參數(shù)資料
型號： IR3088M
廠商： International Rectifier
英文描述： XPHASE PHASE IC WITH FAULT AND OVERTEMP DETECT
中文描述： XPHASE相集成電路及超溫故障檢測
文件頁數(shù)： 27/34頁
文件大小： 688K
代理商： IR3088M
IR3088
Body Braking Related Resistors
R
BBFB
and
R
BBDRP
N/A. The body braking during Dynamic VID is disabled.
IR3088 EXTERNAL COMPONENTS
PWM Ramp Resistor
R
PWMRMP
and Capacitor C
PWMRMP
Set PWM ramp magnitude V
PWMRMP
=0.75V. Choose 100pF for PWM ramp capacitor C
PWMRMP
, and calculate the
resistor R
PWMRMP
,
V
R
)]
ln(
)
[ln(
*
*
*
PWMRMP
V
DAC
V
IN
DAC
V
IN
PWMRMP
SW
IN
O
PWMRMP
V
V
C
f
V
=
=
k
2
18
)]
75
.
3
12
ln(
)
12
[ln(
12
10
*
100
3
10
*
800
12
28
.
=
Inductor Current Sensing Capacitor
C
CS+
and Resistors
R
CS+
and
R
CS-
Choose 47nF for capacitor C
CS+,
and calculate R
CS+,
R
L
R
CS
10
*
47
The bias currents of CSIN+ and CSIN- are 0.25uA and 0.4uA respectively. Calculate resistor R
CS-
,
=
=
+
k
R
R
CS
CS
22
.
Combined Over Temperature and Phase Delay Setting Resistors
R
PHASEx1
,
R
PHASEx2
and
R
PHASEx3
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.
T
V
J
HOTSET
.
241
.
116
10
*
73
.
241
.
10
*
73
.
=
+
=
+
=
The phase delay resistor ratios for phases 1 to 6 at 800kHz of switching frequencies are RA
PHASE1
=0.665,
RA
PHASE2
=0.432, RA
PHASE3
=0.198, RA
PHASE4
=0.206, RA
PHASE5
=0.401 and RA
PHASE6
=0.597 starting from down-
slope.
The over temperature setting voltage of phases 1, 2, 5, and 6 is lower than the phase delay setting voltage,
VBIAS*RA
PHASEx.
Pre-select R
PHASE11
=10k
,
=
RA
V
PHASEx
BIAS
1
8
)
1
=
RA
V
PHASEx
BIAS
)
665
.
1
*
8
)
1
*
R
PHASE21
=10k
, R
PHASE22
=2.94k
, R
PHASE23
=4.64k
R
PHASE51
=10k
, R
PHASE52
=2.32k
, R
PHASE53
=4.42k
R
PHASE61
=10k
, R
PHASE62
=8.25k
, R
PHASE63
=6.49k
=
=
=
+
+
k
C
L
CS
22
.
)
10
*
5
/(
10
*
100
9
3
9
V
79
3
3
=
=
k
R
V
V
RA
R
PHASEx
HOTSET
BIAS
PHASEx
PHASEx
1
12
)
665
.
10
*
10
)
79
.
8
665
.
*
)
(
3
1
2
=
=
k
R
V
R
PHASEx
HOTSET
PHASEx
87
.
10
*
1
12
79
.
3
1
3
Page 27 of
34
9/30
/04
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