参数资料
型号: LT1082M
厂商: Linear Technology Corporation
英文描述: Parallel-Load 8-Bit Serial Shift Registers 16-SSOP 0 to 70
中文描述: 1A条高电压,效率开关稳压器
文件页数: 3/12页
文件大小: 250K
代理商: LT1082M
3
LT1082
ELECTRICAL C
HARA TERISTICS
V
IN
= 15V, V
C
= 0.5V, V
FB
= V
REF
, output pin open, unless otherwise specified.
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
I
Q
Supply Current
Control Pin Threshold
3V
V
IN
V
MAX
, V
C
= 0.6V
Duty Cycle = 0
4.5
0.9
7.0
1.1
1.25
0.8
mA
0.7
0.5
0.58
V
V
V
G
Normal/Flyback Threshold
on Feedback Pin
Switching Frequency
0.67
f
50
45
60
70
75
kHz
kHz
kHz
G
800
μ
A
I
FB
450
μ
A
3V
V
IN
V
MAX
, I
SW
= 1.5mA
12
115
1.5
BV
Output Switch Breakdown Voltage
Control Voltage to Switch
Current Transconductance
Flyback Reference Voltage
G
100
V
A/V
V
FB
I
FB
= 60
μ
A
17
16
3.5
18.6
20.5
21.5
6.5
0.03
500
70
90
1.2
2.6
2.6
2.4
2.8
2.8
2.6
3.0
3.0
2.8
45
V
V
V
G
Change in Flyback Reference Voltage
Flyback Reference Voltage Line Regulation
Flyback Amplifier Transconductance (g
m
)
Flyback Amplifier Source
and Sink Current
Output Switch “On” Resistance (Note 1)
Switch Current Limit
(LT1082C)
60
μ
A
I
FB
200
μ
A
I
FB
= 60
μ
A, 3V
V
IN
V
MAX
I
C
=
±
10
μ
A
V
C
= 0.6V Source
I
FB
= 60
μ
A Sink
I
SW
= 0.7A (LT1082C), I
SW
= 0.5A (LT1082M)
Duty Cycle = 20%
Duty Cycle
50%
Duty Cycle = 80% (Note 2)
Duty Cycle = 20%
Duty Cycle
50%
Duty Cycle = 80% (Note 2)
Duty Cycle = 20%
Duty Cycle
50%
Duty Cycle = 80% (Note 2)
4.6
0.01
300
32
50
0.8
%/V
μ
mho
150
15
30
G
G
μ
A
μ
A
A
A
A
A
A
A
A
A
A
V
SAT
I
LIM
G
G
G
G
1.07
1.0
0.8
0.85
0.8
0.65
0.75
0.7
0.6
Switch Current Limit
(LT1082I)
G
G
G
Switch Current Limit
(LT1082M)
G
G
G
I
IN
I
SW
DC
MAX
Supply Current Increase
During Switch-On Time
Maximum Switch Duty Cycle
Flyback Sense Delay Time
Shutdown Mode Supply Current
Shutdown Mode
Threshold Voltage
35
mA/A
85
92
1.5
120
150
97
%
μ
s
μ
A
mV
mV
3V
V
IN
V
MAX
, V
C
= 0.05V
3V
V
IN
V
MAX
350
250
300
70
50
G
The
G
denotes the specifications which apply over the operating
temperature range.
Note 1:
Measured with V
C
in hi clamp, V
FB
= 0.8V.
Note 2:
For duty cycles (DC) between 50% and 80%, minimum
guaranteed switch current decreases linearly.
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