UBA2071ATS datasheet(2/35 Pages) NXP

2 / 35 page

UBA2071_A_1

Product data sheet

Rev. 01 — 23 June 2008

2 of 35

NXP Semiconductors

UBA2071; UBA2071A

Half bridge control IC for CCFL backlighting

I Bidirectional pin acting both as fault signaling output and input, allowing external fault

interfacing to operate via the integrated fault timer.

I Brightness level adjustment through PWM dimming.

I Integrated PWM generator.

I Power-down mode.

I Communication pin for master / slave operation.

I DC blocking capacitor pre-charging sequence.

I Supply clamp (UBA2071 only).

Applications

I LCD-backlighting, including LCD-TV and LCD-monitor applications. The IC is intended

to drive and control a half bridge inverter with resonant load circuit for CCFLs, but can

also drive an array of External Electrode Fluorescent Lamps (EEFLs).

Quick reference data

Table 1.

Quick reference data.

Tamb =25 °C; VVDD =12V; RIREF =33kΩ;VEN =VVDD and CPWM connected to a capacitor, unless

otherwise speciﬁed. All voltages are measured with respect to signal ground (SGND, pin 10). SGND

and PGND connected together. Currents are positive when ﬂowing into the IC.

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

VSH

voltage on pin SH

550

VVDD

voltage on pin VDD

IVDD

current on pin VDD

EN pin grounded;

VVDD = 14.0 V;

UBA2071AT and

UBA2071ATS

0.22

oscillating at fsw(min);

CCF = 100 pF

1.2

1.5

1.8

disabled;

VVDD =11V

0.16

oscillating;

CF = 100 pF;

GL and GH open

1.5

CCF = 100 pF;

VPWMD =H;

VCSWP =0V

1.0

1.2

1.4

fsw(min)

minimum switching

frequency

CCF = 100 pF

[1]

[2]

100

kHz

[1]

[2]

kHz

fsw(max)/fsw(min) maximum switching

frequency to

minimum switching

frequency ratio

2.2

2.4

2.6

kHz

Vref(creg)

current regulation

reference voltage

1.20

1.26

1.32

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