Datasheet

LT3574
11
3574f
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.
applications inForMation
Table 5. Predesigned Transformers—Typical Specifications Unless Otherwise Noted
TRANSFORMER
PART NUMBER
SIZE (W × L × H)
mm
L
PRI
(µH)
L
LEAKAGE
(nH) NP:NS:NB
R
PRI
(mΩ)
R
SEC
(mΩ) VENDOR
TARGET
APPLICATIONS
PA3018NL
12.70 × 10.67 × 9.14
50 700 4:1:1 250 32 Pulse Engineering 3.3V, 0.7A
PA2626NL
12.70 × 10.67 × 9.14
30 403 3:1:1 240 66 Pulse Engineering 5V, 0.5A
PA2627NL
15.24 × 13.1 × 11.45
50 766 3:1:1 420 44 Pulse Engineering 5V, 0.5A
PA3019NL
12.70 × 10.67 × 9.14
50 700 3:1:1 250 72 Pulse Engineering 5V, 0.5A
PA3020NL
12.70 × 10.67 × 9.14
60 680 2:1:0.33 400 200 Pulse Engineering 12V, 0.25A
PA3021NL
12.70 × 10.67 × 9.14
50 195 1:1:0.33 100 200 Pulse Engineering 15V, 0.15A
750311304 15.24 × 13.3 × 11.43 50 825 4:1:1.5 146 17 Würth Elektronik 3.3V, 0.7A
750310564 15.24 × 13.3 × 11.43 63 450 3:1:1 115 50 Würth Elektronik ±5V, 0.5A
750370040
9.14 × 9.78 × 10.54
30 150 3:1:1 60 12.5 Würth Elektronik 5V, 0.5A
750370041
9.14 × 9.78 × 10.54
50 450 3:1:1 190 26 Würth Elektronik 5V, 0.5A
750370047
13.35 × 10.8 × 9.14
30 150 3:1:1 60 12.5 Würth Elektronik 5V, 0.5A
750311307
15.24 × 13.3 × 11.43
100 2000 2:1:0.33 173 104 Würth Elektronik 12V, 0.25A
750311308
15.24 × 13.3 × 11.43
100 2090 1:1:0.33 325 480 Würth Elektronik 15V, 0.15A
L10-1022
9.52 × 9.52 × 4.95
30 - 1:1 0.142 0.142 BH Electronics 5V, 0.1A