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NXP Semiconductors Electronic Components Datasheet

UBA2071A Datasheet

Half bridge control IC

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UBA2071A pdf
UBA2071; UBA2071A
Half bridge control IC for CCFL backlighting
Rev. 01 — 23 June 2008
Product data sheet
1. General description
2. Features
The UBA2071 and UBA2071A are high voltage ICs intended to drive Cold Cathode
Fluorescent Lamps (CCFLs) or External Electrode Fluorescent Lamps (EEFLs) for
backlighting applications. They can drive a half bridge circuit made up of two NMOSFETs
with a supply voltage of up to 550 V, so the inverter can be supplied directly from a 400 V
PFC bus.
The UBA2071 and UBA2071A contain a controller, a level shifter, a bootstrap diode and
drivers for the external half bridge power switches. It also contains a low frequency PWM
generator, which can be used to control the brightness level of the lamps, using an analog
brightness/dimming control voltage. PWM dimming can also be realized, using a digital
PWM input signal. PWM dimming can be synchronized with other ICs. The lamp current is
controlled by means of a true zero voltage switching resonant control principle, ensuring
lowest possible switch losses in the half bridge power structure.
The UBA2071 is designed to be supplied by a V/t supply from the half bridge circuit that
it drives. The IC itself needs little current and if the IC is off, a clamp protects the supply
voltage from getting too high.
The UBA2071A is designed to be supplied by a fixed 12 V supply. It has a lower supply
start voltage and no supply clamp.
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I Suitable for operating in a very wide inverter supply voltage range (up to 550 V DC).
I Integrated level shifter.
I Integrated bootstrap diode.
I Lamp current control by means of a true zero voltage switching resonant control
principle.
I Sample & Hold circuit, maintaining current control value during PWM lamp-off
situation.
I Separately definable time constants for current control loop and PWM dimming
attack/decay setting.
I Overvoltage control.
I Overcurrent protection.
I Ignition failure detection.
I Hard switching control.
I Arcing detection.
I Open/short pin protections on feedback pins.
I Integrated, programmable fault timer.
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NXP Semiconductors Electronic Components Datasheet

UBA2071A Datasheet

Half bridge control IC

No Preview Available !

UBA2071A pdf
NXP Semiconductors
UBA2071; UBA2071A
Half bridge control IC for CCFL backlighting
I Bidirectional pin acting both as fault signaling output and input, allowing external fault
interfacing to operate via the integrated fault timer.
I Brightness level adjustment through PWM dimming.
I Integrated PWM generator.
I Power-down mode.
I Communication pin for master / slave operation.
I DC blocking capacitor pre-charging sequence.
I Supply clamp (UBA2071 only).
3. Applications
I 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.
Tamb = 25 °C; VVDD = 12 V; RIREF = 33 k; VEN = VVDD 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
VSH
VVDD
IVDD
voltage on pin SH
voltage on pin VDD
current on pin VDD
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EN pin grounded;
VVDD = 14.0 V;
UBA2071AT and
UBA2071ATS
- - 550 V
- - 14 V
- - 0.22 mA
oscillating at fsw(min);
CCF = 100 pF
disabled;
VVDD = 11 V
oscillating;
CF = 100 pF;
GL and GH open
1.2 1.5 1.8 mA
- 0.16 - mA
- 1.5 - mA
fsw(min)
minimum switching
frequency
CCF = 100 pF;
VPWMD = H;
VCSWP = 0 V
CCF = 100 pF
1.0 1.2 1.4 mA
[1] 10
[2]
-
100 kHz
[1] 38 40 42 kHz
[2]
fsw(max)/fsw(min)
maximum switching
frequency to
minimum switching
frequency ratio
Vref(creg)
current regulation
reference voltage
2.2 2.4 2.6 kHz
1.20 1.26 1.32 V
UBA2071_A_1
Product data sheet
Rev. 01 — 23 June 2008
© NXP B.V. 2008. All rights reserved.
2 of 35
datasheet pdf - http://www.DataSheet4U.net/


Part Number UBA2071A
Description Half bridge control IC
Maker NXP Semiconductors
Total Page 30 Pages
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