基于LM2743的开关电源应用分析

Set-top boxes, DSL / ADSL, cable modems and other communication devices often use the high-performance switching-power supply circuits based on integrated circuit LM2743. This article describes the working principle and the selection of external components with switching 3.3V to 1.2V switching-power supply circuit base on LM2743. Switching-power supply circuit mainly consist by the switching-power supply control chip and peripheral devices which including the input capacitors, the input inductance, the upper and lower MOS tube, the output inductor and the output capacitor. The appropriateness of choosing the peripheral device parameters directly affect the efficiency of switching-power and stability of circuit.