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LT1242IS8#TRPBF PDF预览

LT1242IS8#TRPBF

更新时间: 2024-11-02 03:11:59
品牌 Logo 应用领域
凌特 - Linear /
页数 文件大小 规格书
16页 284K
描述
High Speed Current Mode Pulse Width Modulators

LT1242IS8#TRPBF 数据手册

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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

LT1242IS8#TRPBF 替代型号

型号 品牌 替代类型 描述 数据表
UC2842BD1R2G ONSEMI

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UC3842BD1G ONSEMI

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