No Longer Manufactured
UBA20270T

UBA20270T: Dimmable controller IC for CFL ARCHIVED

Overview

Archived content is no longer updated and is made available for historical reference only.

The UBA20270 is a high voltage IC, to be used with two external NMOS power FETs, intended to control high power self ballasted dimmable Compact Fluorescent Lamps (CFL). The UBA20270 has advanced features for dimming and a lamp current controlled boost feature for boosting cold (amalgam) CFL lamps. The controller contains a half-bridge drive function, including a high voltage level-shift circuit with integrated bootstrap diode, an oscillator function, a current control function both for preheat and burn, timer function and protection circuits. The UBA20270 is supplied via a high-efficient dV/dt supply circuit.

Features

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

Target Applications

Dimmable compact fluorescent lamps above 20 W and for universal mains voltages

Features

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

Target Applications

Dimmable compact fluorescent lamps above 20 W and for universal mains voltages

Application Notes

UBA20270 Block Diagram

SOT109-3 (SO16)

SOT109-3 (SO16)

UBA20270 Block Diagram
SOT109-3 (SO16)

UBA20270 Block Diagram

SOT109-3 (SO16)

SOT109-3 (SO16)

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