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IR3084A Datasheet(PDF) 36 Page - International Rectifier

Part # IR3084A
Description  XPHASE TM VR 10/11 CONTROL IC
PDF  45 Pages
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Manufacturer  IRF [International Rectifier]
Direct Link  http://www.irf.com
Logo IRF - International Rectifier

IR3084A Datasheet(HTML) 36 Page - International Rectifier

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IR3084A
Page 36 of 45
10/30/2006
Select RFB = 324 ohms and then calculate the droop resistor,
ohms
VSETPT
D
C
VSETPT
RFB
RDRP
1
.
787
00494
.
0
015
.
0
0195
.
0
00494
.
0
324
=
−
+
⋅
=
−
+
⋅
=
Choose the next standard value higher than this with 1% tolerance or RDRP = 787ohms.
Soft Start Capacitor
CSS/DEL and Startup Times
Calculate the soft start capacitor from the required soft start time using Equation (9) with Boot Mode;
0.1uF
or
0988
.
0
787
324
324
1
*
1
.
1
10
*
1
.
1
*
10
*
70
1
2
*
10
*
70
3
6
6
/
uF
V
RDRP
RFB
RFB
VDAC
TD
C
DEL
SS
=
+
−
=
+
−
∗
=
−
−
−
The soft start delay time can be calculated using Equation (10) with Boot Mode;
+
+
=
+
∗
+
∗
=
−
−
787
324
324
*
1
.
1
3
.
1
*
10
*
70
10
*
1
.
0
6
6
V
V
RDRP
RFB
RFB
VDAC
1.3V
I
C
TD1
CHG
SS/DEL
ms
31
.
2
=
The VID sample time can be found using Equation (11);
mS
I
V
C
TD
CHG
DEL
SS
00
.
1
10
*
70
7
.
0
10
*
1
.
0
7
.
0
3
6
6
/
=
∗
=
∗
=
−
−
The power good delay time can be found using Equation (12);
ms
us
V
TD
I
V
C
TD
CHG
DEL
SS
998
.
0
73
10
*
70
75
.
0
*
10
*
1
.
0
4
75
.
0
*
5
6
6
/
=
−
=
−
=
−
−
Finally, use Equation (13) to calculate the over-current fault latch delay time;
us
mV
C
T
DEL
SS
OCDEL
250
10
*
40
10
*
100
*
10
*
1
.
0
10
*
40
100
*
6
3
6
6
/
=
=
=
−
−
−
−



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