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LT1246CS8 PDF预览

LT1246CS8

更新时间： 2024-11-22 22:55:47
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

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中文翻译

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LT1246CS8 技术参数

是否Rohs认证： 不符合生命周期：Transferred
零件包装代码：SOIC包装说明：SOP, SOP8,.25
针数：8Reach Compliance Code：not_compliant
ECCN代码：EAR99HTS代码：8542.39.00.01
风险等级：5.61模拟集成电路 - 其他类型：SWITCHING CONTROLLER
控制模式：CURRENT-MODE控制技术：PULSE WIDTH MODULATION
最大输入电压：25 V最小输入电压：11 V
JESD-30 代码：R-PDSO-G8JESD-609代码：e0
长度：4.9 mm湿度敏感等级：1
功能数量：1端子数量：8
最高工作温度：70 °C最低工作温度：
最大输出电流：1 A标称输出电压：2.5 V
封装主体材料：PLASTIC/EPOXY封装代码：SOP
封装等效代码：SOP8,.25封装形状：RECTANGULAR
封装形式：SMALL OUTLINE峰值回流温度（摄氏度）：235
认证状态：Not Qualified座面最大高度：1.75 mm
子类别：Switching Regulator or Controllers最大供电电流 (Isup)：20 mA
表面贴装：YES切换器配置：SINGLE
最大切换频率：1000 kHz技术：BIPOLAR
温度等级：COMMERCIAL端子面层：Tin/Lead (Sn/Pb)
端子形式：GULL WING端子节距：1.27 mm
端子位置：DUAL处于峰值回流温度下的最长时间：20
宽度：3.9 mmBase Number Matches：1

LT1246CS8 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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中文翻译

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