ir3092 International Rectifier Corp., ir3092 Datasheet - Page 28

• Manufacturer Part Number: ir3092
• Description: 2 Phase Opteron, Athlon, Or Vr10.x Control Ic
• Manufacturer: International Rectifier Corp.

Over Current Setting Resistor R
VDAC Slew Rate Programming Capacitor C
The soft start delay time is
The power good delay time is
From IR3092 data sheet, the sink current I
Calculate the VDAC down-slope slew-rate programming capacitor from the required down-slope slew
rate.
Choose C
Calculate the programming resistor.
In practice slightly adjust R
The source current of VDAC pin is 55uA, and the VDAC up-slope slew rate is
According to the spec, the output current limit set point I
R
No Load Output Voltage Setting Resistor R
The value of the internal current source current I
to R
Page 28 of 37
t
t
C
R
SR
R
VccPG
SSDEL
ROSC
VDAC
OCSET
DAC
UP
ROSC
is around 26uA. Use Equation (10) to calculate the value of R
= 52 k
0
= 47.5k
C
I
C
C
(
SR
VDAC
5 .
SOURCE
I
SS
SS
I
VDAC
I
I
LIMIT

CHG
SINK
CHG
DOWN
2
*
*
3
=22nF
'
'
2 .
V
C
V

DAC
2
Vo
10
55
22
2
0
0
2
5 .
L

1 .
1 .
15
10
10
50
(
55
Vin
*
*
Vin
10
DAC
10
10


*
6
9
0
10


10

5 .
*
©
3
6
6
to get desired slew rate.
Vo
/
55
fsw
( *

©

1 *
2
OCSET
10
6
6
)
5 .
. 3
*
3 .
3
22

)
mV
10
6
2 .
75
*
R
*

10

6
/
2
L
10
20
uS
3 .
V

O

mS
nF
9
23
SINK
15
DAC

2
FB
.
/ 5
. 1
and Adaptive Voltage Positioning Resistor R
ROSC
) 3
of VDAC pin corresponding to R
and Resistor R
7.1
I
OCSET
OCSET
(I
2
FB
0 .
mS
LIMIT
in IR3092 datasheet curve) is 26uA according
(
=52.3K
100
2
= 100A. The bias current I

DAC
2
OCSET:
*
. 0
. 1
45
325
*
10
( *

6
12
*
12

OSC
. 1
*
325
180
=47.5k
06/25/04
)
*
OCSET
10
3
* )
DRP
IR3092
set by
1
*
26
10
*

3
10
*
23

6
5 .