鈥?/div>
0.99 minimum power factor
Less than 10% THD
Programmable starting sequence for low glow
current and extended lamp life
Greater than 92% efficiency
All American
On-chip thermal and lamp out detection circuitry
Capsco
Power down threshold for GFI or end of lamp life
protection
Future Active Inc.
Digi-Key Corp.
Premier Magnetics
(800) 538-8587
(800) 723-5817, (408) 434-9599
(800) 344-4539
(714) 362-4211
(800) 222-6001
Shaded items in Table 1 indicate changes to the original
ML4833 Evaluation Board parts list.
VENDOR LIST
CONVERSION
To convert the ML4833 Evaluation Board to the non-
dimming design described:
1.
2.
3.
4.
Remove the dimmer control interface
subassembly.
Remove components R2,R3, R16, C4, C5 and T5
(as shown in Figure 2). Ground LAMP FB.
Replace R24 and C22 with jumpers and change
the values of R21 and R5 per Table 1.
The new components (R26, R27, C27 and D14)
can be assembled using available wiring at T5.
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.
R&D Electronic Parts (800) 675-1177
PCB Engineering
(408) 946-2075
EMI
Filter
Bridge
Rectifier
PFC
Inverter
Lamp
Network
198 - 242
VAC
ML4833
Interrupt
Figure 1. Functional Block Diagram
REV. 1.0 10/25/2000
1
2
3
4
