Datasheet

UBA2071_A_1 © NXP B.V. 2008. All rights reserved.
Product data sheet Rev. 01 — 23 June 2008 2 of 35
NXP Semiconductors
UBA2071; UBA2071A
Half bridge control IC for CCFL backlighting
n Bidirectional pin acting both as fault signaling output and input, allowing external fault
interfacing to operate via the integrated fault timer.
n Brightness level adjustment through PWM dimming.
n Integrated PWM generator.
n Power-down mode.
n Communication pin for master / slave operation.
n DC blocking capacitor pre-charging sequence.
n Supply clamp (UBA2071 only).
3. Applications
n 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).
4. Quick reference data
Table 1. Quick reference data.
T
amb
=25 ° C; V
VDD
=12V;R
IREF
=33k Ω ;V
EN
=V
VDD
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
V
SH
voltage on pin SH - - 550 V
V
VDD
voltage on pin VDD - - 14 V
I
VDD
current on pin VDD EN pin grounded;
V
VDD
= 14.0 V;
UBA2071AT and
UBA2071ATS
- - 0.22 mA
oscillating at f
sw(min)
;
C
CF
= 100 pF
1.2 1.5 1.8 mA
disabled;
V
VDD
=11V
- 0.16 - mA
oscillating;
CF = 100 pF;
GL and GH open
- 1.5 - mA
C
CF
= 100 pF;
V
PWMD
=H;
V
CSWP
=0V
1.0 1.2 1.4 mA
f
sw(min)
minimum switching
frequency
C
CF
= 100 pF
[1]
[2]
10 - 100 kHz
[1]
[2]
38 40 42 kHz
f
sw(max)
/f
sw(min)
maximum switching
frequency to
minimum switching
frequency ratio
2.2 2.4 2.6 kHz
V
ref(creg)
current regulation
reference voltage
1.20 1.26 1.32 V