IR3084AMPBF International Rectifier, IR3084AMPBF Datasheet - Page 35

• Manufacturer Part Number: IR3084AMPBF
• Description: IC XPHASE CONTROL 28-MLPQ
• Manufacturer: International Rectifier
• Series: XPhase™r

Specifications of IR3084AMPBF

• Applications: Processor
• Current - Supply: 14mA
• Voltage - Supply: 9.5 V ~ 16 V
• Operating Temperature: 0°C ~ 100°C
• Mounting Type: Surface Mount
• Package / Case: 28-MLPQ
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Using the calculated value of C
voltage of 1.300V during startup with Boot Mode using Equation 4a;
No Load Output Voltage Setting Resistor RVSETPT, R
First, use Equations (19) and (20) to calculate the current sense resistors R
design, in the next section, R
Second, calculate the total input offset voltage (V
From the IR3086A data sheet, typical values for the I
and 0.40µA, respectively.
Next, derive the intermediate calculations (A,B,C,D) as shown below before finally calculating R
using Equations (7) and (8). From Figure 15 on page 23, the I
R
OSC
=30.1kΩ and a typical value for the offset voltage of the error amplifier is 0.0mV.
Choose the closest standard resistor value to this with 1% tolerance or RVESTPT = 124ohms.
Page 35 of 45
V
VSETPT
TD
C
B
D
RVSETPT
A
CS_TOFST





4
. 0
V
V
V
Io

O
CS_TOFST
3984
O
*
_
I
_
C
NLOFST
SOURCE
R
NLOFST



VDAC
L
n
V

. 0
*
(
*G
CS_OFST
A
G
A
VSETPT
55



CSA
I
*

CSA
VSETPT
mV
V
Io
D

B
VDAC
OS



*
CS+


V

V
_
Ro
C
C
VDAC

CS
EA

OS_EA
is determined to be 10KΩ and R
I
. 0
*


CSIN
_



25
, find the positive VID voltage rise time (TD4) to the specified nominal DAC
B
TOFST
D
40
. 0
V
15
1

)

OS
1 .
*
00494
x


10
*
V
0.574*10
10
_
*
10
R
EA
. 0

G
. 0

CS


6

3984
6
CSA

3984
3

*
33
90

 
10
15



123
nF
0
uA
CS_TOFST
K
*
V
0 .

*

I
10

3
OS
CSIN
mV
. 0
. 0
5 .
*34
*
CSIN+
 

_

015
1710
ohms

. 1
3
EA


300



) of the current sense amplifiers using Equation (6).
. 0

and I
130
FB

0.0mV
R
. 0
40
130

V
. 0
CS
015
and Adaptive Voltage Positioning Resistor R
. 0
*
*

VSETPT
0195
CSIN−

10

. 1
0195
*
1
CS−
20
1 .
. 0


6
V
bias currents are determined to be 0.25µA
60
*
is found to be 6.19KΩ.
*
bias current is determined to be 40µA at
0.0.0195
*


. 0
10
7
. 6

*
. 0
1710
19
10
73

015
3
K

CS+

3 .
3

0
*
us

and R
0 .

34

. 0
mV
. 0

00494
574
. 0
CS−

574
, respectively. For this
. 0
mV
V
1710
*
10
IR3084A
VSETPT

3/3/2009
3
*
34
and RDRP

0
0 .
mV
DRP