IR3084AMPBF International Rectifier, IR3084AMPBF Datasheet - Page 38

• 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

IR3086 PHASE IC COMPONENTS
PWM Ramp Resistor R
Set the PWM ramp magnitude V
calculate the resistor R
Inductor Current Sensing Capacitor C
Choose C
The bias currents of CSIN+ and CSIN− are 0.25uA and 0.4uA respectively. Calculate resistor R
Equation (20);
Over Temperature Setting Resistors R
Use central over temperature setting and set the temperature threshold at 115 ºC, which corresponds the IC die
temperature of 116 ºC. Calculate the HOTSET threshold voltage corresponding to the temperature thresholds
using Equations (21) and (22);
Page 38 of 45
V
R
R
R
R
CS+
HOTSET
CS
PWMRMP
HOTSET
CS


=47nF and calculate R


2
. 0
L

0
C

Choose a standard resistor value, R


25
4 .
. 4
CS
R
V
R
12
73


L
V
IN
HOTSET
PWMRMP
R
BIAS
*


RAMP

CS
10
400*10
220
f


SW

1
3


V
and Capacitor C
*
*

V
HOTSET
. 0
using Equation (18);
T
0
10
C
HOTSET
25
4 .
J
PWMRMP
3
47
PWMRMP



9
CS+

. 1
/(0.47
*
220*10
10
10
241

CS+
using Equation (19);
0 .
HOTSET1


20
9
*
to 0.8V. Choose 220pF for the PWM ramp capacitor C

[ln(V
*
10
and Resistors R
6
*
10
. 4

8 .
12
10
3
RAMP
73




3
3
and R
IN
. 1
)
*
[ln(12
6

10

79
1.30
2 .

. 1
V
PWMRMP
10.0kΩ
V
k

79
3

O
DAC
HOTSET2

,


116
)
1.30)
. 7

CS+
14
=15.8kΩ.

ln(V
. 1
choose R
k
and R


241
IN
ln(12


CS−
V
. 1
DAC

CS−
79
1.30
V

= 6.19kΩ
, choose R
V

PWMRMP
0.8)]
)]

HOTSET1
15.8kΩ
IR3084A
3/3/2009
=20.0kΩ,
PWMRMP
,
CS−
using
and