uba20261 NXP Semiconductors, uba20261 Datasheet - Page 5

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

NXP Semiconductors
7. Functional description
UBA20261_UBA20262
Preliminary data sheet
Fig 3.
(1) V
(2) V
(3) (End of ignition time AND HOLD = 0) OR V
(4) End of ignition time AND HOLD = 1.
(5) V
State diagram
V
DD
DD
CP
DD
< V
< V
< V
< V
DD(stop)
th(pd)CP
DD(start)
DD(stop)
, OR overcurrent fault time >
.
and (HOLD = 0 OR V
The UBA20261/2 are ICs with integrated half-bridge MOSFETs in self-ballasted
high-power CFLs. The UBA20261/2 have no dimming control input but instead, four
preset fixed dimming levels. Only minor adjustment of the presets is possible.
The UBA20261/2 are rated up to a maximum continuous rectified mains voltage of 350 V
or 500 V, respectively and lamp power-up to 20 W. The UBA20261/2 includes all functions
necessary for preheat, ignition and boost operation of the lamp. In addition, the IC
includes the four-step dimming feature and several protective features to safeguard CFL
operation. The controller states are shown in
V
DD
> V
preheat time
DD(rst)
completed
BOOST AND BURN
START-UP STATE
PREHEAT STATE
IGNITION STATE
RESET STATE
HOLD = 0
STATES
V
All information provided in this document is subject to legal disclaimers.
(1)
CP
DD
< V
= 0
Ignition_Detected
DD
th(rel)CP
Rev. 1 — 9 September 2011
1
V
⁄
10
DD
< V
t
ph
< V
DD(stop)
).
OR f
DD(rst)
bridge(max)
.
600 V and 350 V power IC for step dimmable CFLs
V
V
DD
CP
< V
detected in capacitive mode.
< V
(2)
(3)
DD(rst)
th(rel)CP
Figure
3.
HOLD STATE
HOLD = 1
(4)
(5)
POWER-DOWN STATE
UBA20261/2
© NXP B.V. 2011. All rights reserved.
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