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UBA2021P Datasheet(PDF) 5 Page - NXP Semiconductors

Part # UBA2021P
Description  630 V driver IC for CFL and TL lamps
Download  16 Pages
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Manufacturer  NXP [NXP Semiconductors]
Direct Link  http://www.nxp.com
Logo NXP - NXP Semiconductors

UBA2021P Datasheet(HTML) 5 Page - NXP Semiconductors

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UBA2021_4
© NXP B.V. 2008. All rights reserved.
Product data sheet
Rev. 04 — 25 July 2008
5 of 16
NXP Semiconductors
UBA2021
630 V driver IC for CFL and TL lamps
7.5 Ignition state
The RS monitoring function changes from VRS(ctrl) regulation to capacitive mode
protection at the end of the preheat time. Normally this results in a further frequency
decrease down to the bottom frequency fB (approximately 43 kHz). The rate of change of
frequency in the ignition state is less than that in the preheat mode. During the downward
frequency sweep the circuit sweeps through the resonant frequency of the load. A high
voltage then appears across the lamp. This voltage normally ignites the lamp.
7.6 Failure to ignite
Excessive current levels may occur if the lamp fails to ignite. The IC does not limit these
currents in any way.
7.7 Transition to the burn state
Assuming that the lamp has ignited during the downward frequency sweep, the frequency
normally decreases to the bottom frequency. The IC can transit to the burn state in two
ways:
1. In the event that the bottom frequency is not reached, transition is made after
reaching the ignition time tign.
2. As soon as the bottom frequency is reached.
The bottom frequency is determined by RRREF and CCF.
7.8 Feed-forward frequency
During burn state a feed-forward mechanism ensures that the lamp power will not
increase above the maximum allowed value due to an increased mains voltage. In the
feed-forward range the UBA2021 driver IC can be configured in such a way that the
application is optimized for close to constant lamp power. Above a defined voltage level
the oscillation frequency also depends on the supply voltage of the half-bridge (see
Figure 6). The current for the current controlled oscillator is derived from the current
through RRHV in the feed-forward range. The feed-forward frequency is proportional to the
average value of the current through RRHV within the operating range of Ii(RHV), given the
lower limit set by fB. For currents beyond the operating range (i.e. between 1.0 mA and 1.6
mA) the feed-forward frequency is clamped. In order to prevent feed-forward of ripple on
Fig 5.
Operation in the preheat mode
mgs992
time
burn state
ignition
state
preheat state
fstart
fB


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