ir3086a International Rectifier Corp., ir3086a Datasheet - Page 23

• Manufacturer Part Number: ir3086a
• Description: Xphasetm Phase Ic With Ovp, Fault And Overtemp Detect
• Manufacturer: International Rectifier Corp.

Body Braking
N/A. The body braking during Dynamic VID is disabled.
IR3081A EXTERNAL COMPONENTS
PWM Ramp Resistor R
Set PWM ramp magnitude V
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
Over Temperature Setting Resistors R
Use central over-temperature setting and set the temperature threshold at 115 ºC, which corresponds to the IC die
temperature of 116 ºC. Calculate the HOTSET threshold voltage corresponding to the temperature thresholds.
Pre-select R
Phase Delay Timing Resistors R
Use central over-temperature setting and set the temperature threshold at 115 ºC, which corresponds to the IC die
temperature of 116 ºC. Calculate the HOTSET threshold voltage corresponding to the temperature thresholds.
The phase delay resistor ratios for phases 1 to 6 at 400kHz of switching frequencies are RA
RA
slope. Pre-select R
R
V
R
R
R
R
R
CS
CS
HOTSET
PHASE22
PWMRMP
PHASE
HOTSET
12
PHASE2


400
12
. 0
L
C
0
2
Page 23 of 33
CS
4 .
25
PWMRMP
*
R
=7.15k , R
CS+
=0.415, RA
. 4
10
1
L

V
R
73

RA
IN
HOTSET1
V
3
R
HOTSET
=47nF, and calculate R
RA
CS
*
BIAS
TM
PHASE
220
10
220
PHASE
f

SW
Related Resistors R
,

*

3
1
PHASE11
*
10
1
V
. 0
*
10
0
=10.0kŸ,
1
PHASE32
C
47
HOTSET
T
V
PHASE3

25
4 .
9
J
PWMRMP

HOTSET
12
*
R
/(
PWMRMP

10
PHASE
. 0
10
. 1
=R
[ln(
47

. 1
241
0 .
9
=0.202, RA
PWMRMP
33
=2.55k , R
*
*
11
PHASE21
12
10
10
[ln(
10

and Capacitor C

3
. 4
6
1
3
. 1
*
V
PHASE1
)
73
8 .

10
. 0
IN
35
6
CS+,
. 0

628
*
=0.8V. Choose 220pF for PWM ramp capacitor C
2 .
3

)
10
=R
. 1
628
BBFB
10

k
V
V
79
PHASE4
CS+
0 .
:
. 1
PHASE42
ln(
HOTSET1
O
DAC

PHASE31
3
79
k
and R
, choose R
12
:
10
and R
)
and Resistors R
116


*
. 3
ln(
. 1
10
=0.246, RA

57
PHASE2
35
=3.24k , P
V
=R
3
and R
. 1
BBDRP
PWMRMP
IN
k

241
:
PHASE41
16
0

CS-
8 .
V
9 .
)]
DAC
HOTSET2
k
=6.19kŸ
. 1
:
79
PHASE5
16

PHASE52
=R
V
V
.
CS+
k 1
PWMRMP
PHASE51
:
=0.441 and RA
and R
, choose R
=7.87k , R
)]
= R
CS-
PHASE61
PWMRMP
PHASE62
PHASE6
=10kŸ,
=16.2kŸ
=17.4k
PWMRMP
=0.637 starting from down-
IR3086A
CS-
, and calculate the
,
1/31
PHASE1
/05
=0.628,