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LT1247C PDF预览

LT1247C

更新时间: 2024-11-03 22:34:27
品牌 Logo 应用领域
凌特 - Linear 转换器
页数 文件大小 规格书
12页 291K
描述
1MHz Off-Line Current Mode PWM and DC/DC Converter

LT1247C 数据手册

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LT1246/LT1247  
1MHz Off-Line  
Current Mode PWM  
and DC/DC Converter  
U
DESCRIPTIO  
EATURE  
S
F
The LT®1246/LT1247 are 8-pin, fixed frequency, current  
mode, pulse width modulators. These devices are de-  
signed to be improved plug compatible versions of the  
industry standard UC1842 PWM circuit. The LT1246/  
LT1247 are optimized for off-line and DC/DC converter  
applications. They contain a temperature compensated  
reference, high gain error amplifier, current sensing com-  
parator, 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 cur-  
rent spikes in the totem pole output stage have been  
eliminated, making1MHzoperationpractical. Severalnew  
features have been incorporated. Leading edge blanking  
has been added to the current sense comparator. This  
minimizesoreliminatesthefilterthatisnormallyrequired.  
Eliminating this filter allows the current sense loop to  
operate with minimum delays. 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 under-voltage lockout.  
Current Mode Operation to 1MHz  
30ns Current Sense Delay  
< 250µA Low Start-Up Current  
Current Sense Leading Edge Blanking  
Pin Compatible with UC1842  
Undervoltage Lockout with Hysteresis  
No Cross-Conduction Current  
Trimmed Bandgap Reference  
1A Totem Pole Output  
Trimmed Oscillator Frequency and Sink Current  
Active Pull-Down on Reference and Output During  
Undervoltage Lockout  
18V High Level Output Clamp  
O U  
PPLICATI  
S
A
Off-Line Converters  
DC/DC Converters  
Minimum  
Operating  
Voltage  
Start-Up  
Threshold  
Maximum  
Duty Cycle  
Device  
Replaces  
LT1246  
LT1247  
16V  
8.4V  
10V  
7.6V  
100%  
100%  
UC1842  
UC1843  
, LTC and LT are registered trademarks of Linear Technology Corporation.  
W
BLOCK DIAGRA  
REFERENCE ENABLE  
UV  
LOCKOUT  
REFERENCE PULLDOWN  
5V REF  
MAIN BIAS  
8
7
V
V
REF  
CC  
OUTPUT  
PULLDOWN  
4
OSCILLATOR  
R /C  
T
T
S
R
6
5
OUTPUT  
GND  
5.6V  
1
2
COMPENSATION  
FEEDBACK  
1V  
1mA  
+
2R  
BLANKING  
1.5V  
2.5V  
18V  
R
+
+
3
I
SENSE  
LT1246 • BD01  
1

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