lt3573 Linear Technology Corporation, lt3573 Datasheet - Page 11

• Manufacturer Part Number: lt3573
• Description: Isolated Flyback Converter Without An Opto-coupler
• Manufacturer: Linear Technology Corporation

APPLICATIONS INFORMATION
TRANSFORMER DESIGN CONSIDERATIONS
Transformer specifi cation and design is perhaps the most
critical part of successfully applying the LT3573. In addition
to the usual list of caveats dealing with high frequency
isolated power supply transformer design, the following
information should be carefully considered.
Table 5. Predesigned Transformers—Typical Specifi cations, Unless Otherwise Noted
TRANSFORMER
PART NUMBER
PA2364NL
PA2363NL
PA2362NL
PA2454NL
PA2455NL
PA2456NL
PA2617NL
PA2626NL
PA2627NL
GA3429-BL
GA3430-BL
GA3431-BL
750310471
750310559
750310562
750310563
750310564
750310799
750370040
750370041
750370047
L11-0059
L10-1019
15.24 13.1 11.45
15.24 13.1 11.45
15.24 13.1 11.45
15.24 13.1 11.45
15.24 13.1 11.45
15.24 13.1 11.45
12.70 10.67 9.14
12.70 10.67 9.14
15.24 13.1 11.45
15.24 12.7 11.43
15.24 12.7 11.43
15.24 12.7 11.43
15.24 13.3 11.43
15.24 13.3 11.43
15.24 13.3 11.43
15.24 13.3 11.43
15.24 13.3 11.43
9.14 9.78 10.54
9.14 9.78 10.54
9.14 9.78 10.54
13.35 10.8 9.14
9.52 9.52 4.95
9.52 9.52 4.95
SIZE (W L H)
(mm)
(μH)
L
25
25
24
24
25
25
21
30
50
25
25
25
25
24
25
25
63
25
30
50
30
24
18
PRI
L
LEAKAGE
1000
(nH)
850
550
430
450
390
245
403
766
566
685
945
350
400
330
325
450
125
150
450
150
N
1:1:0.33
1:1:0.33
1:1:0.5
P
7:1:1
5:1:1
4:1:1
3:1:1
2:1:1
1:1:1
3:1:1
3:1:1
4:1:1
5:1:1
7:1:1
3:1:1
4:1:1
2:1:1
3:1:1
3:1:1
3:1:1
3:1:1
:N
3:1
1:1
S
:N
B
Linear Technology has worked with several leading mag-
netic component manufacturers to produce pre-designed
fl yback transformers for use with the LT3573. Table 5 shows
the details of several of these transformers.
(mΩ)
R
125
117
117
164
240
420
115
190
266
82
82
82
95
90
90
57
51
60
60
60
60
60
90
PRI
(mΩ)
R
12.5
12.5
166
266
5.6
7.5
9.5
7.5
5.5
5.5
11
22
84
66
44
11
16
20
60
50
74
26
90
SEC
Pulse Engineering
Pulse Engineering
Pulse Engineering
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
Würth Elektronik
Würth Elektronik
BH Electronics
BH Electronics
VENDOR
Coilcraft
Coilcraft
Coilcraft
12V- >3.3V, 1.5A
24V- >3.3V, 1.5A
24V- >3.3V, 1.5A
12V- >3.3V, 1.5A
24V- >3.3V, 1.5A
24V- >12V, 0.5A
12V- >12V, 0.3A
24V- >12V, 0.4A
24V- >15V, 0.4A
24V- >12V, 0.5A
24V- >12V, 0.3A
24V- >12V, 0.4A
24V- >±5V, 0.5A
24V- >15V, 0.4A
APPLICATIONS
36V- >5V, 0.6A
36V- >5V, 0.6A
5V- >5V, 0.2A
12V- >5V, 1A
24V- >5V, 1A
24V- >5V, 1A
24V- >5V, 1A
12V- >5V, 1A
24V- >5V, 1A
24V- >5V, 1A
24V- >5V, 1A
24V- >5V, 1A
24V- >5V, 1A
LT3573
TARGET
11
3573f