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LT1242IJ8 [Linear]

IC SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, CDIP8, CERAMIC, DIP-8, Switching Regulator or Controller;
LT1242IJ8
型号： LT1242IJ8
厂家： Linear    Linear
描述：

IC SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, CDIP8, CERAMIC, DIP-8, Switching Regulator or Controller

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文件： 总2页 (文件大小：141K)
中文：  中文翻译
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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  
Power Factor Correction and  
Off-Line Converter Products – InfoCard 6  
LT1248/LT1249 Power Factor Controllers  
Features  
Applications  
■
■
High Power Factor Over Wide Load Range  
Universal Power Factor Corrected Power Supplies  
Preregulators  
■
with Line Current Averaging  
■
■
■
■
■
■
■
■
■
TOP VIEW  
International Operation Without Switches  
Instantaneous Overvoltage Protection  
Minimal Line Switching Noise  
Typical 250µA Start-Up Supply Current  
Rejects Line Switching Noise  
Synchronization Capability  
Low Quiescent Current: 9mA  
1
2
3
4
5
6
7
8
16 GTDR  
GND  
TOP VIEW  
15  
14  
V
PK  
CC  
LIM  
OUT  
GND  
1
2
3
4
GTDR  
8
7
6
5
C
CA  
SET  
LT1249CN8  
LT1249IN8  
LT1249CS8  
LT1249IS8  
CA  
OUT  
M
OUT  
V
LT1248CN  
LT1248IN  
LT1248CS  
LT1248IS  
CC  
13 SS  
I
SENSE  
V
SENSE  
12  
11  
R
V
M
OUT  
SET  
I
AC  
VA  
OUT  
I
AC  
SENSE  
N8 PACKAGE  
8-LEAD PLASTIC DIP  
S8 PACKAGE  
8-LEAD PLASTIC SOIC  
10 EN/SYNC  
VA  
OUT  
9
V
REF  
OVP  
Fast 1.5A Peak Current Gate Driver  
8-Lead Surface Mount Package: LT1249  
N PACKAGE  
16-LEAD PLASTIC DIP  
S PACKAGE  
16-LEAD NARROW PLASTIC SOIC  
LT1105/LT1103 Simplified Off-Line Switcher  
LT1103  
(INTERNAL SENSE RESISTOR)  
APPLICATION  
LT1105  
Universal Off-Line  
10W to Over 100W  
10W to 50W  
Battery Charger, Isolated Off-Line  
Telecom, –48V Input Isolated  
Low Voltage Isolated DC/DC (≤24V)  
High Voltage Isolated DC/DC  
OK  
OK  
OK  
OK  
Needs No MOSFET  
OK  
Requires External MOSFET  
OK  
LT1103 Minimum Parts Count Isolated Off-Line Converter  
No Opto-Isolators!  
OPTIONAL OUTPUT FILTER  
MBR2045  
85 - 270V  
10µH  
AC  
5V  
10A  
1.5KE300A  
5W  
+
+
+
50V  
470µF  
35V  
3600µF  
220k  
1W  
DANGER!!  
+
MUR150  
220µF  
385V  
HIGH VOLTAGE!!  
499Ω  
*OUTPUT CAPACITOR IS THREE 1200µF,  
50V CAPACITORS IN PARALLEL TO  
ACHIEVE REQUIRED RIPPLE CURRENT  
RATING AND LOW ESR.  
–
1N4148  
1000pF  
100Ω  
BRIDGE  
RECTIFIER  
+
WINDINGS FOR  
OPTIONAL  
BAV21  
LINE  
BUK426-800A  
V
V
±12V OUTPUTS  
FILTER  
SW  
IN  
DC  
BAV21  
+
39µF  
25V  
LT1103  
15V  
16.2k  
1%  
10Ω  
TRANSFORMER DATA:  
COILTRONICS - CTX110228-3  
= 1.6mH  
FB  
L
(PRI)  
+
GND  
OSC  
V
1µF  
5.36k  
1%  
C
N
:N  
= 1:0.05  
= 1:0.27  
PRI SEC  
25V  
N
:N  
BIAS SEC  
390pF  
330Ω  
0.1µF  
0.047µF  
LT1103 TA01  
Linear Technology Corporation • 1630 McCarthy Blvd. • Milpitas, CA 95035-7417 • (408) 432-1900 • www.linear-tech.com • Literature Only: 1-800-4-LINEAR  
©1992 LT/GP 0496 10K  

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