LT1249
1
Power Factor Controller
s
Standard 8-Pin Packages
s
High Power Factor Over Wide Load Range
with Line Current Averaging
s
International Operation Without Switches
s
Instantaneous Overvoltage Protection
s
Minimal Line Current Dead Zone
s
Typical 250礎 Start-Up Supply Current
s
Rejects Line Switching Noise
s
Synchronization Capability
s
Low Quiescent Current: 9mA
s
Fast 1.5A Peak Current Gate Driver
The 8-pin LT
?/DIV>
1249 provides active power factor correc-
tion for universal offline power systems with very few
external parts. By using fixed high frequency PWM current
averaging without the need for slope compensation, the
LT1249 achieves far lower line current distortion, with a
smaller magnetic element than systems that use either peak
current detection or zero current switching approach, in
both continuous and discontinuous modes of operation.
The LT1249 uses a multiplier containing a square gain
function from the voltage amplifier to reduce the AC gain
at light output load and thus maintains low line current
distortion and high system stability. The LT1249 also
provides filtering capability to reject line switching noise
which can cause instability when fed into the multiplier.
Line current dead zone is minimized with low bias voltage
at the current input to the multiplier.
The LT1249 provides many protection features including
peak current limiting and overvoltage protection. The
switching frequency is internally set at 100kHz.
While the LT1249 simplifies PFC design with minimal
parts count, the LT1248 provides flexibilities in switching
frequency, overvoltage and current limit.
+
+
+
+
+
I
M
=
I
A
2
I
B
200礎
2
VA
OUT
7.5V
44礎
22礎
15礎
1V
EA
+
32k
I
A
I
B
20礎
250礎 MAX
I
M
7.5V
V
REF
0.7V
OSC
R
S
Q
6
4
5
3
2
1
7
8
35pF
I
AC
V
SENSE
M
OUT
R
MOUT
4k
4k
CA
OUT
V
CC
V
CC
16V/10V
CA
MULTIPLIER
RUN
RUN
16V
GND
GTDR
1249 BD
SYNC
M1
g
m
= 1/3k
, LTC and LT are registered trademarks of Linear Technology Corporation.
s
Universal Power Factor Corrected Power Supplies
s
Preregulators up to 1500W
FEATURES
DESCRIPTIO
APPLICATIO S
BLOCK DIAGRA
发布紧急采购，3分钟左右您将得到回复。
相关PDF资料
LT1577CS-3.3/2.8#TRPBF
IC REG CTRLR DUAL OUT 16SOIC
LT1640HIN8#PBF
IC CONTRLR HOTSWAP NEGVOLT 8-DIP
LT1641IS8#TR
IC CTRLR HOTSWAP POS VOLT 8SOIC
LT1939IDD#TRPBF
IC REG DL BUCK/LINEAR 12DFN
LT3092MPST#TRPBF
IC PROG CURRENT SOURCE SOT223-3
LT3150CGN#TRPBF
IC REG CTRLR SGL POS ADJ 16-SSOP
LT3500HMSE#TRPBF
IC REG DL BUCK/LINEAR 16-MSOP
LT3507HUHF#TRPBF
IC REG QD BUCK/LINEAR 38-QFN
相关代理商/技术参数
LT1249IS8#TR
功能描述:IC PFC CTRLR AVERAGE CURR 8SOIC RoHS:否 类别:集成电路 (IC) >> PMIC - PFC（功率因数修正） 系列:- 产品培训模块:GreenChip Synchronous Rectification Control Family of ICs 标准包装:1 系列:- 模式:间歇导电（DCM） 频率 - 开关:- 电流 - 启动:- 电源电压:8.6 V ~ 38 V 工作温度:-20°C ~ 150°C 安装类型:表面贴装 封装/外壳:14-SOIC（0.154"，3.90mm 宽） 供应商设备封装:14-SO 包装:Digi-Reel® 其它名称:568-5348-6
LT1249IS8#TRPBF
功能描述:IC PFC CTRLR AVERAGE CURR 8SOIC RoHS:是 类别:集成电路 (IC) >> PMIC - PFC（功率因数修正） 系列:- 产品培训模块:GreenChip Synchronous Rectification Control Family of ICs 标准包装:1 系列:- 模式:间歇导电（DCM） 频率 - 开关:- 电流 - 启动:- 电源电压:8.6 V ~ 38 V 工作温度:-20°C ~ 150°C 安装类型:表面贴装 封装/外壳:14-SOIC（0.154"，3.90mm 宽） 供应商设备封装:14-SO 包装:Digi-Reel® 其它名称:568-5348-6
LT124XC
制造商:LINER 制造商全称:Linear Technology 功能描述:High Speed Current Mode Pulse Width Modulators
LT124XCJ8
制造商:LINER 制造商全称:Linear Technology 功能描述:High Speed Current Mode Pulse Width Modulators
LT124XCN8
制造商:LINER 制造商全称:Linear Technology 功能描述:High Speed Current Mode Pulse Width Modulators
LT124XCS8
制造商:LINER 制造商全称:Linear Technology 功能描述:High Speed Current Mode Pulse Width Modulators
LT124XI
制造商:LINER 制造商全称:Linear Technology 功能描述:High Speed Current Mode Pulse Width Modulators
LT124XIN8
制造商:LINER 制造商全称:Linear Technology 功能描述:High Speed Current Mode Pulse Width Modulators