TRAD applications with UBA2024T applications with UBA2024T
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applications with UBA2024T
TRAD
applications with UBA2024T
applications with UBA2024T
Author(s):
Joost Bongers, Arjan Berg, Verhoeven Philips Semiconductors, Standard Analogue Business line, Nijmegen, Netherlands
Keywords:
Compact Fluorescent Lamp Quasi preheat UBA2024T Integrated half bridge driver Silicon Insulator
Date: 2003-August-25
applications with UBA2024T
INTRODUCTION.4 FEATURES Application photos Circuit Diagram.6 SELECTING COMPONENT VALUES.7 Selecting input configuration, buffer capacitor fuse-resistor.7 Choosing frequency, lamp inductor lamp capacitor.7 Ignition frequency preheating.9 Choosing other components.9 About component tolerances
EXAMPLES CALCULATING COMPONENT VALUES EXAMPLE lamp (2.5W/90mA burner) Determining component values 115V/60Hz mains. Determining component values 230V/50Hz mains. EXAMPLE lamp (12W/150mA burner, suited cold ignition).12 Determining component values 115V/60Hz mains. Determining component values 230V/50Hz mains. Some other examples lamp (7W/150mA burner, suited cold ignition) (fout =46kHz) lamp (9.5W/150mA burner, suited cold ignition) (fout =42.5kHz). lamp (11W/125mA burner, needing warm ignition) (fout =42.5kHz). lamp (12.5W/180mA burner, suited cold ignition) (fout =40kHz). DEMO BOARD LAMP
QUICK MEASUREMENTS APPENDIX Application board layout mple
applications with UBA2024T
INTRODUCTION
UBA2024T integrated half bridge power designed integrated sealed Compact Fluorescent Lamp (CFL) with lamp current 150mA. Typical input voltages 100-127Vac 220-240Vac. Output power varies from 15W, depending lamp input voltage. UBA2024T high voltage (550V) monolithic integrated circuit made EZ-HV process. includes both half bridge power transistors with level-shifter drivers, boots trap circuitry, internal power supply, precision oscillator start-up frequency sweep function soft-start and/or pre-heating. mounted dedicated SO14 (Small Outline) package with optimised heat transfer. high level integration, only external components needed when building lamp ballast with UBA2024T. This application note will give descriptions typical integrated applications range. (See datasheet functional description UBA2024T)
FEATURES
based upon EZ-HV (silicon insulator) technology integrated half bridge power-IC applications (both powers controller) accurate oscillator with adjustable frequency Soft start frequency sweep down from start frequency Quasi preheat option larger sweep down timing) Allows very compact integrated lamp ballast which fits small shell cost Compact Fluorescent Lamp applications component count Easy applicable withstand 550V maximum voltage surge
applications with UBA2024T
APPLICATION PHOTOS
Figure Photos Compact Fluorescent Lamp with UBA2024T
applications with UBA2024T
CIRCUIT DIAGRAM
D1.2
LFILT
RFUS
100-127V 50/60Hz
UBA2024
CBUF1 CHB2
ROSC
PGND SGND
CBUF2 CHB1
CVDD COSC
Figure Schematic Compact Fluorescent Lamp application using UBA2024T with voltage doubler input
D1.4
LFILT
RFUS
100-240V 50/60Hz
UBA2024
CBUF CHB2
ROSC
PGND SGND
CVDD COSC
CHB1
Figure Schematic standard Compact Fluorescent Lamp application using UBA2024T
PINNING SO14 SYMBOL DESCRIPTION SGND signal ground SGND signal ground SGND signal ground high voltage supply SGND signal ground internal voltage supply input internal oscillator
SYMBOL SGND SGND PGND SGND
DESCRIPTION input sweep timing signal ground signal ground floating supply high side power ground signal ground half bridge output
applications with UBA2024T
SELECTING COMPONENT VALUES Selecting input configuration, buffer capacitor fuse-resistor
voltage doubler (figure standard bridge rectifier (figure values buffer capacitor BUF) fusible inrush-current limiting resistor given table
Table Adviced input configuration, buffer capacitor fusible inrush-current limiting resistor
Input Voltage Lamp Power# Input configuration BUF1, BUF2 (each) 100-127Vac (n.a.) 10µF/200V Standard (fig. 100-127Vac 5-6W (n.a.) 15µF/200V 100-127Vac 7-8W (n.a.) 10µF/200V Voltage Doubler 100-127Vac (n.a.) 15µF/200V (fig.3) 100-127Vac (n.a.) 22µF/200V 220-240Vac (n.a.) 2.2µF/400V 220-240Vac 6-8W (n.a.) 3.3µF/400V Standard (fig. 220-240Vac (n.a.) 4.7µF/385V 220-240Vac (n.a.) 6.8µF/385V Overall lamp power including driver circuit) Minimum continuous power rating minimum peak power rating (20ms)) (0.25W/23W)* (0.5W/35W)* (0.5W/47W)* (0.75W/70W)* (1W/103W)* (0.25W/23W)* (0.25W/23W)* (0.5W/32W)* (0.5W/47W)*
Choosing frequency, lamp inductor lamp capacitor
Given certain netto lamp power Plamp lamp current Ilamp, then Vlamp=Plamp/Ilamp. buffer capacitors according table approximation effective lamp inductor voltage VLla_eff given2 table
Table Approximated effective lamp inductor voltage
Input frequency Input V_lamp Voltage configuration n.a. n.a. Standard n.a. (fig. n.a. Voltage Doubler (fig.3) Standard (fig. n.a.= applicable (these combinations lamp voltage input voltage/configuration allowed) n.a. n.a. n.a. 100V n.a. n.a. n.a. n.a.
lamp inductor lamp frequency fout have comply
fout
VLla_eff Ilamp
burner only, usually about overall lamp power. linear interpolation find values inbetween.
VLla_eff
applications with UBA2024T
fout chosen freely 60kHz (the maximum nominal output frequency UBA2024, corresponding with start-up frequency 150kHz, datasheet start-up sequence description). However, usually fout chosen between 25kHz 30kHz between 40kHz 50kHz. This because below 25kHz there audible noise, operation 30kHz 40kHz band result interference with infra-red remote control above 50kHz third harmonic range where conducted noise requirements most countries have met. Since inductors capacitors decrease size cost with increase frequency, 50kHz range preferred. Throughout this application note will presume lamp frequency will this range. fout ROSC COSC according following formula:
fout
kOSC ROSC COSC
Practical values ROSC range from 400k. Note that values ROSC will cause larger output current, thus increasing total package dissipation. Practical values range from 100pF 1nF. Advised value 180pF 40.50kHz 270pF 25.30kHz. oscillator constant kOSC shown figure
Figure Typical kosc dependency Rosc Cosc UBA2024T.
applications with UBA2024T
Ignition frequency preheating
starts output frequency about times nominal output frequency, gradually decreases this until nominal output frequency reached. lamp inductor lamp capacitor will boost lamp voltage gradually higher output frequency gets closer their resonance frequency, until sufficient ignite lamp. mean time current resonance circuit flows through filaments thereby providing some preheating. UBA2024 circuit that stops frequency sweep resonance frequency lamp ignited (see UBA2024 specifications details). This ensures maximum effort ignite lamp. ignition frequency fign higher than equal resonance frequency (fres=1/(2(L LA)) resonance frequency should choosen that 1.6fout fres1.8fout time needed sweep down (set from start frequency fres used approximation ignition time. It's about 0.5s/100nF. large values ignition time shorter, because lamp ignites before resonance frequency reached. Typical ignition time when CSW=330nF. determines sweep time. larger longer sweep time better preheating electrodes. However, rise pre-ignition lamp voltage also slower. Both short preheat well slow voltage rise increase glow time lamp (that's when lamp fully ignited, it's anymore either), which decreases lamp life time. best preheat time strongly depends lamp. Typical values 33nF 330nF.
Choosing other components
D1.D4 plain cost 1N4007 diodes used. lamp current 150mA CDV=220pF, lower currents CDV=100pF. values CVDD FS=CVDD=10nF. Advised half bridge capacitors CHB2) >47nF when fout= 40-50kHz >68nF when fout= 25-30 kHz. resonance frequency input filter, consisting LFILT being effective capacitor seen i.e. series capacitance CHB1 HB2), least times lower than nominal output frequency.
Note: Performance lifetime guaranteed using values given this chapter only. Lamp UBA2024 performance strongly interact with each other need qualified together combination.
About component tolerances
components, generally used tolerances used (20% electrolytic capacitors, other capacitors (foil ceramic) resistors inductors). Since ROSC COSC determine lamp current, their tolerance also determines spread lamp current. Therefore, required lamp current accuracy require closer tolerance ROSC COSC LLA. Example ROSC ±5%, COSC ±10%, ±5%, ±10% IC's internal frequency then lamp current tolerance 12.6% effective
Valid component values with normal distribution.
applications with UBA2024T
Example ROSC ±1%, COSC ±5%, ±5%, IC's internal frequency then lamp current tolerance 7.1% effective.
applications with UBA2024T
EXAMPLES CALCULATING COMPONENT VALUES EXAMPLE lamp (2.5W/90mA burner)
Determining component values 115V/60Hz mains
From table Standard configuration, CBUF=10µF, RFUS=18. Vlamp2.5/0.09028V. From table Effective lamp coil voltage VLla_eff 68V. LA=3.9mH output frequency must fout =68/(0.0903.910-32)=30.8kHz choose COSC =270pF, then ROSC =1/(1.0730.8103 27010-12 )=112k. stay below 30kHz within E24range choose 120k, only E12-range value resulting fign/fout between 2.7nF ign/fout 1.70). Warm ignition. CSW=220nF. D1.D 4=BYD13M (=1N4007 equivalent, smaller), CFS=10nF, CVDD=10nF CDV=100pF (see section 6.4). HB1=CHB2=33nF (see section 6.4). LFILT choosen 4.7mH.
Determining component values 230V/50Hz mains
From table Standard configuration, CBUF=2.2µF, RFUS=47. Vlamp2.5/0.09028V. From table Effective lamp coil voltage VLla_eff 143V. LLA=8.2 output frequency must fout =143/(0.0908.210-32)=30.8kHz choose COSC =270pF, then ROSC =1/(1.0730.8103 27010-12 )=112k. stay below 30kHz within E24range choose 120k, only E6-range value resulting fign/fout between 1.0nF ign/fout 1.76). Warm ignition: CSW=220nF. D1.D 4=BYD13M (=1N4007 equivalent, smaller), CFS=10nF, CVDD=10nF CDV=100pF (see section 6.4). HB1=CHB2=47nF (see section 6.4). LFILT choosen 4.7mH.
RFUS D1.D4 CBUF LFILT CHB1, CVDD COSC ROSC DESCRIPTION Fusible inrush current limiter resistor Bridge rectifier diodes Buffer capacitor Filter inductor Half bridge capacitors Lamp capacitor Lamp inductor dV/dt limiting capacitor Floating Supply buffer capacitor voltage supply buffer capacitor Oscillator capacitor Oscillator resistor Sweep time capacitor REMARKS 115V/60HZ Special type, fusible, high peak power BYD13M High temperature electrolytic type 10µF/200V Axial type 4.7mH 47nF/200V Foil type 2.7nF/1kV BC7/12-Core (illustration side) 3.9mH. 100pF/500V 10nF/50V 10nF/50V 270pF/50V 120k/1/8W 220nF/16V 230V/50Hz BYD13M 2.2µF/400V 4.7mH 47nF/200V 1.0nF/1kV 8.2mH 100pF/500V 10nF/50V 10nF/50V 270pF/50V 120k/1/8W 220nF/16V
applications with UBA2024T
EXAMPLE lamp (12W/150mA burner, suited cold ignition)
Determining component values 115V/60Hz mains
From table Voltage doubler configuration, CBUF1=CBUF2=22µF, RFUS=6.8 Vlamp12/0.150=80V. From table Effective lamp coil voltage VLla_eff 122V. LA=3.1mH output frequency must fout =122/(0.1503.110-32)=41.8kHz. choose COSC =180pF, then ROSC =1/(1.0941.8103 18010-12 )=122k. stay within E24-range choose 120k, only E6-range value resulting fign/fout between 1.5nF ign/fout 1.74). This burner suited cold ignition: CSW=100nF (see paragraph 5.3) D1=D2=1N4007, FS=10nF, CVDD=10nF DV=220pF (see section 6.4). HB1=CHB2=47nF (see section 6.4). LFILT choosen 2.7mH.
Determining component values 230V/50Hz mains
From table Standard configuration, CBUF=6.8µF, RFUS=27 Vlamp12/0.150=80V. From table Effective lamp coil voltage VLla_eff 122V. LA=3.1mH output frequency must fout =122/(0.1503.110-32)=41.8kHz. choose COSC =180pF, then ROSC =1/(1.0941.8103 18010-12 )=122k. stay within E24-range choose 120k, only E6-range value resulting fign/fout between 1.5nF ign/fout 1.74). cold ignition CSW=33nF (see paragraph 5.3) D1.D 4=1N4007, FS=10nF, CVDD=10nF CDV=220pF (see section 6.4). HB1=CHB2=47nF (see section 6.4). LFILT choosen 2.7mH.
RFUS D1.D4 CBUF1, CBUF2 CBUF LFILT CHB1, CVDD COSC ROSC DESCRIPTION Fusible inrush current limiter resistor Voltage doubler diodes Bridge rectifier diodes Buffer capacitors Buffer capacitor Filter inductor Half bridge capacitors Lamp capacitor Lamp inductor dV/dt limiting capacitor Floating Supply buffer capacitor voltage supply buffer capacitor Oscillator capacitor Oscillator resistor Sweep time capacitor REMARKS Special type, fusible, high peak power 115V/60HZ 1N4007 22µF/200V 2.7mH 47nF/200V 1.5nF/400V 3.1mH 220pF/500V 10nF/50V 10nF/50V 180pF/50V 120k/1/8W 100nF/25V 6.8µF/400V 2.7mH 47nF/200V 1.5nF/400V 3.1mH 220pF/500V 10nF/50V 10nF/50V 180pF/50V 120k/1/8W 33nF/50V 230V/50Hz 1N4007 High temperature electrolytic type High temperature electrolytic type Axial type Foil type, capable withstanding peak voltages twice it's rating E-16-Core
applications with UBA2024T
Some other examples
lamp (7W/150mA burner, suited cold ignition) (fout=46kHz)
RFUS D1.D4 CBUF1, CBUF2 CBUF LFILT CHB1, CVDD COSC ROSC DESCRIPTION Fusible inrush current limiter resistor Voltage doubler diodes Bridge rectifier diodes Buffer capacitors Buffer capacitor Filter inductor Half bridge capacitors Lamp capacitor Lamp inductor dV/dt limiting capacitor Floating Supply buffer capacitor voltage supply buffer capacitor Oscillator capacitor Oscillator resistor Sweep time capacitor REMARKS Special type, fusible, high peak power 115V/60HZ 1N4007 10µF/200V 2.2mH 47nF/200V 1.5nF/400V 3.1mH 220pF/500V 10nF/50V 10nF/50V 180pF/50V 110k/1/8W 100nF/25V 3.3µF/400V 2.2mH 47nF/200V 1.5nF/400V 3.1mH 220pF/500V 10nF/50V 10nF/50V 180pF/50V 110k/1/8W 33nF/50V 230V/50Hz 1N4007 High temperature electrolytic type High temperature electrolytic type Axial type Foil type, capable withstanding peak voltages twice it's rating E-16-Core
lamp (9.5W/150mA burner, suited cold ignition) (fout =42.5kHz)
RFUS D1.D4 CBUF1, CBUF2 CBUF LFILT CHB1, CVDD COSC ROSC DESCRIPTION Fusible inrush current limiter resistor Voltage doubler diodes Bridge rectifier diodes Buffer capacitors Buffer capacitor Filter inductor Half bridge capacitors Lamp capacitor Lamp inductor dV/dt limiting capacitor Floating Supply buffer capacitor voltage supply buffer capacitor Oscillator capacitor Oscillator resistor Sweep time capacitor REMARKS Special type, fusible, high peak power 115V/60HZ 1N4007 15µF/200V 2.7mH 47nF/200V 1.5nF/400V 3.1mH 220pF/500V 10nF/50V 10nF/50V 180pF/50V 120k/1/8W 100nF/25V 4.7µF/400V 2.7mH 47nF/200V 1.5nF/400V 3.1mH 220pF/500V 10nF/50V 10nF/50V 180pF/50V 120k/1/8W 33nF/50V 230V/50Hz 1N4007 High temperature electrolytic type High temperature electrolytic type Axial type Foil type, capable withstanding peak voltages twice it's rating E-16-Core
applications with UBA2024T
lamp (11W/125mA burner, needing warm ignition) (fout=42.5kHz)
RFUS D1.D4 CBUF1, CBUF2 CBUF LFILT CHB1, CVDD COSC ROSC DESCRIPTION Fusible inrush current limiter resistor Voltage doubler diodes Bridge rectifier diodes Buffer capacitors Buffer capacitor Filter inductor Half bridge capacitors Lamp capacitor Lamp inductor dV/dt limiting capacitor Floating Supply buffer capacitor voltage supply buffer capacitor Oscillator capacitor Oscillator resistor Sweep time capacitor REMARKS Special type, fusible, high peak power
115V/60HZ 1N4007 22µF/200V 3.9mH 33nF/200V 1.5nF/400V 3.5mH 100pF/500V 10nF/50V 10nF/50V 180pF/50V 120k/1/8W 470nF/16V
230V/50Hz 1N4007
High temperature electrolytic type High temperature electrolytic type Axial type Foil type, capable withstanding peak voltages twice it's rating E-16-Core
6.8µF/400V 3.9mH 33nF/200V 1.5nF/400V 3.5mH 100pF/500V 10nF/50V 10nF/50V 180pF/50V 120k/1/8W 330nF/16V
lamp (12.5W/180mA burner, suited cold ignition) (fout=40kHz)
RFUS D1.D4 CBUF LFILT CHB1, CVDD COSC ROSC DESCRIPTION Fusible inrush current limiter resistor Bridge rectifier diodes Buffer capacitor Filter inductor Half bridge capacitors Lamp capacitor Lamp inductor dV/dt limiting capacitor Floating Supply buffer capacitor voltage supply buffer capacitor Oscillator capacitor Oscillator resistor Sweep time capacitor REMARKS Special type, fusible, high peak power High temperature electrolytic type Axial type Foil type, capable withstanding peak voltages twice it's rating E-16-Core 230V/50Hz 1N4007 6.8µF/400V 3.3mH 47nF/200V 1.8nF/400V 3.1mH 220pF/500V 10nF/50V 10nF/50V 180pF/50V 130k/1/8W 68nF/50V
applications with UBA2024T
DEMO BOARD LAMP
lamp (150mA burner, cold ignition, fout =46kHz)
RFUS D1.D4 CBUF LFILT CHB1, CVDD COSC ROSC DESCRIPTION Fusible inrush current limiter resistor Bridge rectifier diodes Buffer capacitor Filter inductor Half bridge capacitors Lamp capacitor Lamp inductor dV/dt limiting capacitor Floating Supply buffer capacitor voltage supply buffer capacitor Oscillator capacitor Oscillator resistor Sweep time capacitor REMARKS Special type, fusible, high peak power High temperature electrolytic type Axial type Foil type, capable withstanding peak voltages twice it's rating E-16-Core 230V/50Hz 1N4007 3.3µF/400V 1.8mH 100nF/200V 2.2nF/400V 2.7mH 220pF/500V 10nF/50V 10nF/50V 180pF/50V 110k/1/8W 33nF/50V
applications with UBA2024T
QUICK MEASUREMENTS
Table Measured values compared with calculated values Input voltage Input fout Ilamp calculated preheat
/frequency4 115V/50Hz 230V/50Hz 115V/60Hz 230V/50Hz 115/60Hz 230V/50Hz 115/60Hz 230V/50Hz 115V/60Hz 230V/50Hz 230V/50Hz
configuration
Lamp power
standard standard doubler standard doubler standard doubler standard doubler standard standard
maximum maximum
28.8kHz 28.8kHz 45.9kHz 45.9kHz 42.5kHz 42.5kHz 42.5kHz 42.5kHz 42.5kHz 42.5kHz 39.7kHz
measured5 29.1kHz 29.0kHz 48.7kHz 48.6kHz 45.1kHz 44.7kHz 44.0kHz 44.0kHz 45.2kHz 44.8kHz 41.4kHz
Ilamp using measured measured 95mA 97mA 96mA 94mA 145mA 138mA 147mA 144mA 148mA 142mA 150mA 148mA 120mA 115mA 120mA 127mA 139mA 129mA 140mA 141mA 161mA 171mA
Figure Cold starting lamp waveforms. (CSW=10nF)
Measurement 115V/60Hz were done 115V/50Hz with extra capacitance added CBUF1 CBUF2. resistor used Rosc, capacitor used Cosc. Tolerances Rosc Cosc both frequancy tolerance Rosc Cosc with less tolerance better match between calculated measured frequency needed.
applications with UBA2024T
Figure Lamp start-up with `warm' ignition. (CSW=330nF)
applications with UBA2024T
APPENDIX
Application board layout example
layout which UBA2024T mounted, considerable influence performance Issues taken into account are: Coils with open magnetic circuit should placed above other side PCB). axial filter inductor used LFILT should placed same direction minimize magnetic field pick-up. output components HB1, CHB2, LLA, CDV) their interconnections should placed side Oscilator (pin "RC") sweep (pin "SW") should shielded form output/lamp ground track. Components these pins should placed close possible. Capacitors should placed close effective heat transfer SGND pins need soldered copper plane which also beneath extends besides much possible. Fixing board using thermal conductive glue also helps.
course, size shape lamp base. Below layout demoboard, used measurements mentioned this application note, shown example. With it's diameter only 35mm it's smaller then most currently used CFL-ballast PCBs. It's suited either popular core lamp inductor radial-type I-core inductor.
Figure Layout (left) component placement (right) application demoboard (actual size 35mm diameter)
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