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LT1242CN8#PBF PDF预览

LT1242CN8#PBF

更新时间: 2024-11-02 10:44:43
品牌 Logo 应用领域
凌特 - Linear 开关光电二极管
页数 文件大小 规格书
16页 284K
描述
LT1242 - High Speed Current Mode Pulse Width Modulators; Package: PDIP; Pins: 8; Temperature Range: 0°C to 70°C

LT1242CN8#PBF 数据手册

 浏览型号LT1242CN8#PBF的Datasheet PDF文件第2页浏览型号LT1242CN8#PBF的Datasheet PDF文件第3页浏览型号LT1242CN8#PBF的Datasheet PDF文件第4页浏览型号LT1242CN8#PBF的Datasheet PDF文件第5页浏览型号LT1242CN8#PBF的Datasheet PDF文件第6页浏览型号LT1242CN8#PBF的Datasheet PDF文件第7页 
LT1241 Series  
High Speed Current Mode  
Pulse Width Modulators  
U
DESCRIPTIO  
EATURE  
S
F
Low Start-Up Current: < 250µA  
50ns Current Sense Delay  
Current Mode Operation: To 500kHz  
Pin Compatible with UC1842 Series  
Undervoltage Lockout with Hysteresis  
No Cross-Conduction Current  
The LT®1241 series devices are 8-pin, fixed frequency,  
currentmode,pulsewidthmodulators.Theyareimproved  
plugcompatibleversionsoftheindustrystandardUC1842  
series. These devices have both improved speed and  
lower quiescent current. The LT1241 series is optimized  
for off-line and DC/DC converter applications. They con-  
tain a temperature-compensated reference, high gain er-  
ror amplifier, current sensing comparator and a high  
current totem pole output stage ideally suited to driving  
power MOSFETs. Start-up current has been reduced to  
less than 250µA. Cross-conduction current spikes in  
the output stage have been eliminated, making 500kHz  
operation practical. Several new features have been incor-  
porated. Leading edge blanking has been added to the  
current sense comparator. Trims have been added to the  
oscillator circuit for both frequency and sink current, and  
both of these parameters are tightly specified. The output  
stage is clamped to a maximum VOUT of 18V in the  
on state. The output and the reference output are actively  
pulled low during undervoltage lockout.  
Trimmed Bandgap Reference  
1A Totem Pole Output  
Trimmed Oscillator Frequency and Sink Current  
Active Pull-Down on Reference and Output During  
Undervoltage Lockout  
High Level Output Clamp: 18V  
Current Sense LeO adU ing Edge Blanking  
PPLICATI  
S
A
Off-Line Converters  
DC/DC Converters  
, LTC and LT are registered trademarks of Linear Technology Corporation.  
W
BLOCK DIAGRA  
UV  
LOCKOUT  
REFERENCE ENABLE  
REFERENCE PULL-DOWN  
5V REF  
MAIN BIAS  
8
7
V
V
REF  
CC  
OUTPUT  
PULL-DOWN  
4
OSCILLATOR  
R /C  
T
T
T
6
5
OUTPUT  
GND  
S
R
5.6V  
1
2
1V  
COMP  
FB  
1mA  
+
2R  
BLANKING  
1.5V  
+
2.5V  
18V  
R
+
3
I
SENSE  
1241 BD01  
1

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