參數(shù)資料
型號(hào)： 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)： 2/28頁
文件大?。?/td> 241K
代理商： 1725I
2
LT1725
1725f
(Note 1)
V
CC
Supply Voltage................................................. 22V
UVLO Pin Voltage .................................................... V
CC
I
SENSE
Pin Voltage .................................................... 2V
FB Pin Current .....................................................
±
2mA
Operating Junction
Temperature Range
LT1725C.............................................. 0
°
C to 100
°
C
LT1725I...........................................–40
°
C TO 125
°
C
Storage Temperature Range................ –65
°
C to 150
°
C
Lead Temperature (Soldering, 10 sec)................ 300
°
C
ORDER PART
NUMBER
LT1725CGN
LT1725CS
LT1725IGN
LT1725IS
T
JMAX
= 125
°
C,
θ
JA
= 110
°
C/W (GN)
T
JMAX
= 125
°
C,
θ
JA
= 100
°
C/W (SO)
PACKAGE/ORDER U
U
W
ABSOLUTEW
W
W
U
TOP VIEW
S PACKAGE
16-LEAD PLASTIC SO
GN PACKAGE
16-LEAD PLASTIC SSOP
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
PGND
I
SENSE
SFST
R
OCMP
R
CMPC
OSCAP
V
C
FB
GATE
V
CC
t
ON
ENDLY
MINENAB
SGND
UVLO
3V
OUT
The
G
denotes specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25
°
C. V
CC
= 14V, GATE open, V
C
= 1.4V unless otherwise noted.
SYMBOL
PARAMETER
CONDITIONS
Power Supply
V
CC
V
CC
Turn-On Voltage
V
CC
Turn-Off Voltage
V
CC
Hysteresis (Note 3)
(V
TURN-ON
– V
TURN-OFF
)
I
CC
Supply Current
V
C
= Open
Start-Up Current
Feedback Amplifier
V
FB
Feedback Voltage
ELECTRICAL CHARACTERISTICS
Consult LTC Marketing for parts specified with wider operating temperature ranges.
GN PART
MARKING
1725
1725I
MIN
TYP
MAX
UNITS
G
G
G
14.0
8
4.0
6
15.1
9.7
5.4
10
120
16.0
11
6.5
15
280
V
V
V
G
G
mA
μ
A
1.230
1.220
1.245
1.260
1.270
V
V
G
I
FB
g
m
I
SRC
, I
SNK
V
CL
Feedback Pin Input Current
Feedback Amplifier Transconductance
Feedback Amplifier Source or Sink Current
Feedback Amplifier Clamp Voltage
Reference Voltage/Current Line Regulation
Voltage Gain
Soft-Start Charging Current
Soft-Start Discharge Current
500
1000
50
2.5
0.01
2000
40
1.5
nA
l
C
=
±
10
μ
A
G
400
30
1800
80
μ
mho
G
μ
A
V
12V
≤
V
IN
≤
18V
V
C
= 1V to 2V
V
SFST
= 0V
V
SFST
= 1.5V, V
UVLO
= 0V
G
0.05
%/V
V/V
μ
A
mA
25
0.8
50
Gate Output
V
GATE
Output High Level
I
GATE
= 100mA
I
GATE
= 500mA
I
GATE
= 100mA
I
GATE
= 500mA
V
GATE
= 2V
C
L
= 1000pF
C
L
= 1000pF
G
G
11.5
11.0
12.1
11.8
0.3
0.6
2.5
30
30
V
V
V
V
Output Low Level
G
G
0.45
1.0
I
GATE
t
r
t
f
Output Sink Current in Shutdown, V
UVLO
= 0V
Rise Time
Fall Time
G
1.2
mA
ns
ns
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