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

of each cycle and the lamps are on 20 % of the time, resulting in a light output of 20 %.

open/short protection threshold

voltage on pin IFB

200

250

300

mV

overcurrent detection threshold

voltage on pin IFB

2.65

3.0

3.3

V

hard switching threshold

voltage on pin SH

-56

-

V

discharge current on pin CVFB hard switching detected;

36

41

46

µA

arc detection threshold voltage

on pin IFB

-5

-V

minimum spike time

to active arcing protection

-

200

-

ns

fault output delay time

0.063

0.069

0.075

s

fault time-out time

0.85

1.00

1.15

s

open-circuit voltage on pin

NONFAULT

4.7

5.0

5.3

V

input trigger voltage on pin

NONFAULT

3.8

4.3

4.8

V

input trigger current on pin

NONFAULT

−32

−27

−22

µA

current on pin NONFAULT

−230 −195 −160 µA

short circuit current on pin

NONFAULT

−260 −220 −180 µA

0.7

1

1.3

mA

Enable (EN pin)

HIGH-level threshold voltage 2

on pin EN

2.65

2.76

2.87

V

HIGH-level threshold voltage 1

on pin EN

-

-

1.7

V

LOW-level threshold voltage on

pin EN

0.9

-

V

bias current on pin EN

5

µA

Table 6.

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