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File name:uc3844.pdf
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Original:UC3844AN-MBR 🔎
Descr:PWM I-CNTRL 5V 52KHZ DIP08
Group:Electronics > Components > Integrated circuits
Uploaded:09-03-2004
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File name uc3844.pdf

U-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 controls peak inductor cur- tain all the performance advantages of current mode op- rent. This contrasts with conventional schemes in which eration. In addition, the UC3842 series is optimized for ef- the error signal directly controls pulse width without regard ficient power sequencing of off-line converters, DC to DC to inductor current. regulators and for driving power MOSFETs or transistors. Several performance advantages result from the use of This application note provides a functional description of current-mode control. First, an input voltage feed-forward the UC3842 family and highlights the features of each in- characteristic is achieved; i.e., the control circuit instanta- dividual member, the UC3842, UC3843, UC3844 and neously corrects for input voltage variations without using UC3845 Throughout the text, the UC3842 part number up any of the error amplifier's dynamic range. Therefore, will be referenced, however the generalized circuits and line regulation is excellent and the error amplifier can be performance characteristics apply to each member of the dedicated to correcting for load variations exclusively. UC3842 series unless otherwise noted. A review of cur- rent mode control and its benefits is included and meth- For converters in which inductor current is continuous, ods of avoiding common pitfalls are mentioned. The final controlling peak current is nearly equivalent to controlling section presents designs of power supplies utilizing average current. Therefore, when such converters employ UC3842 control. current-mode control, the inductor can be treated as an

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