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AS2842 PDF预览

AS2842

更新时间: 2024-02-18 08:24:04
品牌 Logo 应用领域
其他 - ETC 控制器
页数 文件大小 规格书
20页 98K
描述
Current Mode Controller

AS2842 技术参数

生命周期:Obsolete包装说明:DIP,
Reach Compliance Code:unknownECCN代码:EAR99
HTS代码:8542.39.00.01风险等级:5.84
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:12 V标称输入电压:15 V
JESD-30 代码:R-PDIP-T8长度:9.21 mm
功能数量:1端子数量:8
最高工作温度:105 °C最低工作温度:-40 °C
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:DIP
封装形状:RECTANGULAR封装形式:IN-LINE
认证状态:Not Qualified座面最大高度:4.32 mm
最大供电电流 (Isup):17 mA表面贴装:NO
切换器配置:SINGLE最大切换频率:500 kHz
温度等级:INDUSTRIAL端子形式:THROUGH-HOLE
端子节距:2.54 mm端子位置:DUAL
宽度:7.62 mmBase Number Matches:1

AS2842 数据手册

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AS2842/3/4/5  
Current Mode Controller  
Fea tures  
Descrip tion  
2.5 V bandgap reference  
trimmed to 1.0% and  
temperature-compensated  
TheAS2842familyofcontrolICsprovidepin-for-pinreplace-  
ment of the industry standard UC3842 series of devices. The  
devices are redesigned to provide significantly improved  
tolerances in power supply manufacturing. The 2.5 V refer-  
ence has been trimmed to 1.0% tolerance. The oscillator  
discharge current is trimmed to provide guaranteed duty  
cycle clamping rather than specified discharge current. The  
circuit is more completely specified to guarantee all param-  
eters impacting power supply manufacturing tolerances.  
Extended temperature range  
from - 40 to 105° C  
AS2842/3 oscillations trimmed  
for precision duty cycle clamp  
AS2844/5 have exact 50% max  
duty cycle clamp  
In addition, the oscillator and flip-flop sections have been  
enhanced to provide additional performance. The RT/CT pin  
now doubles as a synchronization input that can be easily  
driven from open collector/open drain logic outputs. This  
sync input is a high impedance input and can easily be used  
for externally clocked systems. The new flip-flop topology  
allows the duty cycle on the AS2844/5 to be guaranteed  
between 49 and 50%. The AS2843/5 requires less than  
0.5 mA of start-up current over the full temperature range.  
Advanced oscillator design  
simplifies synchronization  
Improved specs on UVLO  
and hysteresis provide  
more predictable start-up  
and shutdown  
Improved 5 V regulator provides  
better AC noise immunity  
Guaranteed performance  
with current sense pulled  
below ground  
Ord ering Inform a tion  
Description  
Temperature Range  
-40 to 105° C  
Order Codes  
Over-temperature shutdown  
8-Pin Plastic DIP  
8-Pin Plastic SOIC  
AS2842/3/4/5N  
AS2842/3/4/5D-8  
-40 to 105° C  
Pin Config ura tion  
Top view  
PDIP (N)  
8L SOIC (D)  
COMP  
VFB  
1
2
3
4
8
7
6
5
VREG  
VCC  
COMP  
VFB  
1
2
3
4
8
7
6
5
VREG  
VCC  
ISENSE  
RT/CT  
OUT  
GND  
ISENSE  
RT/CT  
OUT  
GND  
ASTEC Semiconductor  
37  

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