NXP UBA20270

Description

The UBA20270 is a high-voltage power IC intended to control higher powered self ballasted Compact Fluorescent Lamp (CFL) lighting applications. The UBA20270 is a controller circuit with advanced features for dimming and has a lamp current controlled boost feature for boosting cold (amalgam) CFLs.The controller contains a half-bridge drive function for CFL, a high-voltage level-shift circuit with integrated bootstrap diode. In addition, the controller contains an oscillator function, a current control function both for preheat and burn, a timer function and protection circuits. The UBA20270 is supplied via a dV/dt current charge supply circuit from the half-bridge circuit.

Features

• 2.1Half-bridge features
• Integrated high-voltage level-shift function with integrated bootstrap diode
• 2.2Preheat and ignition features
• Coil saturation protection during ignition
• Adjustable preheat time
• Adjustable preheat current
• Ignition lamp current detection
• 2.3Lamp boost features
• Adjustable boost timing
• Fixed boost current ratio of 1.5
• Gradually boost to burn transition timing
• 2.4Dim features
• Continuously variable dimming function for standard phase cut dimmers
• Natural dimming curve by logarithmic correction
• Adjustable Minimum Dimming Level (MDL)
• Controlled lamp ON/OFF
• 2.5Protection
• OverCurrent Protection (OCP) in boost and burn state
• Capacitive Mode Protection (CMP)
• OverPower Protection (OPP)
• Power-down function
• OverTemperature Protection (OTP)
• 2.6Other features
• Current controlled operating in boost and burn state
• External power-down function
• Lamp flicker suppression-Input filter inductor 4.7mH

Typical applications

• Dimmable compact fluorescent lamps for power levels above 20 W and for universal mains voltages.

More information

• Datasheet
• IC product information