IR3081M International Rectifier, IR3081M Datasheet - Page 31

• Manufacturer Part Number: IR3081M
• Description: IC PHASE CONTROLLER 28-MLPQ
• Manufacturer: International Rectifier
• Series: XPhase™r

Specifications of IR3081M

• Applications: Processor
• Current - Supply: 11mA
• Voltage - Supply: 9.5 V ~ 14 V
• Operating Temperature: 0°C ~ 100°C
• Mounting Type: Surface Mount
• Package / Case: 28-MLPQ
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Other names: *IR3081M

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 to 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.
The over temperature setting voltage of phases 1, 2, 5, and 6 is lower than the phase delay setting voltage,
VBIAS*RA
R
R
R
V
R
R
R
R
R
CS
HOTSET
PHASE21
PHASE51
PHASE61
PWMRMP
PHASEx
PHASEx
CS
PHASE2
+
−
Page 31 of 39
=
=
3
2
L
C
=
. 0
0
=
=
=
CS
4 .
=
12
25
PWMRMP
R
=10kΩ, R
=10kΩ, R
=10kΩ, R
=0.432, RA
. 4
PHASEx.
V
(
L
+
V
RA
V
∗
BIAS
∗
73
IN
=
HOTSET
800
R
PHASEx
*
*
100
CS
10
*
f
*
+
1 (
SW
10
,
−
*
Pre-select R
V
=
3
−
PHASE22
PHASE52
PHASE62
10
∗
*
BIAS
3
∗
∗
47
. 0
RA
R
C
0
V
∗
T
PHASE3
−
25
4 .
PHASEx
9
PWMRMP
100
BIAS
J
*
PHASEx
∗
/(
PWMRMP
10
+
∗
1 (
0
. 1
*
5 .
. 4
−
−
−
=2.94kΩ, R
=2.32kΩ, R
=8.25kΩ, R
10
9
1
241
22
V
*
CS+,
=0.198, RA
RA
)
PWMRMP
10
HOTSET
−
*
=
*
PHASE11
[ln(
12
PHASEx
=
10
−
. 1
6
3
and Capacitor C
and calculate R
. 4
)
8 .
∗
3
79
V
. 1
[ln(
=
73
*
IN
=
* )
28
BBFB
∗
. 4
1 (
)
=0.75V. Choose 100pF for PWM ramp capacitor C
. 2
*
12
−
12
R
22
10
−
PHASE23
PHASE53
PHASE63
61
=10kΩ,
V
PHASEx
V
.
PHASE4
CS+
. 0
* 1
O
DAC
−
k
−
k
Ω
3
665
and R
. 1
Ω
10
∗
) 3
)
and Resistors R
116
1
3
−
)
−
=
ln(
=
=4.64kΩ
=4.42kΩ
=6.49kΩ
=0.206, RA
ln(
BBDRP
+
(
. 7
CS+,
V
. 0
12
. 1
87
PWMRMP
IN
665
241
−
k
−
Ω
1
6
V
∗
3 .
8 .
=
DAC
6
. 1
−
8 .
∗
. 0
1 (
79
PHASE5
−
−
75
. 1
−
V
V
CS+
. 0
PWMRMP
79
)]
665
)
=
∗
=0.401 and RA
and R
18
10
)
.
k 2
)]
*
10
PHASEx1,
Ω
CS-
3
=
12
1 .
k
R
Ω
PHASE6
PHASEx2
=0.597 starting from down-
PWMRMP
and R
CS-
PHASEx3
, and calculate the
,
10/01
IR3081
PHASE1
/04
=0.665,