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UBA2024P Datasheet(PDF) 4 Page - NXP Semiconductors |
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UBA2024P Datasheet(HTML) 4 Page - NXP Semiconductors |
4 / 12 page UBA2024_3 © NXP B.V. 2008. All rights reserved. Product data sheet Rev. 03 — 16 October 2008 4 of 12 NXP Semiconductors UBA2024 Half-bridge power IC for CFL lamps When entering the sweep mode, the oscillator starts at 2.5 times the nominal bridge frequency and sweeps down to the nominal bridge frequency fnom; see Figure 4. During this continuously decreasing of the frequency, the circuit approaches the resonance frequency of the load. This causes a high voltage across the load, which ignites the lamp. The sweep time tsweep is determined by the charge current Ich(sw) and the external capacitor CSW. The sweep to resonance time should be much larger than the settling time of the supply voltage on pin HV to guarantee that the full high-voltage is present at the moment of ignition. The amplitude of the RC oscillator is equal to the minimum value of VRC(h) and VSW + 0.4 × VRC(h). During the sweep time a current is flowing through the lamp electrodes for preheating the filaments. Fig 3. Oscillator, drivers and output signals time VRC VOUT 0 HS drive LS drive 0 0 half bridge 0 time time time 014aaa658 |
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