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PDF ABR-42022 Data sheet ( Hoja de datos )
| Número de pieza | ABR-42022 | |
| Descripción | ML4833 220V Non-Dimming Ballast Design | |
| Fabricantes | Fairchild Semiconductor | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de ABR-42022 (archivo pdf) en la parte inferior de esta página. Total 4 Páginas | ||
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August 1997
Application Brief 42022
ML4833 220V Non-Dimming Ballast Design
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
EMI
Filter
198 - 242
VAC
Bridge
Rectifier
PFC
Inverter
Lamp
Network
ML4833
Interrupt
Figure 1. Functional Block Diagram
REV. 1.0 10/25/2000
1 page | ||
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| PDF Descargar | [ Datasheet ABR-42022.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| ABR-42022 | ML4833 220V Non-Dimming Ballast Design | Fairchild Semiconductor |
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