Part # Application Notes Lighting Control BUL804 BUL704 BUL805 STX724 BUL3P5 bul3n7 STEVAL-ILB001V2 AN2349 datasheet

Part Manufacturer: ST Microelectronics

ST Microelectronics

Part Description: Simple Cost Effective PFC using Bipolar Transistors for low-to-medium power HF Ballasts


Part Details:

AN2349 Application note Simple cost-effective PFC using Bipolar Transistors for low-to-medium power HF Ballasts Introduction This note deals with the implementation of a Power Factor Correction (PFC) in a Discontinuous-mode Boost Converter where a PFC stage is achieved with a power bipolar transistor driven in self oscillating configuration. The new solution proposed exploits the physical relation (tS, IC) of any bipolar transistor to achieve the Pulse Width Modulation (PWM) signal in a Boost Converter. June 2006 Rev 1 1/30 www.st.com Contents AN2349 Contents 1 PFC solutions for low-medium power HF Ballasts . . . . . . . . . . . . . . . . 5 1.1 Application description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 2 Feedback block . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 3 Selection of boost output inductor L1 . . . . . . . . . . . . . . . . . . . . . . . . . 12 3.1 Selection of boost output capacitor C4 . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 4 PFC driving network . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 4.1 Feed-Back block . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 5 T Transformer and L1 inductor specifications . . . . . . . . . . . . . . . . . . 23 5.1 220V design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 5.2 120V design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 6 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 2/30 AN2349 List of tables List of tables Table 1. 40W Demoboard 220V bill of materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 Table 2. 40W Demoboard 120V bill of materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 Table 3. Document revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 3/30 Document Outline 1 PFC solutions for low-medium power HF Ballasts Figure 1. Valley Fill circuit schematic diagram Figure 2. Valley Fll input current waveform Figure 3. Active PFC with IC and MOSFET in boost topology


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Application Notes Lighting Control BUL804 BUL704 BUL805 STX724 BUL3P5 bul3n7 STEVAL-ILB001V2 AN2349.pdf Datasheet