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IR3084MPBF Datasheet(PDF) 35 Page - International Rectifier

Part # IR3084MPBF
Description  XPHASETM 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

IR3084MPBF Datasheet(HTML) 35 Page - International Rectifier

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IR3084
Page 35 of 45
07/20/2005
Using the calculated value of CVDAC, find the positive VID voltage rise time (TD4) to the specified nominal DAC
voltage of 1.300V during startup with Boot Mode using Equation 4a;
(
)
(
)
us
V
V
uA
nF
V
VDAC
I
C
TD
SOURCE
VDAC
3
.
73
1
.
1
300
.
1
*
90
33
1
.
1
4
=
−
=
−
∗
=
No Load Output Voltage Setting Resistor RVSETPT, RFB and Adaptive Voltage Positioning Resistor RDRP
First, use Equations (19) and (20) to calculate the current sense resistors RCS+ and RCS−, respectively. For this
design, in the next section, RCS+ is determined to be 10K
and RCS− is found to be 6.19K .
Second, calculate the total input offset voltage (VCS_TOFST) of the current sense amplifiers using Equation (6).
From the IR3086A data sheet, typical values for the ICSIN+ and ICSIN− bias currents are determined to be 0.25µA
and 0.40µA, respectively.
(
) (
)
−
−
+
+
∗
−
∗
+
=
CS
CSIN
CS
CSIN
CS_OFST
CS_TOFST
R
I
R
I
V
V
(
) (
)
mV
K
K
mV
574
.
0
19
.
6
*
10
*
40
.
0
10
*
10
*
25
.
0
55
.
0
6
6
=
Ω
−
Ω
+
=
−
−
Next, derive the intermediate calculations (A,B,C,D) as shown below before finally calculating RVSETPT and RDRP
using Equations (7) and (8). From Figure 15 on page 6, the IVSETPT bias current is determined to be 40µA at
ROSC=30.1k
and a typical value for the offset voltage of the error amplifier is 0.0mV.
mV
V
G
V
n
G
R
Io
A
EA
OS
CSA
TOFST
CS
CSA
L
0
.
0
34
*
10
*
574
.
0
7
34
*
10
*
60
.
0
*
130
*
*
*
3
3
_
_
+
+
=
+
+
=
−
−
3984
.
0
=
1710
.
0
0
.
0
10
*
20
.
1
*
130
10
*
15
*
3
3
_
_
=
−
+
=
−
+
=
−
−
mV
V
Ro
Io
V
B
EA
OS
NLOFST
O
0.0.0195
0.0mV
*34
0.574*10
V
*G
V
C
3
OS_EA
CSA
CS_TOFST
=
+
=
+
=
−
015
.
0
0
.
0
10
*
15
3
_
_
=
−
=
−
=
−
mV
V
V
D
EA
OS
NLOFST
O
V
D
C
B
A
B
C
D
A
VSETPT
00494
.
0
015
.
0
0195
.
0
1710
.
0
3984
.
0
1710
.
0
*
0195
.
0
015
.
0
*
3984
.
0
)
(
*
*
=
−
−
+
−
=
−
−
+
−
=
ohms
x
I
VSETPT
RVSETPT
VSETPT
5
.
123
10
40
00494
.
0
6 =
=
=
−
Choose the closest standard resistor value to this with 1% tolerance or RVESTPT = 124ohms.



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