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參數(shù)資料
| 型號： | 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 |
| 文件頁數(shù)： | 25/33頁 |
| 文件大?。?/td> | 444K |
| 代理商： | IR3082M |
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IR3082
Page 25 of 25
12/17/04
DESIGN EXAMPLE
―
5-PHASE OPTERON CONVERTER
SPECIFICATIONS
Input Voltage: V
I
=12 V
DAC Voltage: V
DAC
=1.3 V
No Load Output Voltage Offset: V
O_NLOFST
=15mV
Maximum Output Current: I
OMAX
=100 ADC
Output Impedance: R
O
=0.75 m
Soft Start Time: t
SS
= 2 mS
Dynamic VID Down-Slope Slew Rate: SR
DOWN
=2.5mV/uS
Over Temperature Threshold: T
PCB
=115 oC
POWER STAGE
Phase Number: n=5
Switching Frequency: f
SW
=600 kHz
Output Inductors: L=220 nH, R
L
=0.42 m
Output Capacitors: C=47uF, R
C
= 2m
, Number Cn=32
IR3082 EXTERNAL COMPONENTS
Oscillator Resistor
Rosc
Once the switching frequency is chosen, R
OSC
can be determined from the curve in Figure 13. For switching
frequency of 600kHz per phase, choose R
OSC
=18.2k
Soft Start Capacitor
C
SS/DEL
Calculate the soft start capacitor from the required soft start time.
t
I
C
O
10
)
15
50
(
3
+
The soft start delay time is
C
I
DISCHG
10
6
V
C
t
CHG
10
66
VDAC Slew Rate Programming Capacitor
C
VDAC
and Resistor
R
VDAC
From Figure 15, the sink current of VDAC pin corresponding to 600kHz (R
OSC
=18.2k
) is 125uA. Calculate the
VDAC down-slope slew-rate programming capacitor from the required down-slope slew rate.
I
C
DOWN
10
/
10
5
Calculate the programming resistor.
+
=
+
=
2
)
10
47
(
VDAC
C
uF
V
SS
CHG
DEL
SS
0988
.
10
2
10
66
3
3
6
/
=
=
=
, choose
uF
C
DEL
SS
1
/
=
ms
C
t
DEL
SS
DEL
SS
OCDEL
5
=
09
.
09
.
6
/
/
=
=
ms
I
O
DEL
SS
VccPG
64
.
)
335
.
6
73
.
10
1
)
73
.
6
/
=
=
=
nF
SR
SINK
VDAC
50
10
3
125
6
6
=
=
=
, Choose C
VDAC
=47nF
=
10
2
5
10
2
5
2
9
15
2
15
VDAC
R
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