AN246 UC3842的电流模式控制提供低成本

AN246 UC3842的电流模式控制提供低成本
APPLICATION NOTE


UC3842 PROVIDES LOW-COST CURRENT-MODE CONTROL

The fundamental challenge of power supply design thods of avoiding common pitfalls discussed. The fi-
is to simultaneously realize two conflicting objecti- nal section presents designs of two power supplies
ves : good electrical performance and low cost. The utilizing UC3842 control.
UC3842 is an integrated pulse width modulator
(PWM) designed with both these objectives in mind. CURRENT-MODE CONTROL
This IC provides designers an inexpensive control-
Figure 1 shows the two-loop current-mode control
ler with which they can obtain all the performance