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UBA2071ATS

更新时间： 2024-11-11 08:26:39

品牌	Logo	应用领域
恩智浦 - NXP		/
页数	文件大小	规格书
35页	578K
描述
Half bridge control IC for CCFL backlighting

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UBA2071ATS 数据手册

UBA2071; UBA2071A

Half bridge control IC for CCFL backlighting

Rev. 01 — 23 June 2008

Product data sheet

1. General description

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.

2. Features

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.

12 3 4 5 6 7...35

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