uba20261 NXP Semiconductors, uba20261 Datasheet - Page 13

• Manufacturer Part Number: uba20261
• Description: 600 V And 350 V Power Ic For Step Dimmable Cfls
• Manufacturer: NXP Semiconductors

NXP Semiconductors
UBA20261_UBA20262
Preliminary data sheet
Four internal references determine the actual internal set point levels used for the different
step dim levels. Depending on the selected dim level, the current control feedback loop
regulates the voltage on the CSI pin. In this way, it ensures that V
the selected internal set point voltages. The sequence of the four dim steps shown in
Figure 11
Where
Fig 10. Supply voltage cycle for dim step change
•
•
•
•
•
The lamp is switched off longer than the memory retention time: the IC starts up in the
DIM_1 mode (lamp is 100 % on, no dimming)
After lamp off/on toggling, the IC twice enters DIM_2 mode: the lamp is dimmed to
approximately 66 %
The next lamp off/on toggling, the IC enters DIM_3 mode: the lamp is dimmed
approximately 33 %
Toggling the lamp off/on again: the IC enters the MDL (Minimum Dimming Level)
mode. This level equals approximately 10 %
Renewed toggling enters the DIM_1 mode again.
V
(1)
V
ret(dim)CP
V
DD(start)
DD(stop)
V
is as follows:
= R
DD(rst)
voltage
MDL
5
0
(V)
All information provided in this document is subject to legal disclaimers.
= 2 k
old dim level
lamp on
Rev. 1 — 9 September 2011
(1)
(1)
of its initial light output
of its initial light output
dim step
change
600 V and 350 V power IC for step dimmable CFLs
retention
lamp off
(1)
of the initial light output
start-up
UBA20261/2
i(CSI)
new dim level
lamp on
is equal to one of
© NXP B.V. 2011. All rights reserved.
001aam769
V
V
time (s)
DD
CP
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