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UC3845 参数 Datasheet PDF下载

UC3845图片预览
型号: UC3845
PDF下载: 下载PDF文件 查看货源
内容描述: SMPS控制器 [SMPS Controller]
分类和应用: 控制器
文件页数/大小: 12 页 / 129 K
品牌: FAIRCHILD [ FAIRCHILD SEMICONDUCTOR ]
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www.fairchildsemi.com
UC3842/UC3843/UC3844/UC3845
SMPS Controller
Features
Low Start up Current
Maximum Duty Clamp
UVLO With Hysteresis
Operating Frequency up to 500KHz
Description
The UC3842/UC3843/UC3844/UC3845 are fixed
frequencycurrent-mode PWM controller. They are specially
designed for Off-Line and DC to DC converter applications
with minimum external components. These integrated
circuits feature a trimmed oscillator for precise duty cycle
control, a temperature compensated reference, high gain
error amplifier, current sensing comparator and a high
current totempole output for driving a Power MOSFET. The
UC3842 and UC3844 have UVLO thresholds of 16V (on)
and 10V (off). The UC3843 and UC3845 are 8.5V(on) and
7.9V (off). The UC3842 and UC3843 can operate within
100% duty cycle. The UC3844 and UC3845 can operate
with 50% duty cycle.
8-DIP
8-SOP
1
1
14-SOP
1
Internal Block Diagram
* NORMALLY 8DIP/8SOP PIN NO.
* ( ) IS 14SOP PINNO.
* TOGGLE FLIP FLOP USED ONLY IN UC3844, UC3845
Rev. 1.0.1
©2002 Fairchild Semiconductor Corporation