參數(shù)資料
型號(hào): IR3088MTR
廠商: International Rectifier
英文描述: XPHASE PHASE IC WITH FAULT AND OVERTEMP DETECT
中文描述: XPHASE相集成電路及超溫故障檢測(cè)
文件頁(yè)數(shù): 28/34頁(yè)
文件大?。?/td> 688K
代理商: IR3088MTR
IR3088
The over temperature setting voltage of Phases 3 and 4 is higher than the phase delay setting voltage,
VBIAS*RA
PHASEx.
Pre-select
R
PHASEX1
=10k
,
=
32
HOTSET
BIAS
V
V
=
V
V
HOTSET
BIAS
79
.
8
R
PHASE41
=10k
, R
PHASE42
=768
, R
PHASE43
=2.80k
Bootstrap Capacitor
C
BST
Choose C
BST
=0.1uF
Decoupling Capacitors for Phase IC and Power Stage
Choose C
VCC
=0.1uF, C
VCCL
=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.
R
f
LE
FB
CS
E
34
)
10
*
22
62
(
2
2
π
π
180
)
tan(
90
1
π
2
3
Choose the desired crossover frequency fc (=140kHz) around fc1 estimated above, and calculate
1
4
1
π
π
=
=
887
79
.
8
10
*
10
)
198
.
79
.
)
(
3
31
3
PHASE
BIAS
PHASE
HOTSET
PHASE
R
V
RA
V
R
=
=
k
R
V
RA
R
PHASE
BIAS
PHASE
PHASE
67
.
10
*
10
8
198
.
*
3
31
3
33
kHz
R
R
G
C
DRP
C
146
)
/
10
*
5
162
576
3
6
1
=
=
=
°
=
=
63
θ
A
C
Choose
=
=
=
110
162
3
2
1
FB
FB
R
R
nF
R
f
C
FB
C
FB
2
110
10
*
140
4
1
3
=
=
=
, choose C
FB
=5.6nF
nF
R
C
R
R
C
DRP
FB
FB
FB
DRP
7
576
10
*
6
)
110
162
(
)
(
9
1
=
+
=
+
=
=
10
=
V
=
k
V
R
C
L
f
R
O
RAMP
FB
E
E
C
CP
65
.
*
20
3
75
.
*
162
)
62
10
*
22
3
(
)
/
10
*
100
(
)
10
*
140
2
)
2
6
9
2
3
2
π
π
nF
R
C
L
C
CP
E
E
CP
27
10
65
.
)
62
*
10
*
22
3
(
)
/
10
*
100
(
10
10
6
9
=
=
=
Choose C
CP1
=47pF to reduce high frequency noise.
CURRENT SHARE LOOP COMPENSATION
The crossover frequency of the current share loop f
CI
should be at least one decade lower than that of the voltage
loop f
C
. Choose the crossover frequency of current share loop f
CI
=3.5kHz
,
and calculate C
SCOMP
,
Page 28 of
34
9/30
/04
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