1.

General description

The UBA3070 driver IC is the first member of a first generation of power-efficient LED

backlight driver ICs. Highly efficient, flexible and reliable LED drivers can easily be

designed using the UBA3070 control IC.

2.

Features and benefits

Switch-mode buck controller that drives strings of LEDs up to 600 V power-efficiently

Controller with power-efficient Boundary Conduction Mode (BCM) operation:

Virtually no reverse recovery losses in freewheel diode

Zero Current Switching (ZCS) at switch, switch-on

Zero voltage or valley switching at switch, switch-on

Minimal required inductance value and size

Suitable for direct Pulse Width Modulation (PWM) dimming

Fast transient response through cycle-by-cycle current control, thereby:

Enabling efficient PWM dimming by quickly turning the converter on and off and

thus removing the need for extra dimming switches and high-side drivers

Single controlled input voltage required for all UBA3070 driven LED strings in RGB or

white backlighting units

No binning on LED forward voltage required

Protections:

UnderVoltage LockOut (UVLO)

Leading Edge Blanking (LEB)

OverCurrent Protection (OCP)

OverTemperature Protection (OTP)

Low cost LED driver solution:

No fast-switching Schottky diode required due to ZCS

No dimming switch or high-side driver required for PWM dimming

Operates with smaller inductor then a comparable fixed-frequency Continuous

Conduction Mode (CCM) controller

3.

Applications

The UBA3070 is suitable for high voltage LED lighting application:

LED backlighting in LCD televisions and monitors

General lighting applications

The UBA3070 application is most efficient when driving long LED strings

UBA3070

LED backlight driver IC

Rev. 3 — 9 December 2010

Product data sheet