ir3088a International Rectifier Corp., ir3088a Datasheet - Page 23

• Manufacturer Part Number: ir3088a
• Description: Xphase Ic With Fault And Overtemp Detect
• Manufacturer: International Rectifier Corp.

Body Braking Related Resistors R
N/A. The body braking during Dynamic VID is disabled.
IR3088A 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
+
−
Page 23 of 33
∗
=
=
400
12
R
L
C
2
CS
=
CS
=
=
PWMRMP
*
R
=
=7.15kΩ, R
CS+
=0.415, RA
. 4
+
10
1
L
+
V
R
73
−
=
RA
IN
HOTSET1
=
V
3
HOTSET
=47nF, and calculate R
RA
10
∗
*
BIAS
∗
PHASE
220
10
220
0 .
PHASE
f
SW
k
,
−
*
−
Ω
3
1
PHASE11
*
10
1
V
∗
*
∗
10
=10.0kΩ,
1
PHASE32
C
47
HOTSET
T
V
PHASE3
−
∗
9
J
PWMRMP
−
HOTSET
12
*
R
/(
PWMRMP
+
10
PHASE
. 0
∗
. 1
=R
[ln(
47
−
. 1
241
9
=0.202, RA
PWMRMP
33
=2.55kΩ, R
*
11
=
PHASE21
∗
12
10
[ln(
=
10
=
−
and Capacitor C
−
. 4
6
1
3
. 1
*
V
PHASE1
)
73
8 .
−
10
. 0
IN
35
BBFB
=
CS+,
. 0
−
628
*
=0.8V. Choose 220pF for PWM ramp capacitor C
3
−
)
10
=R
. 1
628
10
−
∗
V
V
79
PHASE4
CS+
0 .
. 1
PHASE42
ln(
HOTSET1
O
DAC
−
PHASE31
3
79
and R
k
and R
∗
12
Ω
∗
10
)
and Resistors R
116
=
−
−
*
. 3
ln(
. 1
10
=0.246, RA
BBDRP
+
57
PHASE2
35
=3.24kΩ, P
V
=R
3
and R
. 1
PWMRMP
IN
k
=
−
241
Ω
PHASE41
16
0
−
8 .
V
9 .
=
)]
DAC
HOTSET2
k
. 1
Ω
=
79
PHASE5
16
−
PHASE52
=R
V
V
.
CS+
k 1
PWMRMP
PHASE51
Ω
=0.441 and RA
and R
, choose R
=7.87kΩ, R
)]
= R
CS-
PHASE61
PWMRMP
PHASE62
PHASE6
=10kΩ,
=16.2kΩ
=17.4kΩ
PWMRMP
=0.637 starting from down-
CS-
IR3088A
, and calculate the
,
1/15
PHASE1
/05
=0.628,