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LT1508C

更新时间： 2024-11-10 22:55:51
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)

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中文翻译

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LT1508C 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
1234567...16

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