UBA3070

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.

Features

• Switch-mode buck controller that drives strings of LEDs up to 600 V power-efficiently
• Controller with power-efficient boundary conduction mode of operation:
  • No reverse recovery losses in freewheel diode
  • Zero current switching for turn-on of switch
  • Zero voltage or valley switching for turn-on of switch
  • Minimal required inductance value and size
• Direct Pulse Width Modulation (PWM) dimming available
• Fast transient response through cycle-by-cycle current control, thereby:
  • Preventing over or undershoots in the LED current
  • Enabling efficient PWM dimming by quickly turning the converter on and off and thereby removing the need for extra dim switches and high-side drivers
• Single loosely controlled input voltage required for all LED strings in RGB backlights
• No binning on LED forward voltage required
• Protections:
  • Undervoltage lockout
  • Leading edge blanking
  • Overcurrent
  • Overtemperature
• Low cost LED driver solution:
  • No Schottky diode required because of zero-current switching
  • No dim switch and high-side driver required for PWM dimming
  • Smaller inductor possible compared to fixed-frequency continuous conduction mode controllers

Products/packages

Pricing/ordering/availability

Applications

• The UBA3070 is typically suited as a high voltage LED backlighting application in LCD televisions and monitors (See Figure 1)

Block diagrams/pinning

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