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UCC38050DRG4 Datasheet(PDF) 11 Page - Texas Instruments |
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UCC38050DRG4 Datasheet(HTML) 11 Page - Texas Instruments |
11 / 30 page UCC28050, UCC28051 UCC38050, UCC38051 SLUS515F−SEPTEMBER 2002 − REVISED MARCH 2009 11 www.ti.com APPLICATION INFORMATION UDG−02124 + C D Load + RIAC X X MULT L SQ R Q Gate Driver Logic VAC IAC ÷ ZCD IMO VEA VREF Figure 1. Basic Block Diagram of CRM Boost PFC The power stage equations and the transfer functions of the CRM are the same as the CCM. However, implementations of the control functions are different. Transition mode forces the inductor current to operate just at the border of CCM and DCM. The current profile is also different and affects the component power loss and filtering requirements. The peak current in the CRM boost is twice the amplitude of CCM leading to higher conduction losses. The peak-to-peak ripple is twice the average current which affects MOSFET switching losses and magnetics ac losses. UDG−02123 IAVERAGE (C) CRM (b) DCM (a) CCM IPEAK IAVERAGE IPEAK IAVERAGE Note: Operating Frequency >> 120 Hz Figure 2. PFC Inductor Current Profiles |
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