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ABR-42022 Datasheet(PDF) 1 Page - Fairchild Semiconductor |
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ABR-42022 Datasheet(HTML) 1 Page - Fairchild Semiconductor |
1 / 4 page ![]() August 1997 Application Brief 42022 ML4833 220V Non-Dimming Ballast Design Figure 1. Functional Block Diagram GENERAL DESCRIPTION This Application Brief exists as a supplement to Application Note 63. When used with Application Note 63, this document contains all the necessary information to convert an ML4833 Evaluation Board into a low-cost, non-dimming 220V ballast. This power factor corrected, 60W non-dimming ballast operates over a 187 to 253VRMS line, and is designed to power two series connected F32T8 lamps. The design preserves the features of the dimming ballast, which include: • 0.99 minimum power factor • Less than 10% THD • Programmable starting sequence for low glow current and extended lamp life • Greater than 92% efficiency • On-chip thermal and lamp out detection circuitry • Power down threshold for GFI or end of lamp life protection The mode of operation used for preheating and striking of the lamps is the widely accepted variable frequency, non- overlapping inverter topology. Specific details on power factor correction and resonant lamp network design can be obtained from Application Note 63. CONVERSION To convert the ML4833 Evaluation Board to the non- dimming design described: 1. Remove the dimmer control interface subassembly. 2. Remove components R2,R3, R16, C4, C5 and T5 (as shown in Figure 2). Ground LAMP FB. 3. Replace R24 and C22 with jumpers and change the values of R21 and R5 per Table 1. 4. The new components (R26, R27, C27 and D14) can be assembled using available wiring at T5. Shaded items in Table 1 indicate changes to the original ML4833 Evaluation Board parts list. VENDOR LIST All American (800) 222-6001 Capsco (800) 538-8587 Future Active Inc. (800) 723-5817, (408) 434-9599 Digi-Key Corp. (800) 344-4539 Premier Magnetics (714) 362-4211 R&D Electronic Parts (800) 675-1177 PCB Engineering (408) 946-2075 Interrupt EMI Filter Bridge Rectifier PFC Inverter Lamp Network 198 - 242 VAC ML4833 REV. 1.0 10/25/2000 |
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Similar Description - ABR-42022 |
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