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IR3086AM Datasheet(PDF) 28 Page - International Rectifier

Part # IR3086AM
Description  XPHASETM PHASE IC WITH OVP, FAULT AND OVERTEMP DETECT
PDF  33 Pages
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Manufacturer  IRF [International Rectifier]
Direct Link  http://www.irf.com
Logo IRF - International Rectifier

IR3086AM Datasheet(HTML) 28 Page - International Rectifier

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IR3086A
RPHASE41=10kΩ, RPHASE42=768Ω, RPHASE43=2.80kΩ
Bootstrap Capacitor CBST
Choose CBST=0.1uF
Decoupling Capacitors for Phase IC and Power Stage
Choose CVCC=0.1uF, CVCCL=0.1uF
VOLTAGE LOOP COMPENSATION
Type III compensation is used for the converter with only ceramic output capacitors. The crossover frequency and
phase margin of the voltage loop can be estimated as follows.
kHz
R
R
G
C
R
f
LE
FB
CS
E
DRP
C
146
)
6
/
10
*
5
.
0
(
162
34
)
10
*
22
62
(
2
576
2
3
6
1
=
∗
∗
∗
∗
∗
=
∗
∗
∗
∗
=
−
−
π
π
°
=
∗
−
=
63
180
)
5
.
0
tan(
90
1
π
θ
A
C
Choose
Ω
=
∗
=
∗
=
110
162
3
2
3
2
1
FB
FB
R
R
Choose the desired crossover frequency fc (=140kHz) around fc1 estimated above, and calculate
nF
R
f
C
FB
C
FB
2
.
5
110
10
*
140
4
1
4
1
3
1
=
∗
∗
=
∗
∗
=
π
π
, choose CFB=5.6nF
nF
R
C
R
R
C
DRP
FB
FB
FB
DRP
7
.
2
576
10
*
6
.
5
)
110
162
(
)
(
9
1
=
∗
+
=
∗
+
=
−
Ω
=
−
∗
∗
∗
∗
∗
=
∗
∗
∗
∗
∗
=
−
−
−
k
V
V
R
C
L
f
R
O
RAMP
FB
E
E
C
CP
65
.
1
10
*
20
3
.
1
75
.
0
*
162
)
62
10
*
22
(
)
6
/
10
*
100
(
)
10
*
140
2
(
)
2
(
3
6
9
2
3
2
π
π
nF
R
C
L
C
CP
E
E
CP
27
10
65
.
1
)
62
*
10
*
22
(
)
6
/
10
*
100
(
10
10
3
6
9
=
∗
∗
∗
=
∗
∗
=
−
−
Choose CCP1=47pF to reduce high frequency noise.
CURRENT SHARE LOOP COMPENSATION
The crossover frequency of the current share loop fCI should be at least one decade lower than that of the voltage
loop fC. Choose the crossover frequency of current share loop fCI=3.5kHz, and calculate CSCOMP,
011
.
0
)
3
.
1
12
(
*
)
3
.
1
75
.
0
12
(
75
.
0
*
10
*
800
*
10
*
100
*
10
*
2
.
18
)
(
*
)
(
*
*
*
3
12
3
=
−
−
−
=
−
−
−
=
−
DAC
I
DAC
PWMRMP
I
PWMRMP
SW
PWMRMP
PWMRMP
MI
V
V
V
V
V
V
f
C
R
F
6
_
10
*
05
.
1
*
2
*
)]
(
*
*
*
2
1
[
*
*
*
*
*
*
65
.
0
CI
O
MI
O
O
E
CI
LE
ROOM
CS
O
I
PWMRMP
SCOMP
f
V
F
I
V
C
f
R
G
I
V
R
C
∗
∗
+
=
π
π
6
4
4
6
3
3
10
*
05
.
1
*
3500
2
)
10
*
1
.
9
*
105
33
.
1
(
011
.
0
*
]
105
)
10
*
1
.
9
*
105
33
.
1
(
*
62
*
10
*
22
*
3500
*
2
1
[
*
)
6
10
*
5
.
0
(
*
34
*
105
*
12
*
10
*
2
.
18
*
65
.
0
∗
∗
−
−
+
=
−
−
−
−
π
π
nF
6
.
20
=
Choose CSCOMP=22nF
Page 28 of 33
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