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UBA2021P-UBA2021T
630 V driver IC for CFL and TL lamps
Philips Semiconductors Product specification
630 V driver IC for CFL and TL lamps UBA2021
FEATURES Adjustable preheat and ignition time Adjustable preheat current Adjustable lamp power Lamp temperature stress protection at higher mains
voltages Capacitive mode protection Protection againsta too-low drive voltagefor the power
MOSFETs.
GENERAL DESCRIPTIONThe UBA2021 is a high-voltage IC intended to drive and
control Compact Fluorescent Lamps (CFL)or fluorescent
TL-lamps. It contains a driver circuit for an external
half-bridge, an oscillator and a control circuit for starting
up, preheating, ignition, lamp burning and protection.
QUICK REFERENCE DATA
Philips Semiconductors Product specification
630 V driver IC for CFL and TL lamps UBA2021
ORDERING INFORMATION
BLOCK DIAGRAM
Philips Semiconductors Product specification
630 V driver IC for CFL and TL lamps UBA2021
PINNING
Philips Semiconductors Product specification
630 V driver IC for CFL and TL lamps UBA2021
FUNCTIONAL DESCRIPTION
IntroductionThe UBA2021 is an integrated circuit for electronically
ballasted compact fluorescent lamps and their derivatives
operating with mains voltages up to 240V (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
functionsfor the two discrete power MOSFETs,T1 andT2
(see Fig.7).
Initial start-upInitial start-upis achievedby 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) (thisis the voltage levelat 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.
OscillationWhen the low voltage supply (VVS) has reached the value VVS(start) the circuit starts oscillatingin 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 outof pin CF (mainly setby 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 periodsof exclusivelyT1or T2. Time
tno is dependent on the reference current IRREF.
Operation in the preheat modeThe 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 frequencyof 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
Philips Semiconductors Product specification
630 V driver IC for CFL and TL lamps UBA2021
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 downto the bottom frequencyfB (approximately 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.
Failure to ignite
Excessive current levels may occur if the lamp fails to
ignite. TheIC does not limit these currentsin any manner.
Transition to the burn state
Assuming that the lamp has ignited during the downward
frequency sweep,the frequency normally decreasesto the
bottom frequency. The IC can transit to the burn state in
two ways: In the event that the bottom frequencyis not reached,
transition is made after reaching the ignition time tign. As soon as the bottom frequency is reached.
The bottom frequency is determined by RRREF and CCF.
Feed-forward frequency
Above a defined voltage level the oscillation frequency
also depends on the supply voltage of the half-bridge
(see Fig.6). The currentfor the current-controlled oscillator
is in the feed-forward range derived from the current
through RRHV. The feed-forward frequencyis proportional the average valueof the current through RRHV within the
operating range of Ii(RHV), given the lower limit set byfB.
For currents beyond the operating range (i.e. between
1.0 and 1.6 mA) the feed-forward frequencyis clamped.In
orderto prevent feed-forwardof rippleon Vin, the rippleis
filtered out. The capacitor connectedto pin CPis usedfor
this purpose. Thispinis also usedin the preheat state and
the ignition state for timing (tph and tign).
Capacitive mode protection
When the preheat mode is completed, the IC will protect
the power circuit against losing the zero voltage switching
condition and getting too close to the capacitive mode of
operation. This is detected by monitoring voltage VRS at
pin RS. If the voltage is below VRS(cap) at the time of
turn-onof T2, thencapacitive mode operationis assumed.
Consequently the frequency increases as long as the
capacitive mode is detected. The frequency decreases
downto the feed-forward frequencyifno capacitive mode
is detected. Frequency modulation is achieved via pin CI.
Philips Semiconductors Product specification
630 V driver IC for CFL and TL lamps UBA2021
IC supply
Initially, the IC is supplied from Vin by the current through
RRHV. This current charges the supply capacitor CS9 via
an internal diode. As soon as VVS exceeds VVS(start), the
circuit starts oscillating. After the preheat phaseis finished,
pin RHV is connected to an internal resistor Ri(RHV); prior
to this, pin RHV is internally connected to pin VS. The
voltage level at pin RHV thus drops from VVS +Vdiode to
IRHV× Ri(RHV). The capacitor CS9 at pin VS will now be
charged via the snubber capacitor CS7. Excess chargeis
drained by an internal clamp that turns on at voltage
VVS(clamp).
Minimum gate-source voltage of T1 andT2
The high side driver is supplied via capacitor Cboot.
Capacitor Cbootis chargedvia the bootstrap switch during
the on-periodsof T2. TheIC stops oscillatingata voltage
level VVS(stop). Given a maximum charge consumption on
the loadatpin G1of1 nC/V, this safeguards the minimum
drive voltages V(G1−S1) for the high side driver; see
Table1.
Table 1 Minimum gate-source voltages
The drive voltageatG2 will exceed the drive voltageof the
high side driver.
Frequency and change in frequency
At any point in time during oscillation, the circuit will
operate betweenfB and fstart. Any changein frequency will
be gradual, no steps in frequency will occur. Changes in
frequency causedbya changein voltageat pinCI showa
rather-constantdf /dt over the entire frequency range. The
following rates are realised(ata frequencyof85 kHz and
with a 100 nF capacitor connected to pin CI): For any increase in frequency:df/dt is between and 37.5 kHz/ms During preheat and normal operation:df/dt for a
decrease in frequency is between−6 and −15 kHz/ms During the ignition phase:df/dt for a decrease in
frequency is between −150 and −375 Hz/ms.
Ground pins
Pin PGNDis the ground referenceof theIC with respectto
the application. As an exception, pin SGND provides a
local ground reference for the components connected to
pins CP, CI, RREF and CF. For this purpose pins PGND
and SGND are short-circuited internally. External
connectionof pins PGND and SGNDis not preferred. The
sumof currents flowing outof the pins CP,CI, RREF, CF
and SGND must remain zero at any time.
Charge coupling
Due to parasitic capacitive coupling to the high voltage
circuitry, all pins are burdened with a repetitive charge
injection. Given the typical applicationin Fig.7, pins RREF
and CF are sensitiveto this charge injection. For the rating
Qcouplea safe functional operationof theICis guaranteed,
independent of the current level. Charge coupling at
current levels below 50 μA will not interfere with the
accuracy of the VRS(cap) and VRS(ctrl) levels. Charge
coupling at current levels below 20 μA will not interfere
with the accuracy of any parameter.
Philips Semiconductors Product specification
630 V driver IC for CFL and TL lamps UBA2021
LIMITING VALUES
In accordance with the Absolute Maximum Rating System (IEC 60134); all voltages referenced to ground.
Notes Human body model:all pins are 3000V maximum, except pins FS, G1,S1 andVS which are 1500V maximum and
pin G2 which is 1000 V maximum. Machine model: all pins are 300 V maximum, except pin G2 which is 125 V maximum.
THERMAL CHARACTERISTICS
QUALITY SPECIFICATION
In accordance with “SNW-FQ-611-E”.
Philips Semiconductors Product specification
630 V driver IC for CFL and TL lamps UBA2021
CHARACTERISTICS
VVS =11V; VFS− VS1 =11V; Tamb =25 °C; all voltages referenced to ground; see Fig.7; unless otherwise specified.
Philips Semiconductors Product specification
630 V driver IC for CFL and TL lamps UBA2021
Notes The start-up supply current is specified in a temperature (Tvj) range of 0to 125 °C. For Tvj <0 and Tvj >125 °C the
start-up supply current is <350 μA. The clamp margin is defined as the voltage difference between turn-on of the clamp and start of oscillation. The
clamp is in the off-state at start of oscillation. Data sampling of VRS(ctrl) is performed at the end of conduction of T2. The total supply currentis specifiedina temperature (Tvj) rangeof −20to +125 °C. ForTvj< −20 andTvj >125°C the
total supply current is <1.5 mA. Data sampling of VRS(cap) is performed at the start of conduction of T2. Within the allowed range of RRREF, defined as 30 kΩ +10%. Typical values for the on and off resistances at Tvj= 87.5 °C are: RG2(on) and RG1(on)= 164 Ω, RG2(off) and
RG1(off)= 100Ω. The input currentat pin RHV may increaseto 1600μA during voltage transientat Vin. Onlyfor currents IRHV beyond
approximately 550 μA is the oscillator frequency proportional to IRHV. The symmetry SYMffis calculated from thequotient SYMff =T1tot/T2tot, with T1tot the time between turn-offof G2 and
turn-off of G1, and T2tot the time between turn-off of G1 and turn-off of G2.
