参数资料
型号: IR3092
厂商: International Rectifier
英文描述: 2 PHASE OPTERON, ATHLON, OR VR10.X CONTROL IC
中文描述: 2相皓龙,速龙,或控制IC的VR10.X
文件页数: 28/37页
文件大小: 619K
代理商: IR3092
IR3092
Page 28 of 37
06/25/04
The soft start delay time is
C
t
CHG
The power good delay time is
C
t
CHG
VDAC Slew Rate Programming Capacitor C
DAC
and Resistor R
DAC
mS
I
V
SS
SSDEL
3
10
*
55
3
*
6
10
*
1
*
6
'
mS
V
I
V
O
SS
VccPG
0
10
*
55
)
75
.
*
10
*
1
*
6
6
'
From IR3092 data sheet, the sink current I
SINK
of VDAC pin corresponding to R
OSC
=47.5k
LV
Calculate the VDAC down-slope slew-rate programming capacitor from the required down-slope slew
rate.
I
C
DOWN
10
/
10
5
Choose C
VDAC
=22nF
Calculate the programming resistor.
15
15
10
*
2
5
5
DAC
C
In practice slightly adjust R
DAC
to get desired slew rate.
The source current of VDAC pin is 55uA, and the VDAC up-slope slew rate is
I
SR
VDAC
10
22
X$
nF
SR
SINK
VDAC
20
10
3
50
6
6
2
9
2
10
*
22
10
2
DAC
R
7.1
uS
mV
C
SOURCE
UP
/
5
10
55
9
6
According to the spec, the output current limit set point I
LIMIT
= 100A. The bias current I
OCSET
set by
R
ROSC
is around 26uA. Use Equation (10) to calculate the value of R
OCSET:
)
(
2
fsw
Vin
L
= 52 k
&KRRVH 5
OCSET
=52.3K
No Load Output Voltage Setting Resistor R
FB
and Adaptive Voltage Positioning Resistor R
DRP
The value of the internal current source current I
ROSC
(I
FB
in IR3092 datasheet curve) is 26uA according
to R
ROSC
= 47.5k
6
3
3
6
10
*
26
5
23
*
10
*
1
*
)
10
*
180
*
12
*
10
*
45
.
*
2
)
325
.
12
(
*
325
.
2
100
(
/
5
23
)
*
2
(
OCSET
L
LIMIT
OCSET
I
R
Vo
Vin
Vo
I
R
Over Current Setting Resistor R
OCSET
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