Characteristics of ripple attenuates with low power SMPS based on CLC circuit
Cheng Yi, Xianguo Tuo, Fan Leilei, Jing Liu, Honghui Wang · Chinese Journal of Power Sources · 2011
The low power switching power supply is commonly used for the system energy supply in portable instruments.And the ripple noise of power supply directly affected the system performance.A 12 V switching power supply based on MAX606 was designed with a π-type CLC low-pass filter to attenuate the output ripple.By changing the type of electrolytic capacitors(SMD aluminum electrolytic,line electrolytic,SMD tantalum electrolytic),the size of capacitor,inductance and load resistance,the ripple attenuates of CLC circuit was illustrated.The results show that in the CLC circuit of low power switching power supply,the inductance plays an important role in ripple rejection,and capacitor takes the second;the effect of SMD aluminum electrolytic is the best,line electrolytic is the second and SMD tantalum electrolytic is the worst;the capacitance above 100 μF and mH inductance level should be used.