UBA2072_5 datasheet(5/28 Pages) PHILIPS

Part #	UBA2072

Description	Low Voltage Full-bridge control IC for CCFL backlighting

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Manufacturer	PHILIPS [NXP Semiconductors]

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UBA2072

Preliminary data sheet

Rev. 08.0 — February 2007

5 of 28

NXP Semiconductors

UBA2072

Low Voltage Full-bridge control IC for CCFL backlighting

7.

Functional description

The UBA2072 is designed to drive a full-bridge inverter with resonant load. The load

consists typically of transformers with CCFLs. Two parameters are used by the UBA2072

to control the switches of the full-bridge inverter: the phase shift and the switching

frequency.

The two full bridge halves A and B (Figure 3) always operate at the same switching

frequency. The frequency is used to control transformer output voltage during the ﬁrst

ignition of the lamps. The phase difference between the full-bridge halves A and B

voltages (VA and VB) controls the lamp current, as this determines the rms value of the

full-bridge inverter voltage VA - VB (Figure 4).

Fig 3.

Full-bridge inverter deﬁnition

Fig 4.

Full-bridge inverter voltage and deﬁnition of phase shift

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