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參數資料
| 型號： | LT1249IS8#PBF |
| 廠商： | Linear Technology |
| 文件頁數： | 3/12頁 |
| 文件大?。?/td> | 197K |
| 描述： | IC PFC CTRLR AVERAGE CURR 8SOIC |
| 標準包裝： | 100 |
| 模式： | 平均電流 |
| 頻率 - 開關： | 100kHz |
| 電流 - 啟動： | 250µA |
| 電源電壓： | 15.5 V ~ 27 V |
| 工作溫度： | -40°C ~ 125°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 8-SOIC（0.154"，3.90mm 寬） |
| 供應商設備封裝： | 8-SOIC |
| 包裝： | 管件 |
| 產品目錄頁面： | 1338 (CN2011-ZH PDF) |
LT1249
3
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: Current amplifier is in linear mode with 0V input common mode.
Note 3: Multiplier Gain Constant: K =
Note 4: Maximum GTDR output voltage is internally clamped for higher
V
CC
voltages.
TYPICAL PERFORMANCE CHARACTERISTICS
FREQUENCY (Hz)
10
100
80
60
40
20
0
20
100 1k
10k 100k
1249 G01
1M 10M
0
20
40
60
80
100
120
PHASE
GAIN
Voltage Amplifier Open-Loop
Gain and Phase
FREQUENCY (Hz)
1k
400
350
300
250
200
150
100
50
0
20
0
20
40
60
80
100
120
140
100k
10k
1249 G02
1M
10M
g
m
?/DIV>
Transconductance of
Current Amplifier
I
M
I
AC
(VA
OUT
1.5)
2
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Reference
Reference Output Voltage
T
A
= 25癈, Measured at V
SENSE
Pin
7.39
7.5
7.6
V
Reference Output Voltage Worst Case
All Line, Temperature
q 7.32
7.5
7.68
V
Reference Output Voltage Line Regulation
V
LOCKOUT
< V
CC
< V
MAX
q
20
5
20
mV
Multiplier
Multiplier Output Current
I
AC
= 100礎, VA
OUT
= 5V
35
礎
Multiplier Output Current Offset
R
AC
= 1M from I
AC
to GND
q
0.05
0.5
礎
Multiplier Max Output Current (I
M(MAX)
)
I
AC
= 450礎, VA
OUT
= 7V (Note 2)
q
375
250
150
礎
Multiplier Max Output Voltage (I
M(MAX)
" R
MOUT
)
I
AC
= 450礎, VA
OUT
= 7V (Note 2)
q
1.25
1.1
0.96
V
Multiplier Gain Constant (Note 3)
0.035
V
2
I
AC
Input Resistance
I
AC
from 50礎 to 1mA
15
32
50
k&
Oscillator
Oscillator Frequency
q
75
100
125
kHz
Control Pin (CA
OUT
) Threshold
Duty Cycle = 0
q
1.3
1.8
2.3
V
Synchronization Frequency Range
Synchronizing Pulse Low d 0.35V on CA
OUT
q
127
160
kHz
Gate Driver
Max GTDR Output Voltage
0mA Load, 18V < V
CC
< V
MAX
(Note 4)
q
12
15
17.5
V
GTDR Output High
200mA Load, 11.5V d V
CC
d 15V
q V
CC
3.0
V
GTDR Output Low (Device Unpowered)
V
CC
= 0V, 50mA Load (Sinking)
q
0.9
1.5
V
GTDR Output Low (Device Active)
200mA Load (Sinking)
q
0.5
1
V
Peak GTDR Current
10nF from GTDR to GND
1.5
A
GTDR Rise and Fall Time
1nF from GTDR to GND
25
ns
GTDR Max Duty Cycle
90
96
%
ELECTRICAL CHARACTERISTICS
The q denotes specifications which apply over the operating temperature
range, otherwise specifications are at T
A
= 25?/SPAN>C. Maximum operating voltage (V
MAX
) = 25V, V
CC
= 18V, I
AC
= 100?/SPAN>A, CA
OUT
= 3.5V,
VA
OUT
= 5V, no load on any outputs, unless otherwise noted.
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