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LT1242IJ8 PDF预览

LT1242IJ8

更新时间： 2024-11-02 06:23:43
品牌 Logo 应用领域
凌特 - Linear 开关
页数 文件大小 规格书
2页 141K
描述
IC SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, CDIP8, CERAMIC, DIP-8, Switching Regulator or Controller

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LT1242IJ8 数据手册

 浏览型号LT1242IJ8的Datasheet PDF文件第2页 
Pulsewidth Modulator Controllers for  
Off-Line and DC/DC Converters – InfoCard 6  
TOP VIEW  
LT1508/LT1509 Combined Power Factor Correction  
GTDR1  
GND2  
GND1  
1
2
20  
19  
18  
17  
16  
15  
14  
13  
12  
11  
GTDR2  
(LT1508)  
RAMP (LT1509)  
Controller/PWM Controller  
I
LIM  
■
3
V
C
Universal Input Off-Line PFC and PWM Single Chip Solution  
Current Mode PWM (LT 1509)  
Voltage Mode PWM (LT1508)  
Internally Synchronized Operation Up to 300kHz  
99% Power Factor Over 20:1 Load Current Range  
Instantaneous Overvoltage Protection  
PWM Soft Start After PFC Output Reaches Threshold Voltage  
®
C
4
V
CC  
SET  
■
PK  
LIM  
5
SS1  
■
CA  
6
R
SET  
OUT  
■
I
7
V
SENSE  
SENSE  
■
M
8
SS2  
OUT  
I
AC  
9
V
REF  
■
VA  
10  
OVP  
OUT  
■
N PACKAGE  
20-LEAD PDIP  
SW PACKAGE  
■
20-Lead PDIP and Wide SO Packages  
20-LEAD PLASTIC SO WIDE  
LT1241–LT1246 Series Key Features  
TOP VIEW  
■
■
■
■
■
■
■
■
Trimmed Oscillator Frequency and Sink Current  
Active Pull-Down on Reference and Output  
During Undervoltage Lockout  
Low Start-Up Current (<250µA)  
50ns Current Sense Delay  
COMP  
FB  
1
2
3
4
8
7
6
5
V
V
REF  
■
CC  
Current Mode Operation to 1MHz  
Current Sense Leading Edge Blanking  
Pin Compatible with UC1842/UC3842 Series  
No Cross-Conduction Current  
1A Totem Pole Output  
I
OUTPUT  
GND  
SENSE  
■
■
R /C  
High Level Output Clamp (18V)  
Industrial Temperature Range Available  
(–40°C to 85°C)  
T
T
J8 PACKAGE  
N8 PACKAGE  
8-LEAD CERAMIC DIP 8-LEAD PLASTIC DIP  
S8 PACKAGE  
8-LEAD PLASTIC SOIC  
LT1241 IC • 02  
LTC High Speed  
PWM Controller  
Family  
START-UP  
OPERATING  
(TYP)  
MAX  
MAX  
BLANKING  
SUPPLY CURRENT  
(mA) (MAX)  
PART  
THRESHOLD (TYP)  
V
DUTY CYCLE  
SWITCH FREQ.*  
TIME (TYP)  
100ns  
100ns  
100ns  
100ns  
100ns  
70ns  
CC  
LT1241  
LT1242  
LT1243  
LT1244  
LT1245  
LT1246  
LT1247  
9.6V  
16V  
8.4V  
16V  
8.4V  
16V  
8.4V  
7.6V  
50%  
100%  
100%  
50%  
500kHz  
500kHz  
500kHz  
500kHz  
500kHz  
1MHz  
10  
10  
10  
10  
10  
20  
20  
10V  
7.6V  
10V  
7.6V  
10V  
7.6V  
50%  
100%  
100%  
1MHz  
70ns  
*Recommended Maximum Determined by Rise/Fall Times at 1000pF Loads  
Short Current Sense Delay means  
faster reaction to output overload  
conditions. Magnetics and passive  
components do not need to be  
oversized.  
LT1241–LT1245  
LT1241–LT1245  
Output Cross-Conduction Current  
Output Rise and Fall Time  
V
CC = 15V  
VCC = 15V  
C
L = 15pF  
C
L = 1nF  
LT1241–LT1245  
Current Sense Delay  
V
CC = 15V  
C
L = 1nF  
TIME 50ns/DIV  
TIME 50ns/DIV  
Low Output Cross-Conduction means  
LOWER SUPPLY CURRENT draw at  
higher switching frequencies. Switch-  
ing at higher than 200kHz is now  
practical and more efficient.  
Fast Output Rise and Fall Times  
with clean edges give better high  
frequency switching performance.  
FET switches can be turned ON and  
OFF efficiently and quickly.  
TIME 50ns/DIV  
Rev D 0496  
, LTC and LT are registered trademarks of Linear Technology Corporation.  
Linear Technology Corporation • 1630 McCarthy Blvd. • Milpitas, CA 95035-7417 • (408) 432-1900 • www.linear-tech.com • Literature Only: 1-800-4-LINEAR  
12

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