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PDF UBA2021 Data sheet ( Hoja de datos )
| Número de pieza | UBA2021 | |
| Descripción | 630V driver IC | |
| Fabricantes | Philips | |
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INTEGRATED CIRCUITS
DATA SHEET
UBA2021
630 V driver IC for CFL and TL
lamps
Product specification
Supersedes data of 2000 Jul 24
File under Integrated Circuits, IC11
2001 Jan 30
1 page  
Philips Semiconductors
630 V driver IC for CFL and TL lamps
Product specification
UBA2021
FUNCTIONAL DESCRIPTION
Introduction
The UBA2021 is an integrated circuit for electronically
ballasted compact fluorescent lamps and their derivatives
operating with mains voltages up to 240 V (RMS). It
provides all the necessary functions for preheat, ignition
and on-state operation of the lamp. In addition to the
control function, the IC provides level shift and drive
functions for the two discrete power MOSFETs, T1 and T2
(see Fig.7).
Initial start-up
Initial start-up is achieved by charging capacitor CS9 with
the current applied to pin RHV. At start-up, MOSFET T2
conducts and T1 is non-conducting, ensuring Cboot
becomes charged. This start-up state is reached for a
supply voltage VVS(reset) (this is the voltage level at pin VS
at which the circuit will be reset to the initial state) and
maintained until the low voltage supply (VVS) reaches a
value of VVS(start). The circuit is reset in the start-up state.
Oscillation
When the low voltage supply (VVS) has reached the value
of VVS(start) the circuit starts oscillating in the preheat state.
The internal oscillator is a current-controlled circuit which
generates a sawtooth waveform. The frequency of the
sawtooth is determined by the capacitor CCF and the
current out of pin CF (mainly set by RRREF). The sawtooth
frequency is twice the frequency of the signal across the
load. The IC brings MOSFETs T1 and T2 alternately into
conduction with a duty factor of approximately 50%.
Figure 4 represents the timing of the IC. The circuit block
'non-overlap' generates a non-overlap time tno that
ensures conduction periods of exclusively T1 or T2. Time
tno is dependent on the reference current IRREF.
handbook, halfpage
VCF
0
start-up
internal
clock
0
V(G1-S1)
0
V(G2)
0
t no
MGS991
t no
time
Fig.4 Oscillator timing.
Operation in the preheat mode
The circuit starts oscillating at approximately 2.5 × fB
(108 kHz). The frequency gradually decreases until a
defined value of current Ishunt is reached (see Fig.5). The
slope of the decrease in frequency is determined by
capacitor CCI. The frequency during preheating is
approximately 90 kHz. This frequency is well above the
resonant frequency of the load, which means that the lamp
is off; the load consists of L2, C5 and the electrode
resistance only. The preheat time is determined by
capacitor CCP. The circuit can be locked in the preheat
state by connecting pin CP to ground. During preheating,
the circuit monitors the load current by measuring the
voltage drop over external resistor Rshunt at the end of
conduction of T2 with decision level VRS(ctrl). The
frequency is decreased as long as VRS > VRS(ctrl). The
frequency is increased for VRS < VRS(ctrl).
2001 Jan 30
5
5 Page 
Philips Semiconductors
630 V driver IC for CFL and TL lamps
DESIGN EQUATIONS
• Bottom frequency: fB = -2----×-----{---[---(--C-----C----F----+-----C----p---a---r--)---×-----(---X--1--1-----×-----R----R----R----E---F----–-----R----i--n---t-)---]---+-----τ---}-
•
Feed-forward frequency:
fff
=
-------------------------------------------------------------1--------------------------------------------------------------
2
×
(CCF
+
Cpar)
×
X-----2---I--i×-(--R--V-H---R-V---R)---E---F--
–
Ri
n t
+
τ
Where:
– X1 = 3.68
– X2 = 22.28
– τ = 0.4 µs
– Rint = 3 kΩ
– Cpar = 4.7 pF
• Operating frequency is the maximum of fB, fff or fcm
Where:
– fB = bottom frequency
– fff = feed-forward frequency
– fcm = frequency due to capacitive mode detection
• Preheat time: tph = 1----5C---0--C---nP----F-- × R-3----0R----R-k--E-Ω---F-
• Ignition time: tign = 11----56-- × tph
• Non-overlap time: tno = 1.4 µs × -R-3---R0----Rk---EΩ----F-
Product specification
UBA2021
2001 Jan 30
11
11 Page | ||
| Páginas | Total 20 Páginas | |
| PDF Descargar | [ Datasheet UBA2021.PDF ] | |
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