LT3574 Просмотр технического описания (PDF) - Linear Technology
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LT3574 Datasheet PDF : 24 Pages
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LT3574
Applications Information
Transformer Design Considerations
Transformer specification and design is perhaps the most
critical part of successfully applying the LT3574. In addition
to the usual list of caveats dealing with high frequency
isolated power supply transformer design, the following
information should be carefully considered.
Linear Technology has worked with several leading mag-
netic component manufacturers to produce pre-designed
flyback transformers for use with the LT3574. Table 5 shows
the details of several of these transformers.
Table 5. Predesigned Transformers—Typical Specifications Unless Otherwise Noted
TRANSFORMER SIZE (W × L × H)
LPRI
LLEAKAGE
RPRI
PART NUMBER
mm
(µH)
(nH)
NP:NS:NB (mΩ)
PA3018NL
12.70 × 10.67 × 9.14
50
700
4:1:1
250
PA2626NL
12.70 × 10.67 × 9.14
30
403
3:1:1
240
PA2627NL
15.24 × 13.1 × 11.45
50
766
3:1:1
420
PA3019NL
12.70 × 10.67 × 9.14
50
700
3:1:1
250
PA3020NL
12.70 × 10.67 × 9.14
60
680
2:1:0.33
400
PA3021NL
12.70 × 10.67 × 9.14
50
195
1:1:0.33
100
750311304
15.24 × 13.3 × 11.43
50
825
4:1:1.5
146
750310564
15.24 × 13.3 × 11.43
63
450
3:1:1
115
750370040
9.14 × 9.78 × 10.54
30
150
3:1:1
60
750370041
9.14 × 9.78 × 10.54
50
450
3:1:1
190
750370047
13.35 × 10.8 × 9.14
30
150
3:1:1
60
750311307
15.24 × 13.3 × 11.43 100
2000
2:1:0.33
173
750311308
15.24 × 13.3 × 11.43 100
2090
1:1:0.33
325
L10-1022
9.52 × 9.52 × 4.95
30
-
1:1
0.142
RSEC
(mΩ)
32
66
44
72
200
200
17
50
12.5
26
12.5
104
480
0.142
VENDOR
Pulse Engineering
Pulse Engineering
Pulse Engineering
Pulse Engineering
Pulse Engineering
Pulse Engineering
Würth Elektronik
Würth Elektronik
Würth Elektronik
Würth Elektronik
Würth Elektronik
Würth Elektronik
Würth Elektronik
BH Electronics
TARGET
APPLICATIONS
3.3V, 0.7A
5V, 0.5A
5V, 0.5A
5V, 0.5A
12V, 0.25A
15V, 0.15A
3.3V, 0.7A
±5V, 0.5A
5V, 0.5A
5V, 0.5A
5V, 0.5A
12V, 0.25A
15V, 0.15A
5V, 0.1A
3574f
11
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