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)： 23/34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
=0.8V. Choose 220pF for PWM ramp capacitor C
PWMRMP
, and calculate the
resistor R
PWMRMP
,
V
R
33
.
12
3
)]
ln(
)
[ln(
PWMRMP
V
DAC
V
IN
DAC
V
IN
PWMRMP
SW
IN
O
PWMRMP
V
V
C
f
V
=
=
=
k
1
16
)]
8
35
.
12
ln(
)
35
.
12
[ln(
10
*
220
10
*
400
12
, choose R
PWMRMP
=16.2k
Inductor Current Sensing Capacitor
C
CS+
and Resistors
R
CS+
and
R
CS-
Choose C
CS+
=47nF 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
0
10
Over Temperature Setting Resistors
R
HOTSET1
and
R
HOTSET2
Use central over-temperature setting and 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.
T
V
J
HOTSET
.
241
.
116
10
*
73
.
241
.
*
10
*
73
.
=
+
=
+
=
Pre-select R
HOTSET1
=10.0k
,
=
V
V
HOTSET
BIAS
79
.
8
Phase Delay Timing Resistors
R
PHASE1
and
R
PHASE2
Use central over-temperature setting and 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.
The phase delay resistor ratios for phases 1 to 6 at 400kHz of switching frequencies are RA
PHASE1
=0.628,
RA
PHASE2
=0.415, RA
PHASE3
=0.202, RA
PHASE4
=0.246, RA
PHASE5
=0.441 and RA
PHASE6
=0.637 starting from down-
slope. Pre-select R
PHASE11
=R
PHASE21
=R
PHASE31
=R
PHASE41
=R
PHASE51
= R
PHASE61
=10k
,
RA
R
PHASE
PHASE
628
.
1
1
1
R
PHASE22
=7.15k
, R
PHASE32
=2.55k
, R
PHASE42
=3.24k
, P
PHASE52
=7.87k
, R
PHASE62
=17.4k
=
=
=
+
+
k
C
L
CS
0
10
)
10
*
47
9
.
/(
10
*
220
3
9
V
79
3
3
=
=
k
V
R
R
HOTSET
HOTSET
HOTSET
57
.
79
.
10
*
10
3
1
2
=
=
=
k
R
RA
PHASE
PHASE
9
16
10
*
10
628
.
3
11
1
12
Page 23 of
34
9/30
/04
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