PDF UBA2021 Data sheet ( Hoja de datos )

Número de pieza	UBA2021
Descripción	630 V driver IC for CFL and TL lamps
Fabricantes	NXP Semiconductors
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No Preview Available ! UBA2021 630 V driver IC for CFL and TL lamps Rev. 04 — 25 July 2008 Product data sheet 1. General description The 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. 2. Features I Adjustable preheat and ignition time. I Adjustable preheat current. I Adjustable lamp power. I Lamp power independent from mains voltage variations. I Overpower protection. I Lamp temperature stress protection at higher mains voltages. I Capacitive mode protection. I Protection against a drive voltage that is too low for the power MOSFETs. 3. Quick reference data Table 1. Quick reference data Symbol Parameter High voltage supply VFS high side supply voltage Start-up state VVS(start) oscillator start voltage VVS(stop) oscillator stop voltage IVS(standby) standby current Preheat mode fstart start frequency tph preheat time VRS(ctrl) control voltage at pin RS Frequency sweep to ignition fB bottom frequency tign ignition time Normal operation fB bottom frequency tno non-overlap time Conditions IFS < 15 µA; t < 0.5 s VVS = 11 V CCP = 100 nF Min Typ Max Unit -- 630 V - 11.95 - - 10.15 - - 200 - V V µA - 108 - - 666 - - −600 - kHz ms mV - 42.9 - - 625 - kHz ms - 42.9 - - 1.4 - kHz µs 1 page NXP Semiconductors UBA2021 630 V driver IC for CFL and TL lamps fstart fB preheat state Fig 5. Operation in the preheat mode ignition state burn state time mgs992 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 UBA2021_4 Product data sheet Rev. 04 — 25 July 2008 © NXP B.V. 2008. All rights reserved. 5 of 16 5 Page NXP Semiconductors UBA2021 630 V driver IC for CFL and TL lamps • Where: • fB = bottom frequency. • fff = feed-forward frequency. • fcm = frequency due to capacitive mode detection. • Preheat time: t ph = 1----5C---0-C--n-P--F-- × -R3---0-R--K-R---E-Ω--F- • Ignition time: tign = 11----56- × t ph • Non-overlap time: tno = 1.4µs × -R-3---R0---Rk---EΩ---F- 12. Application information L1 DS1 R1 mains supply DS2 C3 C2 DS3 DS4 C4 Fig 7. Application diagram lamp Vin T1 L2 C5 T2 Rshunt RRHV 490 kΩ G1 2 S1 3 100 nF CS7 FS Cboot 1 DS7 CS4 DS6 G2 6 VS 5 CS9 RHV 13 14 CI CCI 100 nF 8 CP UBA2021 12 CF CCP 100 nF CCF 100 pF 10 RREF RRREF 30 kΩ SGND 7 9 11 PGND RS mgs994 UBA2021_4 Product data sheet Rev. 04 — 25 July 2008 © NXP B.V. 2008. All rights reserved. 11 of 16 11 Page

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