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IR3087MPBF Datasheet(PDF) 29 Page - International Rectifier

Part # IR3087MPBF
Description  XPHASETM PHASE IC WITH OPTI-PHASETM, OVP, AND OVERTEMP DETECT
PDF  35 Pages
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Manufacturer  IRF [International Rectifier]
Direct Link  http://www.irf.com
Logo IRF - International Rectifier

IR3087MPBF Datasheet(HTML) 29 Page - International Rectifier

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IR3087PBF
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
Opti-Phase Resistors ROP1 and ROP2
Disable Opti-phase function for phase 1 to keep it running at any load condition. Set the Opti-Phase shedding
current threshold for phases 2 to 5 at 20 A. Pre-select ROP21 = 10.0 kΩ, and calculate ROP22.
Ω
=
+
−
+
=
∗
+
∗
−
+
∗
∗
=
−
−
−
−
464
34
*
]
10
*
55
.
0
10
*
5
.
0
*
)
6
/
20
[(
8
.
6
34
*
]
10
*
55
.
0
10
*
5
.
0
*
)
6
/
20
[(
*
10
*
20
]
)
/
[(
*
]
)
/
[(
3
3
3
3
3
_
_
_
_
21
22
CS
TOFST
CS
L
OP
O
BIAS
CS
TOFST
CS
L
OP
O
OP
OP
G
V
R
n
I
V
G
V
R
n
I
R
R
ROP31 = ROP41 = ROP51 = ROP61 = 10.0 kΩ
ROP32 = ROP42 = ROP52 = ROP62 = 464 Ω
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.
Page 29 of 35
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