ir3092 International Rectifier Corp., ir3092 Datasheet - Page 29

• Manufacturer Part Number: ir3092
• Description: 2 Phase Opteron, Athlon, Or Vr10.x Control Ic
• Manufacturer: International Rectifier Corp.

Compensation of Voltage Loop
Inductor Current Sensing Capacitor C
Set BIASOUT voltage Resistor Rset
Choose capacitor C
The bias currents of CSIN+ and CSIN- are 0.2uA and 0.4uA respectively. Calculate resistor R
Bias current I
MOSFETs.
AL-Polymer output capacitors are used in the design, and the crossover frequency of the voltage loop can
be estimated as,
R
the desired crossover frequency fc1 (=25kHz) and determine R
In practice, adjust R
Page 29 of 37
C
R
R
R
R
R
F
R
f
COMP
C
CS
CSO
SET
M
COMP
FB
DRP
COMP
2
V
S
V
L
V
and C
C
I
I
I
I
R
O
2 (
BIASOUT
SETBIAS
CSIN
CSIN
10
R
CS
I
_
FB
V
C
ROSC
S
NLOFST
V
L
O
E
SETBIAS
RAMP
2


COMP
R
R
f
(
COMP
. 0
L
C
L
G
R
R
1
E
45
O
)
CS
CS
95
V
CS
COMP
2
is around 95uA in this case. Set V
are used to fine tune the crossover frequency and transient load response. Choose
23
R
I
12
26
25
*
C
*
. 0
DRP
. 1
= 0.22uF calculate R
10
5 .
8
R
L
10
E
F
*
*
22
0
0
325
E
FB
2 .
4 .
M
10
10
. 0
and C


6
6
*
63
1
C
0 /
*
10


10
R
3
6
*
3
E
7 .
LE
10
k
84

COMP
:
6
2
*

. 0
R
3
.
961
10
21
1 *
(
1 *
FB
R
175
450
1
CE
k

3 .
if need to get desired dynamic load response performance.
*
CS
:
3
5 .
)
30
10
*
k
2 (
and Resistors R
10
:
10
S

2
2
3
CS
9 .
10

S
!
*
3
9
k
25
23
3
:
/
. 0
) 2
5 .
011
10
. 0
3
BIASOUT
9
)
011
Choose R
4 .
[
2
23
FB
k
CS
:
(
5 .
450
= 1k
12
and R
17
around 8V to be gate drive voltage of
COMP
* 1
nF
. 9
. 0
SET
Choose R
10
10
53
175
CSO
3
and C
=82.5k
Choose R
9
*
10
/
0 (
) 2
3
7 .
COMP
CS
*
. 0
10
=3k
011
DRP

.
3
/
) 2
= 9.53k
* 1

10
* 1
3
06/25/04
10
30
CSO

3
]
k
:
,
17
IR3092
kHz