UBA2024 データシートの表示（PDF） - Philips Electronics

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UBA2024

Half-bridge power IC for CFL lamps

Philips Electronics 

NXP Semiconductors

UBA2024

Half-bridge power IC for CFL lamps

VRC

0

time

HS

drive

0

time

LS

drive

0

time

VOUT

half

bridge

0

time

014aaa658

Fig 4. Oscillator, drivers and output signals

When entering the sweep mode (VSW = 0 V), the bridge oscillator starts at 2.5 times the

nominal bridge frequency and sweeps down to the nominal frequency (bridge), set by

ROSC and COSC. During the sweep mode the amplitude of the RC oscillator on pin RC, will

swing between Vtrip(osc)low and VSW + 0.4Vtrip(osc)high. The amplitude of the RC oscillator

will continue to increase until VSW + 0.4Vtrip(osc)high = Vtrip(osc)high, this determines the end

of the sweep time. The voltage on pin SW however will continue to rise until it reaches

supply voltage level.

During this continuous decrease in frequency, the circuit approaches the resonance

frequency of the load, and this causes a high voltage across the load, which ignites the

lamp. 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. See Figure 5.

UBA2024

Product data sheet

All information provided in this document is subject to legal disclaimers.

Rev. 6.2 — 1 November 2010

© NXP B.V. 2010. All rights reserved.

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