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LT1508CSW PDF预览

LT1508CSW

更新时间: 2024-01-03 09:23:05
品牌 Logo 应用领域
凌特 - Linear 控制器
页数 文件大小 规格书
16页 340K
描述
Power Factor and PWM Controller(Voltage Mode)

LT1508CSW 技术参数

是否Rohs认证:不符合生命周期:Obsolete
零件包装代码:SOIC包装说明:0.300 INCH, PLASTIC, SO-20
针数:20Reach Compliance Code:compliant
ECCN代码:EAR99HTS代码:8542.39.00.01
风险等级:5.91Is Samacsys:N
模拟集成电路 - 其他类型:POWER FACTOR CONTROLLER WITH POST REGULATOR控制模式:VOLTAGE-MODE
控制技术:PULSE WIDTH MODULATION最大输入电压:25 V
最小输入电压:11.5 V标称输入电压:18 V
JESD-30 代码:R-PDSO-G20JESD-609代码:e0
长度:12.8 mm功能数量:1
端子数量:20最高工作温度:125 °C
最低工作温度:-40 °C封装主体材料:PLASTIC/EPOXY
封装代码:SOP封装形状:RECTANGULAR
封装形式:SMALL OUTLINE认证状态:Not Qualified
座面最大高度:2.65 mm表面贴装:YES
切换器配置:PUSH-PULL最大切换频率:115 kHz
温度等级:AUTOMOTIVE端子面层:Tin/Lead (Sn/Pb)
端子形式:GULL WING端子节距:1.27 mm
端子位置:DUAL宽度:7.5 mm
Base Number Matches:1

LT1508CSW 数据手册

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LT1508  
Power Factor and PWM  
Controller (Voltage Mode)  
U
FEATURES  
DESCRIPTION  
The LT® 1508 is a complete solution for universal off-line  
switching power supplies utilizing active power factor  
correction. The PFC section is identical to the LT1248 PFC  
controller except the EN/SYNC pin is removed because  
PFC and PWM are synchronized internally.  
PFC and PWM Single Chip Solution  
Synchronized Operation up to 300kHz  
99% Power Factor Over 20:1 Load Current Range  
Voltage Mode PWM  
Instantaneous Overvoltage Protection  
Dedicated Overvoltage Protection (OVP Pin)  
The voltage mode PWM section (LT1509 is the current  
mode counterpart) contains all the primary side functions  
to convert the PFC preregulated high voltage output to an  
isolated low voltage output. The PWM duty cycle is  
internally limited to 47% (maximum 50%) to prevent  
transformer saturation. PWM soft start begins when the  
PFC output reaches the preset voltage. In the event of brief  
line loss, PWM will be shut off when the PFC output  
voltage drops below 73% of the preset value.  
Minimal Line Current Dead Zone  
Typical 250µA Start-Up Supply Current  
Line Switching Noise Filter  
Low Quiescent Current: 13mA  
Fast 1.5A Peak Current Gate Drivers  
Separate Soft Start Control  
U
APPLICATIONS  
, LTC and LT are registered trademarks of Linear Technology Corporation.  
Universal Power Factor Corrected Power Supplies  
and Preregulators  
W
BLOCK DIAGRAM  
CA  
GND1  
3
PK  
LIM CC  
V
REF  
12  
M
I
OUT SENSE  
V
VA  
OUT  
OUT  
7.5V  
REF  
10  
8
7
6
5
17  
V
+
V
CC  
RUN  
7µA  
16V TO 10V  
2.2V  
+
M1  
+
V
+
SENSE  
14  
I
CA  
+
+
M
R
R
S
I
I
A
EA  
Q
2
GTDR1  
1
RUN  
I
I
A
B
2
7.5V  
7.9V  
I
M
=
25k  
I
AC  
9
200µA  
B
+
0.7V  
+
R
OVP  
11  
OSC  
2R  
16V  
14µA  
SS1  
16  
GND2  
2
4
C
SET  
R
15  
SET  
+
CL  
1V  
55%  
DELAY  
+
+
14µA  
S
R
R
7V TO  
4.7V  
+
GTDR2  
20  
Q
SS2  
13  
PWMOK  
200ns  
BLANKING  
16V  
50µA  
I
V
C
19  
NOTE: PWM PULSE IS DELAYED BY 55% DUTY CYCLE  
AFTER PFC PULSE  
18  
LIM  
1508 BD  
1

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