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參數(shù)資料
| 型號： | LT1766HGN#PBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 3 A SWITCHING REGULATOR, 228 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封裝： | 0.150 INCH, LEAD FREE, PLASTIC, SSOP-16 |
| 文件頁數(shù)： | 3/28頁 |
| 文件大?。?/td> | 284K |
| 代理商： | LT1766HGN#PBF |
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LT1766/LT1766-5
1766fb
or not the inductor must withstand continuous fault
conditions.
If maximum load current is 0.5A, for instance, a 0.5A
inductor may not survive a continuous 2A overload condi-
tion. Dead shorts will actually be more gentle on the
inductor because the LT1766 has frequency and current
limit foldback.
Peak switch and inductor current can be significantly
higher than output current, especially with smaller induc-
tors and lighter loads, so don’t omit this step. Powdered
iron cores are forgiving because they saturate softly,
whereas ferrite cores saturate abruptly. Other core
APPLICATIO S I FOR ATIO
WU
UU
where:
ESR = equivalent series resistance of the output
capacitor
ESL = equivalent series inductance of the output
capacitor
dI/dt = slew rate of inductor ripple current = VIN/L
Peak-to-peak ripple current (ILP-P) through the inductor
and into the output capacitor is typically chosen to be
between 20% and 40% of the maximum load current. It is
approximated by:
I
VV
V
Vf L
LP P
OUT
IN
OUT
IN
- =
()(
)
()( )( )
–
Example: with VIN = 40V, VOUT = 5V, L = 47H, ESR = 0.1
and ESL = 10nH, output ripple voltage can be approxi-
mated as follows:
IA
dI
dt
VA
mV
RIPPLE
P-P
=
()
()
()(
)
=
==
=
()( )+
()( )()
=+=
540 5
40 47 10
200 10
0 465
40
47 10
10
0 85
0 465
0 1
10 10
10
0 85
0 0465 0 0085
55
63
6
96
.
.
..
.
..
To reduce output ripple voltage further requires an in-
crease in the inductor value or a reduction in the capacitor
ESR. The latter can effect loop stability since the ESR
forms a useful zero in the overall loop response. Typically
the inductor value is adjusted with the trade-off being a
physically larger inductor with the possibility of increased
component height and cost. Choosing a smaller inductor
with lighter loads may result in discontinuous operation
but the LT1766 is designed to work well in both continu-
ous or discontinuous mode.
Peak Inductor Current and Fault Current
To ensure that the inductor will not saturate, the peak
inductor current should be calculated knowing the maxi-
mum load current. An appropriate inductor should then
be chosen. In addition, a decision should be made whether
Table 2
VENDOR/
VALUE
IDC
DCR
HEIGHT
PART NO.
(
H)
(Amps)
(Ohms)
(mm)
Coiltronics
CTX15-1P
15
1.4
0.087
4.2
CTX15-1
15
1.1
0.08
4.2
CTX33-2P
33
1.3
0.126
6
CTX33-2
33
1.4
0.106
6
UP2-330
33
2.4
0.099
5.9
UP2-470
47
1.9
0.146
5.9
UP2-680
68
1.7
0.19
5.9
UP2-101
100
1.4
0.277
5.9
Sumida
CDRH6D28-150M
15
1.4
0.076
3
CDRH6D38-150M
15
1.6
0.062
4
CDRH6D28-330M
33
0.97
0.122
3
CDRH104R-330M
33
2.1
0.069
3.8
CDRH125-330M
33
2.1
0.044
6
CDRH104R-470M
47
2.1
0.095
3.8
CDRH125-470M
47
1.8
0.058
6
CDRH6D38-680M
68
0.75
0.173
4
CDRH104R-680M
68
1.5
0.158
3.8
CDRH125-680M
68
1.5
0.093
6
CDRH104R-101M
100
1.35
0.225
3.8
CDRH125-101M
100
1.3
0.120
6
Coilcraft
DT3316P-153
15
1.8
0.06
5
DT3316P-333
33
1.3
0.09
5
DT3316P-473
47
1
0.11
5
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