Datasheet

UBA2071_A_1 © NXP B.V. 2008. All rights reserved.
Product data sheet Rev. 01 — 23 June 2008 27 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 low during 20 %
of each cycle and the lamps are on 20 % of the time, resulting in a light output of 20 %.
V
th(osp)(IFB)
open/short protection threshold
voltage on pin IFB
200 250 300 mV
V
th(ocd)(IFB)
overcurrent detection threshold
voltage on pin IFB
2.65 3.0 3.3 V
V
th(hsw)(SH)
hard switching threshold
voltage on pin SH
-56-V
I
dch(CVFB)
discharge current on pin CVFB hard switching detected;
V
CVFB
=2V
36 41 46 µA
V
th(det)arc(IFB)
arc detection threshold voltage
on pin IFB
-5-V
t
spike(min)
minimum spike time to active arcing protection - 200 - ns
t
d(o)fault
fault output delay time C
CT
= 100 nF 0.063 0.069 0.075 s
t
to(fault)
fault time-out time C
CT
= 100 nF 0.85 1.00 1.15 s
V
oc(NONFAULT)
open-circuit voltage on pin
NONFAULT
4.7 5.0 5.3 V
V
trig(I)NONFAULT
input trigger voltage on pin
NONFAULT
3.8 4.3 4.8 V
I
trig(I)NONFAULT
input trigger current on pin
NONFAULT
−32 −27 −22 µA
I
NONFAULT
current on pin NONFAULT V
NONFAULT
= 3 V −230 −195 −160 µA
I
sc(NONFAULT)
short circuit current on pin
NONFAULT
V
NONFAULT
= 0 V −260 −220 −180 µA
I
sink(NONFAULT)
sink current on pin NONFAULT V
NONFAULT
= 1 V 0.7 1 1.3 mA
Enable (EN pin)
V
th(H)2(EN)
HIGH-level threshold voltage 2
on pin EN
2.65 2.76 2.87 V
V
th(H)1(EN)
HIGH-level threshold voltage 1
on pin EN
- - 1.7 V
V
th(L)(EN)
LOW-level threshold voltage on
pin EN
0.9 - V
I
bias(EN)
bias current on pin EN 5 µA
Table 6. Characteristics
…continued
T
amb
=25 ° C; V
VDD
=12V; R
IREF
= 33 k 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. GL, GH,
COMM, NONFAULT and PWMD pins left open (unless otherwise specified). Currents are positive when flowing into the IC.
Parameters valid for all types (unless otherwise specified).
Symbol Parameter Conditions Min Typ Max Unit