參數(shù)資料
型號： 1725I
廠商： Linear Technology Corporation
英文描述： General Purpose Isolated Flyback Controller
中文描述： 通用隔離反激式控制器
文件頁數(shù)： 22/28頁
文件大小： 241K
代理商： 1725I
22
LT1725
1725f
TYPICAL APPLICATIO S
TELECOM 48V TO ISOLATED 15V APPLICATION
The design in Figure 9 accepts an input voltage in the
range of 36V to 72V and outputs an isolated 15V at up to
2A. Transformer T1 is an off-the-shelf VERSA-PAK
TM
#VP5-0155, produced by Coiltronics. As manufactured, it
consists of six ideally identical independent windings. In
this application, three windings are stacked in series on
the primary side and two are placed in parallel on the
secondary side. This arrangement provides a 3:1 primary-
to-secondary turns ratio while maximizing overall effi-
ciency. The remaining winding provides a primary-side
Figure 9. 48V to Isolated 15V Converter
R2
0.1
M1
IRF620
T1
VP5-0155
R12
5.1
V
15V
1725 F09a
R7
51k
R6
51k
C7
47pF
6
3
14
R5
51k
10
9
8
7
13
12
4
5
15
11
1
2
16
C6
1nF
R8
6.2k
R11
150
D3
1N5257
D4
1N5257
D2
MBRS1100
R10
18
V
IN
R1
24k
C1
22
μ
F
R14
820k
R15
33k
R9
51
R4
3.01k
1%
R3
34.0k
1%
C8
0.1
μ
F
+
C4
150
μ
F
D1
MBRD660
D5
BAS16
+
C9
470pF
C3
100pF
C2
1.5
μ
F
×
3
8
5
9
4
1
12
2
11
10
3
6
7
C5
1
μ
F
R13
750
1W
C10
100pF
PGND
I
SENSE
GATE
V
C
OSCAP
FB
V
CC
UVLO
3V
OUT
SGND
R
CMPC
R
OCMP
MENAB
LT1725
ENDLY
SFST
t
ON
VERSA-PAK is a trademark of Coiltronics, Inc
ground-referred version of the flyback voltage waveform
for both feedback information and providing power to the
LT1725 itself.
Capacitor C7 sets the switching frequency at approxi-
mately 200kHz. 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. The resistor divider
formed by R14 and R15 sets the undervoltage lockout
threshold at about 32V, with a hysteresis band of about 2V.
The soft-start and 3V
OUT
features are unused as shown.
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