IR3088AMTRPBF International Rectifier, IR3088AMTRPBF Datasheet - Page 27

• Manufacturer Part Number: IR3088AMTRPBF
• Description: IC XPHASE W/FAULT DET 20L-MLPQ
• Manufacturer: International Rectifier
• Series: XPhase™r

Specifications of IR3088AMTRPBF

• Applications: Processor
• Current - Supply: 10mA
• Voltage - Supply: 8.4 V ~ 14 V
• Operating Temperature: 0°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 20-MLPQ
• Pin Count: 20
• Mounting: Surface Mount
• Package Type: MLPQ
• Case Length: 4mm
• Case Height: 0.88mm
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: IR3088AMTRPBF; IR3088AMTRPBFTR

IR3088A EXTERNAL COMPONENTS
PWM Ramp Resistor R
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
The over temperature setting voltage of Phases 3 and 4 is higher than the phase delay setting voltage,
VBIAS*RA
V
R
R
R
R
R
R
R
Set PWM ramp magnitude V
HOTSET
PHASE21
PHASE51
PHASE61
PWMRMP
CS
PHASEx
PHASEx
PHASE
CS
PHASE
PHASE2
+
−
Page 27 of 33
=
=
33
32
3
2
L
C
R
=
=
CS
=
=
CS
=
=
=
12
PWMRMP
R
=10k , R
=10k , R
=10k , R
. 4
=0.432, RA
PHASEx.
V
PHASEx.
(
L
+
+
V
RA
(
RA
V
V
∗
BIAS
73
IN
=
=
HOTSET
800
HOTSET
PHASE
PHASEx
*
. 4
*
100
10
*
V
22
f
*
1 (
SW
BIAS
10
,
−
*
k
3
V
Pre-select R
Pre-select R
3
−
PHASE22
PHASE52
PHASE62
10
Ω
∗
∗
*
BIAS
−
3
∗
∗
47
RA
R
V
C
−
V
∗
T
PHASE3
RA
−
V
PHASEx
BIAS
9
V
PWMRMP
100
BIAS
J
*
PHASEx
BIAS
∗
/(
HOTSET
PWMRMP
10
PHASE
+
1 (
0
. 1
*
*
5 .
−
−
−
=2.94k , R
=2.32k , R
=8.25k , R
10
9
−
R
1
241
V
*
CS+,
=0.198, RA
RA
)
PHASE
PWMRMP
V
3
10
HOTSET
−
*
=
HOTSET
∗
PHASEX1
PHASE11
12
[ln(
PHASEx
=
−
V
. 1
6
3
and Capacitor C
BIAS
and calculate R
. 4
)
8 .
31
∗
79
V
. 1
[ln(
=
73
*
IN
* )
=
28
∗
1 (
. 4
)
)
=0.75V. Choose 100pF for PWM ramp capacitor C
*
12
−
R
∗
12
. 0
22
10
−
PHASE23
PHASE53
PHASE63
=10k ,
=10k ,
V
PHASEx
V
R
198
.
PHASE4
CS+
. 0
* 1
O
DAC
−
k
PHASE
−
Ω
3
665
1
6
10
) 3 .
∗
∗
8 .
)
and Resistors R
116
6
1
3
−
)
31
−
8 .
−
=
ln(
=
=4.64k
=4.42k
=6.49k
. 1
=0.206, RA
ln(
∗
+
(
=
. 7
CS+,
79
10
V
. 0
12
. 1
PWMRMP
87
. 1 (
IN
665
241
*
−
k
79
10
−
Ω
1
6
V
∗
3
3 .
8 .
−
=
DAC
6
=
. 0
−
. 1
8 .
∗
. 2
. 0
1 (
198
79
PHASE5
6
−
−
8 .
67
75
. 1
−
V
V
CS+
−
. 0
PWMRMP
79
∗
)]
k
. 1
Ω
. 6
665
)
=
79
) 8
∗
and R
=0.401 and RA
18
10
)
∗
.
10
k 2
)]
*
10
*
PHASEx1,
Ω
10
CS-
3
=
3
12
=
1 .
887
k
R
Ω
PHASE6
Ω
PHASEx2
IR3088APbF
PWMRMP
=0.597 starting from down-
and R
May 18, 2009
CS-
, and calculate the
PHASEx3
,
PHASE1
=0.665,