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參數(shù)資料
| 型號(hào)： | IR3082M |
| 廠商： | International Rectifier |
| 英文描述： | XPHASE AMD OPTERON/ATHLON 64 CONTROL IC |
| 中文描述： | XPHASE AMD皓龍/速龍64控制IC |
| 文件頁(yè)數(shù)： | 27/33頁(yè) |
| 文件大小： | 444K |
| 代理商： | IR3082M |
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IR3082
Page 27 of 27
12/17/04
IR3086 EXTERNAL COMPONENTS
PWM Ramp Resistor
R
RAMP
and Capacitor C
RAMP
Set PWM ramp magnitude V
PWMRMP
=0.8V. Choose 100pF for PWM ramp capacitor C
PWMRMP
, and calculate the
resistor R
PWMRMP
,
V
R
30
.
12
3
)]
ln(
)
[ln(
PWMRMP
V
DAC
V
IN
DAC
V
IN
PWMRMP
SW
IN
O
PWMRMP
V
V
C
f
V
=
=
=
k
9
17
)]
8
30
.
12
ln(
)
30
.
12
[ln(
10
100
10
600
12
, choose R
PWMRMP
=18.2k
Inductor Current Sensing Capacitor
C
CS+
and Resistors
R
CS+
and
R
CS-
Choose C
CS+
=47nF and calculate R
CS+,
=
=
+
C
CS
10
47
Choose
=
+
k
R
CS
5
11
. The bias currents of CSIN+ and CSIN- are 0.25uA and 0.4uA respectively. Calculate resistor
R
CS-
,
25
.
4
Over Temperature Setting Resistors
R
HOTSET1
and
R
HOTSET2
Use central over temperature setting and 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.
V
T
V
J
HOTSET
79
.
241
.
116
10
73
.
241
.
10
73
.
=
+
=
+
=
=
V
V
HOTSET
BIAS
79
.
8
Phase Delay Timing Resistors
R
PHASE1
and
R
PHASE2
The phase delay resistor ratios for phases 1 to 5 at 600kHz of switching frequencies are RAPHASE1=0.646,
RAPHASE2=0.400, RAPHASE3=0.158, RAPHASE4=0.291 and RAPHASE5=0.561 starting from down-slope. Pre-
select RPHASE11=RPHASE21=RPHASE31=RPHASE41=RPHASE51= RPHASE61=20k
,
RA
R
PHASE
PHASE
646
.
1
1
1
R
PHASE22
=13.3k
, R
PHASE32
=3.74k
, R
PHASE42
=8.2k
, P
PHASE52
=25.5k
Bootstrap Capacitor C
BST
Choose C
BST
=0.1uF
Decoupling Capacitors for Phase IC and Power Stage
Choose C
VCC
=0.1uF, C
VCCL
=0.1uF
=
+
k
R
L
R
L
CS
2
11
)
10
42
9
.
/(
10
220
3
9
=
=
=
+
k
R
R
CS
CS
19
.
10
0
10
4
25
.
3
, choose R
CS-
=7.15k
3
3
, choose R
HOTSET1
=20.0k
,
=
=
k
V
R
R
HOTSET
HOTSET
HOTSET
14
.
79
.
10
20
3
1
2
=
=
=
k
R
RA
PHASE
PHASE
5
36
10
20
646
.
3
11
1
12
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