NXP公司的UBA20261/2是高压功率集成电路,用来驱动和控制大功率自镇流的紧凑型荧光灯(CFL)照明,可工作在火线电压120VAC或230VAC.器件包括两个NMOST功率MOSFET组成的半桥电路(350V/5A或600V/2.7A),用来调光的电流和用来点燃冷(汞合金)CFL灯的电流控制电路.本文介绍了UBA20261/2主要特性和优势,方框图, 基本应用电路图和UBA20261/2演示板主要指标,电路图,材料清单和PCB布局图.

UBA20261/2:600 V and 350 V power IC for step dimmable CFLs

The UBA20261/2 are high-voltage power integrated circuits designed to drive and control high powered self-ballasted Compact Fluorescent Lamp (CFL) lighting applications operating at mains supply voltages of 120 V or 230 V. The IC includes a half-bridge power circuit consisting of two NMOST power MOSFETs, an advanced feature for step dimming and a lamp current controlled boost feature for boosting cold (amalgam) CFLs.

The controller contains a CFL half-bridge drive function, a high-voltage level-shift circuit with integrated bootstrap diode, an oscillator function, a current control function for preheat and burn, a timer function and protection circuits. The UBA20261/2 are supplied using the dV/dt current charge supply circuit from the half-bridge circuit.

UBA20261/2主要特性和优势:

半桥特性:

 UBA20261: two internal 350 V, 1ohm, maximum 5 A NMOST half-bridge power MOSFETs

 UBA20262: two internal 600 V, 3 ohm, maximum 2.7 A NMOST half-bridge power MOSFETs

 Integrated high-voltage level-shifter function with integrated bootstrap diode

预热和点燃特性:

 Coil saturation protection during ignition

 Adjustable saturation protection level

 Adjustable preheat time

 Adjustable preheat current

 Ignition lamp current detection

灯提升特性:

 Adjustable boost timing

 Fixed boost current ratio of 1.5

 Gradually boost to burn transition timing

调光特性:

 4-level step dimming adjustment using a standard on/off mains switch

 Adjustable memory retention time for step dimming

 Adjustable minimum dimming level

保护特性:

 OverTemperature Protection (OTP)

 Capacitive Mode Protection (CMP)

 OverPower Protection (OPP)

 OverCurrent Protection (OCP) in both boost and burn states

 Power-down function

其它特性:

 Current controlled operation in both boost and burn state

 External power-down option

UBA20261/2应用:

 UBA20261: Step-dimmable compact fluorescent lamps at power levels between 5 W and 20 W operating at 120 V mains voltage

 UBA20262: Step-dimmable compact fluorescent lamps at power levels between 5 W and 20 W operating at 230 V mains voltage

图1. UBA20261/2方框图



图2. UBA20261/2基本应用电路图
230VAC应用的典型元件表:


采用UBA20261/2的230VAC和120VAC的参考设计

The UBA20261/2 demo board is not recommended for driving lower voltage linear lighting lamps like the T5 or the T8. For these types of lamps the UBA2014, UBA2021 or UBA2016 are the best options.

The IC is able to drive lamps up to 20 W provided the maximum junction temperature of the IC is not exceeded. There are no THD-requirements for mains powers lower than 25 W so that a pre-conditioner function is obsolete.

The circuit is set up to perform a preheat so the lamp switches on approximately 1 s after mains is applied to the board. Lamp current boost value is approximately 1.5. For detailed design steps, on the 18 W lamp solution or how to setup lamps with other power ratings.

The mains voltage operating range is either set for 90 V to 130 V or 200 V to 250 V (RMS)depending on the board ordered.

The ICs are intended as cost-effective step-dimmable solutions to drive CFL with an integrated ballast (CFLi). Therefore, the ICs are equipped with a thermal, coil saturation,over-power and OverCurrent Protection (OCP) and a lamp strike failure time-out.

图3.UBA20261 (120 V) 演示板外形图

图4.UBA20262 (230 V) 演示板外形图

UBA20261/2演示板主要指标:

The UBA20261/2 demo board is set up to drive a typical 18 W burner. The specification
for each type is as follows:

UBA20262 (230 V):

• Input voltage range: 230 V; 15 %; 50 Hz
• Input power: 18 W at 230 V
• Input current: 159 mA/208 mA (boost)
• Power Factor (PF): > 0.55
• Running frequency 44.5 kHz; start frequency 111 kHz
• Preheat: 0.7 s
• 1.5  lamp current boost, set for 50 s

UBA20261 (120 V):

• Input voltage range: 120 V; 15 %; 60 Hz
• Input power: 18 W at 120 V
• Input current: 288 mA/385 mA (boost)
• Power Factor (PF): 0.55
• Running frequency 44.5 kHz; start frequency 111 kHz
• Preheat: 0.7 s
• 1.5  lamp current boost, set for 50 s

Protective functions:

• Coil saturation set to:
– UBA20262: 2.3 A at 230 V
– UBA20261: 2.8 A for 120 V
• OverCurrent Protection (OCP) set to:
– UBA20262: 2.3 A for 230 V
– UBA20261: 2.8 A for 120 V
• Capacitive Mode Protection (CMP)
• OverTemperature Protection (OTP)
• OverPower Protection (OPP)

Burners:

• UBA20261: typical burner with a lamp voltage of 110 V (±10 %) and a lamp current of
120 mA (±10 %). Conditions set by resistors R30 and R33
• UBA20262: typical burner with a lamp voltage of 95 V (±10 %) and a lamp current of
120 mA (±10 %). Conditions set by resistors R31 and R32

图5.UBA20261/2演示板电路图
UBA20261 (120 V)和UBA20262 (230 V)演示板共同材料清单(BOM):


UBA20261 (120 V)演示板附加BOM:

UBA20262 (230 V)演示板附加BOM:
 

图6.UBA20261/2演示板PCB布局图:顶层

图7.UBA20261/2演示板PCB布局图:底层
详情请见:
http://www.nxp.com/documents/data_sheet/UBA20261_UBA20262.pdf
和
http://www.nxp.com/documents/user_manual/UM10498.pdf