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LT1725IGN データシート(PDF) 24 Page - Linear Technology

部品番号 LT1725IGN
部品情報  General Purpose Isolated Flyback Controller
PDF  28 Pages
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メーカー  LINER [Linear Technology]
ホームページ  http://www.linear.com
Logo LINER - Linear Technology

LT1725IGN データシート(HTML) 24 Page - Linear Technology

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24
LT1725
1725f
TYPICAL APPLICATIO S
TELECOM 48V TO ISOLATED 5V APPLICATION
The design in Figure 10 accepts an input voltage in the
range of 36V to 72V and outputs an isolated 5V at up to 2A.
Transformer T1 is available as a Coiltronics CTX02-14989.
Capacitor C7 sets the switching frequency at approxi-
mately 275kHz. Optimal load compensation for the trans-
former and secondary circuit components is set by resistor
R8. Output voltage regulation and overall efficiency are
shown in the accompanying graphs. Efficiency is shown
both with and without the R11 preload. The resistor divider
formed by R13 and R14 sets the undervoltage lockout
threshold at about 32V, with a hysteresis band of about 2V.
The soft-start and 3VOUT features are unused as shown.
R2
0.18
Ω
M1
IRF620
T1
CTX02-14989
VOUT
5V
1725 F10a
R7
51k
R6
51k
C7
47pF
63
14
10
9
8
7
13
12
4
5
15
11
1
2
16
C6
1nF
R8
2.7k
R12
68
Ω
R1
47k
VIN
R10
22
Ω
R13
820k
R14
33k
R5
51k
R4
3.01k
1%
R3
35.7k
1%
C8
0.1
µF
+
C3
150
µF
D1
12CWQ06
R9
18
Ω
C5
470pF
D2
BAS16
+
C4
150pF
C2
1.5
µF
C1
15
µF
4
2
11
9
12
10
1
6
R11
51
Ω
1W
C9
100pF
C10
1
µF
PGND
ISENSE
GATE
VC
FB
VCC
UVLO
3VOUT
SGND
RCMPC
ROCMP
MENAB
LT1725
ENDLY
SFST
OSCAP
tON
Figure 10. 48V to Isolated 5V Converter
ILOAD (A)
0
5.00
1725 F10b
4.75
0.5
1.0
1.5
2.0
5.25
VIN = 36V
VIN = 72V
VIN = 48V
ILOAD (A)
0.01
60
70
80
90
0.1
1
10
1725 F10c
50
40
30
20
VIN = 48V
WITHOUT R11
PRELOAD
WITH R11
PRELOAD
Application Regulation
Application Efficiency



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