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File name:uc3844.pdf
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Original Chassis:UC3844AN-MBR
Descr:PWM I-CNTRL 5V 52KHZ DIP08
Group:Electronics > Components > Integrated circuits >
Uploaded:2004-03-09 16:09:21
User:plamensl
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uc3844.pdfU-100A APPLICATION NOTE UC3842/3/4/5 PROVIDES LOW-COST CURRENT-MODE CONTROL INTRODUCTION CURRENT-MODE CONTROL The fundamental challenge of power supply design is to Figure 1 shows the two-loop current-mode control system simultaneously realize two conflicting objectives: good in a typical buck regulator application. A clock signal initi- electrical performance and low cost. The UC3842/3/4/5 ates power pulses at a fixed frequency. The termination of is an integrated pulse width modulator (PWM) designed each pulse occurs when an analog of the inductor current with both these objectives in mind. This IC provides de- reaches a threshold established by the error signal. In this signers an inexpensive controller with which they can ob- way the error signal actually cont

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