UBA2074ATS datasheet(13/33 Pages) NXP

Part #	UBA2074ATS

Description	High Voltage Full-bridge control IC for CCFL backlighting

PDF	33 Pages

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Manufacturer	NXP [NXP Semiconductors]

Direct Link	http://www.nxp.com

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13 / 33 page

UBA2074(A)

Preliminary data sheet

Rev. 02.0 — February 2007

13 of 33

NXP Semiconductors

UBA2074(A)

High Voltage Full-bridge control IC for CCFL backlighting

The second way consists of interconnecting all inverters through the SYNC-pin, see

Figure 13. In this case all inverters will lock to the highest of the minimum switching

frequencies of all ICs in a PLL-type of way.

For both synchronisation methods the waveform of the voltage on the SYNC pins looks

like Figure 14 (tsync(period) = 1/Fsync).

Fig 12. HF synchronization of multiple inverters with an external SYNC-signal

Fig 13. HF synchronization of multiple inverters without an external SYNC-signal

Fig 14. SYNC-signal waveform (as seen on the SYNC-pin of an IC)

ext clk

IC1

IC2

ICn

SYNC

VDC

ext clk

IC1

IC2

ICn

SYNC

VDC

IC1

IC2

ICn

SYNC

IC1

IC2

ICn

SYNC

UBA2074ATS Datasheet(PDF) 13 Page - NXP Semiconductors