Datasheet

UBA2071_A_1 © NXP B.V. 2008. All rights reserved.
Product data sheet Rev. 01 — 23 June 2008 25 of 35
NXP Semiconductors
UBA2071; UBA2071A
Half bridge control IC for CCFL backlighting
V
clamp(VDD)
clamp voltage on pin VDD EN pin grounded; I
VDD
= 0.22 mA;
UBA2071T and UBA2071TS
13 13.35 13.7 V
EN pin grounded; I
VDD
= 3 mA;
UBA2071T and UBA2071TS
- - 14.0 V
I
VDD
current on pin VDD EN pin grounded; V
VDD
= 14.0 V;
UBA2071AT and UBA2071ATS
- - 0.22 mA
Ignition
f
sw(max)
/f
sw(min)
maximum switching frequency
to minimum switching
frequency ratio
2.2 2.4 2.6 kHz
V
CVFB(max)
maximum voltage on pin CVFB - 2.5 - V
I
ch(CVFB)
charge current on pin CVFB V
VFB
= 2 V; V
CVFB(max)
= 2 V −24 −21 −18 µA
V
th(lod)(IFB)
lamp on detection threshold
voltage on pin IFB
0.9 1.05 1.2 V
Normal operation
I
VDD
current on pin VDD oscillating at f
sw(min)
;
C
CF
= 100 pF
1.2 1.5 1.8 mA
disabled; V
VDD
= 11 V - 0.16 - mA
oscillating; CF = 100 pF;
GL and GH open
- 1.5 - mA
f
sw(min)
minimum switching frequency C
CF
= 100 pF
[1][2]
10 - 100 kHz
[1][2]
38 40 42 kHz
V
ref(creg)
current regulation reference
voltage
1.20 1.26 1.32 V
V
IFB(min)
minimum voltage on pin IFB for linear operating range - −2.5 - V
V
IFB(max)
maximum voltage on pin IFB for linear operating range - 2.5 - V
R
i(IFB)
input resistance on pin IFB V
IFB
= 1 V - 45 - kΩ
V
IFB
= −1 V - 24 - kΩ
g
m(OTA)
OTA transconductance 14 16.5 19 µA/V
Drivers
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
t
no
non-overlap time 1.1 1.3 1.5 µs
V
Fd(bs)
bootstrap diode forward
voltage
I
FS
= 5 mA 1.0 1.5 2.0 V
PWM dimming
I
VDD
current on pin VDD C
CF
= 100 pF; V
PWMD
=H;
V
CSWP
=0V
1.0 1.2 1.4 mA
t
d(en)PWM
PWM enable delay time 3 4 5 ms
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