参数资料
型号: UC3845D1X
厂商: FAIRCHILD SEMICONDUCTOR CORP
元件分类: 稳压器
中文描述: 1 A SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDSO8
封装: SOIC-8
文件页数: 1/20页
文件大小: 248K
代理商: UC3845D1X
2002 Fairchild Semiconductor Corporation
www.fairchildsemi.com
Rev. 1.0.1
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
14-SOP
1
8-SOP
1
Internal Block Diagram
UC3842/UC3843/UC3844/UC3845
SMPS Controller
* NORMALLY 8DIP/8SOP PIN NO.
* ( ) IS 14SOP PINNO.
* TOGGLE FLIP FLOP USED ONLY IN UC3844, UC3845
相关PDF资料
PDF描述
UC3843DX
UC3844DX
UC3845DX
UC3842DX
UC3844ADW 1 A SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDSO16
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