LT8301MP 查看數據表（PDF） - Analog Devices
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LT8301MP Datasheet PDF : 24 Pages
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LT8301
APPLICATIONS INFORMATION
In general, choose a transformer with its primary mag-
netizing inductance about 30% larger than the minimum
values calculated above. A transformer with much larger
inductance will have a bigger physical size and may cause
instability at light load.
Selecting a Transformer
Transformer specification and design is perhaps the most
critical part of successfully applying the LT8301. In addi-
tion to the usual list of guidelines dealing with high fre-
quency isolated power supply transformer design, the
following information should be carefully considered.
Analog Devices has worked with several leading magnetic
component manufacturers to produce pre-designed fly-
back transformers for use with the LT8301. Table 1 shows
the details of these transformers.
Turns Ratio
Note that when choosing the RFB resistor to set output
voltage, the user has relative freedom in selecting a trans-
former turns ratio to suit a given application. In contrast,
the use of simple ratios of small integers, e.g., 3:1, 2:1,
1:1, provides more freedom in settling total turns and
mutual inductance.
Table 1. Predesigned Transformers—Typical Specifications
TRANSFORMER
DIMENSIONS
PART NUMBER (W × L × H) (mm)
LPRI
LLKG
(µH) (µH) NP:NS
750313973
15.24 × 13.34 × 11.43 40
1
4:1
750370047
13.35 × 10.8 × 9.14
30
1
3:1:1
750313974
15.24 × 13.34 × 11.43 40
1
3:1
750313970
15.24 × 13.34 × 11.43 40
1
2:1
750310799
9.14 × 9.78 × 10.54
25 0.125 1:1:0.33
750313972
15.24 × 13.34 × 11.43 40
1
1:1
750313975
15.24 × 13.34 × 11.43 40
1
1:2
750313976
15.24 × 13.34 × 11.43 40
1
1:4
12387-T036
15.5 × 12.5 × 11.5
40
2
4:1
12387-T037
15.5 × 12.5 × 11.5
40
2
3:1
12387-T040
15.5 × 12.5 × 11.5
40
1.5
2:1
12387-T041
15.5 × 12.5 × 11.5
40
1.5
1:1
12387-T038
15.5 × 12.5 × 11.5
40
2
1:2
12387-T039
15.5 × 12.5 × 11.5
40
2
1:4
PA3948.003NL 15.24 × 13.08 × 11.45 40 1.45
4:1
PA3948.004NL 15.24 × 13.08 × 11.45 40 1.95
3:1
PA3948.001NL 15.24 × 13.08 × 11.45 40 1.45
2:1
PA3948.002NL 15.24 × 13.08 × 11.45 40 1.45
1:1
PA3948.005NL 15.24 × 13.08 × 11.45 40 1.60
1:2
PA3948.006NL 15.24 × 13.08 × 11.45 40 1.65
1:4
RPRI
(mΩ)
80
60
80
80
60
80
110
110
160
210
210
210
220
220
210
220
410
405
220
220
RSEC
(mΩ)
40
12.5
50
70
74
185
865
2300
25
30
50
200
460
2200
26
29
70
235
1275
3350
VENDOR
Würth Electronik
Würth Electronik
Würth Electronik
Würth Electronik
Würth Electronik
Würth Electronik
Würth Electronik
Würth Electronik
Sumida
Sumida
Sumida
Sumida
Sumida
Sumida
Pulse Engineering
Pulse Engineering
Pulse Engineering
Pulse Engineering
Pulse Engineering
Pulse Engineering
TARGET APPLICATIONS
VIN (V) VOUT (V) IOUT (A)
8 to 36
3.3
0.80
8 to 32
5
0.55
8 to 36
5
0.55
18 to 42 3.3
0.75
8 to 30
12
0.22
18 to 42
5
0.42
8 to 36
24
0.12
8 to 32
48
0.05
8 to 36
3.3
0.80
8 to 36
5
0.55
18 to 42 3.3
0.75
18 to 42
5
0.42
8 to 36
24
0.12
8 to 32
48
0.05
8 to 36
3.3
0.80
8 to 36
5
0.55
18 to 42 3.3
0.75
18 to 42
5
0.42
8 to 36
24
0.12
8 to 32
48
0.05
For more information www.analog.com
Rev. B
11
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