Datasheet

UBA2071_A_1 © NXP B.V. 2008. All rights reserved.
Product data sheet Rev. 01 — 23 June 2008 3 of 35
NXP Semiconductors
UBA2071; UBA2071A
Half bridge control IC for CCFL backlighting
[1] Given frequency is switching frequency of GL and GH. Sawtooth frequency on CF pin is twice as high.
[2] Can be set by external capacitor
[3] PWMD is active low: A low level on the PWMD pin corresponds with lamps-on. Example: δ
PWM
= 20 %
means PWMD is during 20 % of each cycle low and the lamps are 20 % of the time on, resulting in a light
output of 20 %.
5. Ordering information
V
th(ov)(VFB)
overvoltage
threshold voltage on
pin VFB
2.40 2.50 2.60 V
t
to(fault)
fault time-out time C
CT
= 100 nF 0.85 1.00 1.15 s
I
source(drv)
driver source
current
V
GL
, V
GH
= 4 V;
V
VDD
=V
FS
=12V
−105 −90 −75 mA
R
sink(drv)
driver sink
resistance
V
GL
, V
GH
= 2 V;
V
VDD
=V
FS
=12V
13.5 16.0 18.5 Ω
f
PWM
PWM frequency
[1]
75 - 1000 Hz
δ
PWMD
duty cycle on pin
PWMD
[3]
12 - 100 %
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
Table 2. Ordering information
Type number Package
Name Description Version
UBA2071T SO24 plastic small outline package; 24 leads; body width 7.5 mm SOT137-1
UBA2071AT SO24 plastic small outline package; 24 leads; body width 7.5 mm SOT137-1
UBA2071TS SSOP24 plastic shrink small outline package; 24 leads;
body width 5.3 mm
SOT340-1
UBA2071ATS SSOP24 plastic shrink small outline package; 24 leads;
body width 5.3 mm
SOT340-1