IR3080 International Rectifier, IR3080 Datasheet - Page 33

• Manufacturer Part Number: IR3080
• Description: XPHASE VRD10 CONTROL IC WITH VCCVID & OVERTEMP DETECT
• Manufacturer: International Rectifier

Control IC Over Temperature Setting Resistors R
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.
Body Braking Related Resistors R
N/A. The body braking during Dynamic VID is disabled.
IR3086 EXTERNAL COMPONENTS
PWM Ramp Resistor R
Set PWM ramp magnitude V
resistor R
Inductor Current Sensing Capacitor C
Choose 47nF for capacitor C
The bias currents of CSIN+ and CSIN- are 0.25uA and 0.4uA respectively. Calculate resistor R
Combined Over Temperature and Phase Delay Setting Resistors R
The over temperature setting resistor divider is combined with the phase delay resistor divider. Set the temperature
threshold at 115 ºC, which corresponds the IC die temperature of 116 ºC, and calculate the HOTSET threshold
voltage corresponding to the temperature thresholds.
The phase delay resistor ratios for phases 1 to 6 at 800kHz of switching frequencies are RA
RA
slope.
V
V
R
R
R
R
R
HOTSET
CS
HOTSET
DRP
PWMRMP
HOTSETC
CS
PHASE2
+
−
Page 33 of 41
=
=
=
L
C
=
. 0
R
0
=
=
CS
2
FB
4 .
=
12
25
PWMRMP
R
=0.432, RA
. 4
. 4
=
L
+
V
∗
∗
73
∗
73
IN
R
=
R
800
R
HOTSETC
L
*
V
*
*
100
CS
_
10
10
BIAS
n
f
MAX
*
+
SW
∗
10
−
,
−
*
=
3
3
R
10
−
*
3
O
*
∗
∗
47
. 0
1
C
0
V
T
∗
T
PHASE3
−
G
∗
25
4 .
9
J
HOTSET
PWMRMP
100
J
*
V
CS
/(
PWMRMP
10
+
+
HOTSET
∗
0
_
. 1
. 1
*
5 .
. 4
−
MIN
10
9
241
241
22
*
CS+
=0.198, RA
PWMRMP
10
−
*
*
=
[ln(
12
=
=
10
−
=
3
162
and calculate R
and Capacitor C
. 4
. 4
)
10
∗
3
V
. 1
73
[ln(
=
73
IN
=
6
*
∗
28
BBFB
6
8 .
. 4
10
*
=0.75V. Choose 100pF for PWM ramp capacitor C
. 2
*
. 0
−
∗
12
22
10
10
−
61
64
. 0
V
V
3
PHASE4
. 1
CS+
O
DAC
−
k
−
∗
91
−
k
*
Ω
3
79
3
and R
. 1
. 1
Ω
10
∗
*
∗
79
) 3
)
10
116
and Resistors R
116
−
−
−
3
−
=
ln(
*
=0.206, RA
ln(
3
+
BBDRP
. 3
CS+,
+
30
V
. 1
12
. 1
57
PWMRMP
IN
2 .
241
241
HOTSETC1
k
−
−
=
Ω
1
V
576
3 .
=
=
DAC
. 1
. 1
−
Ω
79
. 0
79
PHASE5
−
75
V
V
V
CS+
PWMRMP
)]
and R
, choose R
=
=0.401 and RA
and R
18
.
HOTSETC2
k 2
)]
PHASEx1,
Ω
CS-
HOTSETC1
R
PHASE6
PHASEx2
=10.0kΩ,
=0.597 starting from down-
PWMRMP
and R
CS-
PHASEx3
, and calculate the
,
9
/30/04
IR3080
PHASE1
=0.665,