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LT3748 Datasheet(PDF) 13 Page - Linear Technology

Part # LT3748
Description  100V Isolated Flyback Controller
PDF  30 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LT3748 Datasheet(HTML) 13 Page - Linear Technology

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APPLICATIONS INFORMATION
Table 1. Pre-Designed Transformers—Typical Specifications Unless Otherwise Noted
TRANSFORMER
PART NUMBER
Size (W x L x H) mm
LPRI
(μH)
LLEAK
(nH)
NPS
(NP:NS)
ISAT
(A)
RPRI
(mΩ)
RSEC
(mΩ)
MANUFACTURER
TARGET APPLICATION†
INPUT (V)
OUTPUT
750311424
17.7 × 14.0 × 12.7
100
844
3:1
3
180
29
Würth Electronics
40 to 75
12V/1A
750311456*
17.7 × 14.0 × 12.7
100
900
3:1
2.4
225
31
Würth Electronics
40 to 75
12V/1A
750311439
17.7 × 14.0 × 12.7
37
750
2:1
2.8
89
28
Würth Electronics
30 to 75
12V/1A
750311423
17.7 × 14.0 × 12.7
50
570
4:1
4
90
12
Würth Electronics
30 to 75
5V/3A
750311457
17.7 × 14.0 × 12.7
50
600
4:1
3.7
115
12
Würth Electronics
30 to 75
5V/3A
750311689
17.7 × 14.0 × 12.7
50
600
4:1
3.7
115
12
Würth Electronics
30 to 75
5V/3A
750311458*
17.7 × 14.0 × 12.7
15
175
3:1
5
35
6
Würth Electronics
10 to 40
5V/2.5A
750311564
17.7 × 14.0 × 12.7
9
120
3:1
8
36
7
Würth Electronics
10 to 40
5V/3A
750311624
17.7 × 14.0 × 12.7
9
150
1.5:1
8
34
21
Würth Electronics
10 to 40
15V/1A
750311604
29.08 × 23.11 × 11.43
8
300
1:1
9.5
30
12
Würth Electronics
10 to 40
24V/1.3A
750311599
29.08 × 23.11 × 11.43
8
500
1.5:1
12
30
12
Würth Electronics
10 to 40
15V/2A
750311600
29.08 × 23.11 × 11.43
12
500
3:1
11
30
40
Würth Electronics
20 to 75
15V/2A
750311608
29.08 × 23.11 × 11.43
12
500
1.5:1
9
30
20
Würth Electronics
20 to 75
24V/1.3A
750311607
29.08 × 23.11 × 11.43
14
500
2.5:1
9.5
40
10
Würth Electronics
20 to 75
12V/2.5A
750311590
32.31 × 27.03 × 13.69
8
200
2:1
18
15
8
Würth Electronics
10 to 40
12V/3.8A
750311591
32.31 × 27.03 × 13.69
8
200
1.5:1
20
15
12
Würth Electronics
10 to 40
15V/3A
750311592
32.31 × 27.03 × 13.69
8
200
1:1
18
15
20
Würth Electronics
10 to 40
24V/1.9A
750311594
32.31 × 27.03 × 13.69
15
400
2.33:1
18
35
15
Würth Electronics
20 to 75
12V/3.8A
750311595
32.31 × 27.03 × 13.69
12
200
3:1
18
15
12
Würth Electronics
20 to 70
15V/3A
750311596
32.31 × 27.03 × 13.69
12
200
1.5:1
16
30
30
Würth Electronics
20 to 70
24V/1.9A
PA2367NL
17.7 × 14.0 × 12.7
85
750
2.7:1
1.7
325
26
Pulse Engineering
20 to 75
12V/1A
PA1276NL
17.7 × 14.0 × 12.7
77.4
800
1.47:1
1.6
100
75
Pulse Engineering
20 to 75
12V/1A
PA2467NL
17.7 × 14.0 × 12.7
37
750
2:1
2.9
89
28
Pulse Engineering
20 to 75
12V/1A
PA1260NL
17.7 × 14.0 × 12.7
77.4
800
3.67:1
1.5
220
18
Pulse Engineering
20 to 75
5V/2A
PA3177NL
29.21 × 21.84 × 11.43
8.3
100
2:1
8.6
10
7
Pulse Engineering
10 to 40
10V/2.5A
*2.5k isolation, others are rated for 1.5kV isolation.
†TARGET APPLICATION, NOT GUARANTEED.
Turns Ratio and RMS Diode Current
Note that when using an RFB/RREF resistor ratio to set
output voltage, the user has relative freedom in selecting
a transformer turns ratio to suit a given application. In
contrast, simpler ratios of small integers (e.g., 1:1, 2:1,
3:2, etc.) can be employed to provide more freedom in
setting total turns and mutual inductance.
While the turns ratio can be selected to maximize output
power for a given current limit, minimizing the turns
ratio and increasing the current limit will often increase
efficiency and better utilize the saturation current of a
given transformer. Figure 3 shows the maximum output
power using three transformers with different windings
ratios that have the same output inductance and peak
output current, illustrating that increasing current while
decreasing turns ratio can deliver more power.
There are two significant constraints on the turns ratio.
First, as described in the previous section on limitations
to output power, the drain of the MOSFET switch will
see a voltage equal to the maximum input supply plus



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