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NXP Semiconductors - LED backlight driver IC

Numéro de référence UBA3070T
Description LED backlight driver IC
Fabricant NXP Semiconductors 
Logo NXP Semiconductors 





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UBA3070T fiche technique
UBA3070
LED backlight driver IC
Rev. 3 — 9 December 2010
Product data sheet
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:
‹ Preventing over or undershoots in the Light Emitting Diode (LED) current
‹ 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

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