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IR3080PBF Datasheet(PDF) 29 Page - International Rectifier

Part # IR3080PBF
Description  XPHASETM VRD10 CONTROL IC WITH VCCVID & OVERTEMP DETECT
PDF  41 Pages
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Manufacturer  IRF [International Rectifier]
Direct Link  http://www.irf.com
Logo IRF - International Rectifier

IR3080PBF Datasheet(HTML) 29 Page - International Rectifier

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IR3080
PbF
Ω
=
∗
∗
∗
=
∗
∗
∗
=
−
−
k
R
n
G
R
R
R
O
MIN
CS
MAX
L
FB
DRP
21
.
1
10
*
91
.
0
6
2
.
30
10
*
61
.
0
365
3
3
_
_
Control IC Over Temperature Setting Resistors RHOTSETC1 and RHOTSETC2
Set the temperature threshold at 115 ºC, which corresponds to the IC die temperature of 116 ºC. Calculate the
HOTSET threshold voltage corresponding to the temperature thresholds.
V
T
V
J
HOTSET
79
.
1
241
.
1
116
10
*
73
.
4
241
.
1
*
10
*
73
.
4
3
3
=
+
∗
=
+
=
−
−
, Choose RHOTSETC1=20.0kΩ,
Ω
=
−
∗
=
−
∗
=
k
V
V
V
R
R
HOTSET
BIAS
HOTSET
HOTSETC
HOTSETC
15
.
7
79
.
1
8
.
6
79
.
1
10
*
20
3
1
2
Body Braking Related Resistors RBBFB and RBBDRP
N/A. The body braking during Dynamic VID is disabled.
IR3086A EXTERNAL COMPONENTS
PWM Ramp Resistor RPWMRMP and Capacitor CPWMRMP
Set PWM ramp magnitude VPWMRMP=0.8V. Choose 220pF for PWM ramp capacitor CPWMRMP, and calculate the
resistor RPWMRMP,
)]
ln(
)
[ln(
PWMRMP
DAC
IN
DAC
IN
PWMRMP
SW
IN
O
PWMRMP
V
V
V
V
V
C
f
V
V
R
−
−
−
−
∗
∗
∗
=
Ω
=
−
−
−
−
∗
∗
∗
=
−
k
1
.
16
)]
8
.
0
35
.
1
12
ln(
)
35
.
1
12
[ln(
10
*
220
10
*
400
12
33
.
1
12
3
, Choose RPWMRMP=16.2kΩ
Inductor Current Sensing Capacitor CCS+ and Resistors RCS+ and RCS-
Choose CCS+=47nF and calculate RCS+,
Ω
=
=
=
−
−
−
+
+
k
C
R
L
R
CS
L
CS
0
.
10
10
*
47
)
10
*
47
.
0
/(
10
*
220
9
3
9
The bias currents of CSIN+ and CSIN- are 0.25uA and 0.4uA respectively. Calculate resistor RCS-,
Ω
=
∗
=
∗
=
+
−
k
R
R
CS
CS
2
.
6
10
*
0
.
10
4
.
0
25
.
0
4
.
0
25
.
0
3
, Choose RCS-=6.19kΩ
Over Temperature Setting Resistors RHOTSET1 and RHOTSET2
Use central over temperature setting and set the temperature threshold at 115 ºC, which corresponds the IC die
temperature of 116 ºC. Calculate the HOTSET threshold voltage corresponding to the temperature thresholds.
V
T
V
J
HOTSET
79
.
1
241
.
1
116
10
*
73
.
4
241
.
1
*
10
*
73
.
4
3
3
=
+
∗
=
+
=
−
−
Pre-slect RHOTSET1=10.0kΩ,
Ω
=
−
∗
=
−
∗
=
k
V
V
V
R
R
HOTSET
BIAS
HOTSET
HOTSET
HOTSET
57
.
3
79
.
1
8
.
6
79
.
1
10
*
10
3
1
2
Phase Delay Timing Resistors RPHASE1 and RPHASE2
Use central over temperature setting and set the temperature threshold at 115 ºC, which corresponds the IC die
temperature of 116 ºC. Calculate the HOTSET threshold voltage corresponding to the temperature thresholds.
Page 29



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