uba2213 NXP Semiconductors, uba2213 Datasheet - Page 7

• Manufacturer Part Number: uba2213
• Description: Half-bridge Power Ic Family For Cfl Lamps
• Manufacturer: NXP Semiconductors

NXP Semiconductors
UBA2213
Product data sheet
7.6 Ignition state
7.7 Boost state and transition to steady state
If during the preheat time, capacitive mode is sensed, the internal V
discharged. The frequency sweep increases until the system is set to the operating point
where capacitive mode switching is minimized.
The ignition state is entered after the preheat state has finished. The capacitor on pin SW
(C
During this frequency sweep, the resonance frequency is reached resulting in the ignition
of the lamp (see
resonance frequency. The ignition state ends when the voltage on pin SW (V
0.6  V
The boost state is entered after ignition. During boost period, VCO’s input is connected to
an internal voltage to get the fix frequency f
than steady state, the current ratio can be set by external component. Capacitor C
charged and discharged using an internal current generated saw-tooth waveform which
sets boost time.
C
Fig 5.
sw
SW
V
2.5 × f
SWinter
0.6 × V
V
=
) is charged by I
V
V
SW
SW
f
SW
osc(boost)
H(RC)
----------------------------------- -
1.5 s
f
osc(nom)
osc(nom)
boostH
boostL
HIGH
V
boost
H(RC)
lamp
.

t
ph
100 nF
, f
All information provided in this document is subject to legal disclaimers.
osc(int)
Figure
V
preheat
SW(ph)
SW
Rev. 2 — 21 November 2011
, V
4). The lamp inductor (L
SW
up to 0.6  V
ignition
, and V
SW(ph)
H(RC)
plotted against time
min
which corresponds to the frequency f
Half-bridge power IC family for CFL lamps
. The UBA2213 can provide a higher current
boost
... ...
lamp
) and lamp capacitor (C
SW(ph)
UBA2213
transition
© NXP B.V. 2011. All rights reserved.
node is
lamp
SW
) set
001aan139
) reaches
osc(nom)
RMS
f
osc(int)
V
SW
V
lamp
SW
7 of 21
is
(3)
.