UM10389 36 W TLD application with UBA2014
Contents
1. State logic reset state start up state preheat state ignition state burn state hold state powerdown state H voltage sensor Ir Average 1 e current sensor IREF CF LVS CSW Fig 4 UBA2014 block diagram Figure 4 shows the block schematic diagram of the UBA2014 The block state logic forms the heart of the controller and controls all other internal functions Initial start up is achieved by means of charging an external capacitor C15 in Figure 5 connected to pin 7 The state logic will be reset and both outputs GL and GH are set to low reset state Reaching a voltage of 13 6 V the controller enables the blocks voltage controlled oscillator VCO the Adaptive Non overlap Time ANT the PReheat Timer PRT the Preheat current sensor PCS and the Lamp Voltage Sensor LVS The VCO generates a sawtooth shaped voltage between 2 5 V and 0 V The frequency is determined by the value of the capacitor connected to pin 3 C14 the resistor connected to pin 4 R12 and the voltage at pin 2 The minimum frequency is determined by R12 and C14 see also Section 4 The maximum frequency at which the circuit starts oscillating is 2 5 times the minimum frequency The comparator in the VCO changes the sawtooth into a block voltage which drives the driver logic The driver logic drives the HS driver and the2. NXP B V 2009 All rights reserved For more information please visit http www nxp com For sales office addresses please send an email to salesaddresses nxp com Date of release 2 October 2009 Document identifier UM10389 1
3. LS driver but with a frequency which is half the VCO frequency The first switching cycle the drive signal for the LS driver is made extra long to enable the bootstrap to charge the externally connected bootstrap capacitor between pins 9 and 11 The gates of the power MOSFETS are connected to GH and GL The ANT ensures that both power MOSFETs have the same on time which is independent of the frequency The voltage at pin 12 is measured across externally connected resistor R16 see Figure 5 The PRT is included to determine the preheat time and ignition time The preheat time is defined by the capacitor connected to pin 1 C12 and resistor R12 connected to pin 4 It consists of seven pulses at C12 The maximum ignition time is one pulse at C12 The circuit is operational during start up and in case of a fault condition for example when no lamps are connected UM10389 1 NXP B V 2009 All rights reserved User manual Rev 01 2 October 2009 5 of 16 NXP Semiconductors U M1 0389 UM10389 1 36 W TLD application with UBA2014 The preheat time begins as soon as the circuit starts oscillating Capacitor C13 at pin 2 is connected to the input of the VCO and will be discharged ensuring a defined a frequency sweep which starts at the maximum frequency By charging the capacitor with a constant current controlled by the PCS the frequency will decrease until the preheat voltage measured at pin 8 exceeds an internally fixed voltage
4. 2222 376 82822 2222 370 41104 2222 370 41104 9338 123 60115 9337 534 10153 9338 123 60115 2412 086 28238 PN UBA2014 N1A 3128 138 34871 2422 015 19387 2422 015 19387 2422 015 19387 2322 193 13105 2322 734 68202 2322 711 61224 3314J 1M 2322 730 61103 Component 12 nF 1 nF 100 nF 1 2 nF 10 uF 390 pF 5 6 nF 330 nF 220 nF 100 pF 330 nF 6 8 nF 56 nF 68 nF 8 2 nF 100 nF 100 nF BYD77D Voltage regulator BYD77D 1A UBA2014 N1A LAMP_COIL SCREW_CON_2P SCREW_CON_2P SCREW_CON_2P 1MQ 8 2 KQ 220 k 1MQ 10 ko Series 12NC update 12NC update 12NC update Hi voltage ASH 043 Hi voltage 12NC update X7R 12NC update 12NC update 12NC update MKT 370 12NC update MKP 379 KP MMKP 376 MKT 370 MKT 370 Rectifier BZD23C Rectifier SLOW IC Universal Coil SINGLE ARRAY SINGLE ARRAY SINGLE ARRAY PRO1 RC12H RCO1 Typ3314 RC11 Rating 50 V 50V 50V 1000 V 450 V 2000 V 50V 25 V 25 V 50 V 25 V 250 V 50 V 400 V 1600 V 250 V 250 V 12V Tolerance 5 96 5 96 5 96 10 20 96 10 5 96 10 96 10 5 96 10 10 10 5 96 5 96 10 10 5 1 5 0 2 5 Vendor PHYCOMP PHYCOMP PHYCOMP Panasonic BC muRata PHYCOMP PHYCOMP PHYCOMP PHYCOMP PHYCOMP BC PHYCOMP BC BC BC BC NXP NXP NXP NXP MAG45 MAG45 MAG24 BC PHYCOMP PHYCOMP BOURNS PHYCOMP Geometry C1206 C0805 C1206 C_B3_L7_P5mm CASE_A03 CER3_1 C1206 C1206 C1206
5. C0805 C1206 C370_A C0805 C B5 L17 5 P15mm C B7 L26 P22mm5 C370 D C370 D SOD87 SOD81 SOD87 GLAS_HOLDER SOT109 LAMP coil SCREW CON 2P SCREW CON 2P SCREW CON 2P PRO1 R0805 R1206 3314J R0805 sjen zew jo lg 1 vlLOZVaN uum uoneordde GIL M 9 68E0 LINN SJ10 onpuooiulesS dXN jenuew asn 6002 49909190 Z L0 eH 91406 68E0LWN pease siyBu ly 6002 5 8 dXN Table 1 Bill of materials continued Reference Part no R8 R9 R10 R12 R13 R14 R16 R17 R18 R20 TP2 TP2 TP5 TP6 TP7 TP12 TP13 TP16 TRI TR2 2322 711 61822 2322 730 61479 2322 193 13105 2322 734 63303 2322 734 61501 2322 156 11008 2322 156 11508 2322 711 91032 2322 193 13184 2322 730 61224 2422 034 15068 2422 034 15068 2422 034 15068 2422 034 15068 2422 034 15068 2422 034 15068 2422 034 15068 2422 034 15068 Component 8 2 KQ 47Q 1 MQ 33 kQ 150 0 10 1 50 0 180 kQ 220 kQ SOLDER PIN_small SOLDER PIN_small SOLDER PIN small SOLDER PIN small SOLDER PIN small SOLDER PIN small SOLDER PIN small SOLDER PIN small IRF820 IRF820 Series RCO01 RC11 PRO1 RC12H RC12H MRS25 MRS25 RCO1 PRO1 RC11 fets fets Rating Tolerance 5 5 5 1 1 1 1 5 5 5 Vendor PHYCOMP PHYCOMP BC PHYCOMP PHYCOMP BC BC PHYCOMP BC PHYCOMP INT RECT INT RECT Geometry R1206 R0805 PRO1 R0805 R0805 MRS25 MRS25 R1206 PRO1 R0805 SOLDER_
6. power down state The circuit can be started up again by lowering the voltage at pin 7 to below the reset level of 5 5 V If one disconnects the lamp during normal operation the lamp voltage will pass the Viampfail level and the ignition timer will start After a short period the Viampmax level is reached and after the ignition time the controller enters the power down state NXP B V 2009 All rights reserved User manual Rev 01 2 October 2009 6 of 16 t 68 01An jenuew Jas 6002 190120 Z 10 eu rub tak TRI IRF820 LAMP COIL 1 9mH UBA2014 N1A P1 8 R18 nt AF 3 S Len cn cn o T sonF T220nF 100p L Re t2H Fig 5 Circuit diagram peniesei sjuBu Iv 6002 A dXN 9LJ0 7 S10 onpuooiulesS dXN weibeip nal Eg vlLOZVaN uium uoneordde GIL M 9 68e0 LINN 6002 1990190 Z 10 ed jenuew ssn 91408 E 6860 WN peniesei sjuBu Iv 6002 N8 dXN Table 1 Bill of materials Reference Part no C2 C3 C5 C6 C7 C8 C10 C12 C13 C14 C15 C17 C19 C20 C22 C23 C24 D1 D3 D4 F1 IC1 L1 P1 P4 P5 R1 R2 R3 R4 R5 2222 591 16628 2222 861 12102 2222 581 16641 ECKA3A122KBP 2222 043 17109 DE0707391K 2222 591 16624 2238 911 15656 2222 911 16654 2222 861 12101 2222 911 16656 2222 370 41682 2222 590 16637 2222 379 54683
7. the accuracy or completeness of information included herein and shall have no liability for the consequences of use of such information 6 2 Disclaimers General Information in this document is believed to be accurate and reliable However NXP Semiconductors does not give any representations or warranties expressed or implied as to the accuracy or completeness of such information and shall have no liability for the consequences of use of such information Right to make changes NXP Semiconductors reserves the right to make changes to information published in this document including without limitation specifications and product descriptions at any time and without notice This document supersedes and replaces all information supplied prior to the publication hereof UM10389 1 Suitability for use NXP Semiconductors products are not designed authorized or warranted to be suitable for use in medical military aircraft space or life support equipment nor in applications where failure or malfunction of a NXP Semiconductors product can reasonably be expected to result in personal injury death or severe property or environmental damage NXP Semiconductors accepts no liability for inclusion and or use of NXP Semiconductors products in such equipment or applications and therefore such inclusion and or use is at the customer s own risk Applications Applications that are described herein for any of these products are for illus
8. the charging of C13 by an internally fixed current During this continuously decrease in frequency the circuit approaches the resonance frequency fo of the ballast coil and lamp capacitor 40 kHz The ignition voltage of the lamp is designed above the Viampfail level If the lamp voltage passes the Viamprai level the ignition timer is started If the preheating of the electrodes was correct the increasing voltage across the lamp will ignite it Because of the ignited lamp the voltage across the lamp will drop below the Viampfail level and the ignition timer will stop The frequency will further decrease until the minimum frequency is reached Then the lamp is ignited and the burn state begins If however at the end of the ignition time the lamp voltage still exceeds the lamp fail level Viamp gt Viampfail then the assumption is that the lamp has not ignited and the IC enters the power down state During the ignition of the lamp and the burn phase the capacitive mode protection ACM ensures a safe operation of the power MOSFETs However the ignition voltage increases with the ageing of the lamp To avoid overload of the key components the maximum ignition voltage Viampmax is limited and controlled by the LVS circuit pin 13 The maximum ignition time in which the lamp should ignite is determined by Equation 16 tgn EIU RIZ 61 16 In the burn state the ACS of the UBA2014 controls the lamp current As the system efficiency is hig
9. 3 during start up and preheat phase 273 V peak 12 03 50 3 5s 26 j LIEN mI T T Ignition _ hh m p Preheat gt Burn 0n DC i 200 KS s V V V DC _f 3 DC 8 296 kV V DC i O STOPPED AJN Fig 7 Viamp during the preheat ignition and burn phase UM10389 1 NXP B V 2009 All rights reserved User manual Rev 01 2 October 2009 13 of 16 NXP Semiconductors UM10389 UM10389 1 36 W TLD application with UBA2014 11 52 43 T 10 ms 200 V Viampmax t 50 11549 DC Preheat Ignition 7 Burn P n 2 MS s g2 v OC p 3 DC 0 576 kV 4 1 V DC x O STOPPED The lamp voltage is controlled at the calculated Viampmax level After 20 ms the lamp ignites and we see the transition to the burn phase If the lamp does not ignite at the end of the ignition time the IC enters power down state Fig 8 Viam during the ignition phase NXP B V 2009 All rights reserved User manual Rev 01 2 October 2009 14 of 16 NXP Semiconductors UM10389 6 Legal information 36 W TLD application with UBA2014 6 1 Definitions Draft The document is a draft version only The content is still under internal review and subject to formal approval which may result in modifications or additions NXP Semiconductors does not give any representations or warranties as to
10. PIN_small SOLDER_PIN_small SOLDER_PIN_small SOLDER_PIN_small SOLDER_PIN_small SOLDER_PIN_small SOLDER_PIN_small SOLDER_PIN_small TO220 TO220 vlLOZVaN uum uoneordde GIL M 9 68 0LINAn1 S10 onpuooiulesS dXN NXP Semiconductors U M1 0389 36 W TLD application with UBA2014 4 Lamp circuit operation and dimensioning UM10389_1 In this chapter a description will be given how the lamp circuit for a 36 W TLD lamp can be dimensioned It is assumed that the supply of 400 V is constant and that typical working frequency fy is equal to 45 kHz The RMS value of the half bridge voltage Vno using the first harmonic approximation can be calculated with Equation 1 Vip 2 400 v 180 v 1 The minimum frequency is determined by R12 and C14 see also the UBA2014 data sheet Equation 2 shows the calculation of fmax fus 12 107 R12 C14 40 kHz 2 As a result the maximum frequency is equal to Equation 3 fnax 2 2 fnin 100 kHz 3 During the start up phase the working frequency starts at the maximum frequency As the load on the half bridge circuit consists of the series connected LC circuit this is a safe frequency at which currents and voltages are low The electrodes must be preheated to secure a long lifetime and an efficient ignition of the lamp During the preheating phase the preheat timer determines the preheating time Equation 4 4 ig 1710 RIZ C 2 8 185 s 4 The preheating current lpn
11. UM10389 36 W TLD application with UBA2014 Rev 01 2 October 2009 User manual Document information Info Content Keywords UBA2014 Half bridge driver Abstract The UBA2014 integrated half bridge driver IC has been designed for driving electronically ballasted fluorescent lamps The IC provides the drive function for two discrete power MOSFETs founded by Philips NXP Semiconductors U M1 0389 36 W TLD application with UBA2014 Revision history Rev Date Description 01 20091002 First issue replaces application note AN10181 Contact information For more information please visit http www nxp com For sales office addresses please send an email to salesaddresses nxp com UM10389 1 NXP B V 2009 All rights reserved User manual Rev 01 2 October 2009 2 of 16 NXP Semiconductors U M1 0389 36 W TLD application with UBA2014 1 Introduction UM10389 1 The UBA2014 integrated half bridge driver IC has been designed for driving electronically ballasted fluorescent lamps The IC provides the drive function for two discrete power MOSFETS Besides the drive function the IC also includes a level shift circuit an oscillator a lamp voltage monitor a current control function a timer function and protections This user manual gives a description of a typical integrated 36 W TLD application The voltage fed half bridge is supplied by a constant 400 V DC supply either an extern
12. al or a PFC supply According IEC61000 3 2 limits for harmonic current emission power factor correction for loads over 25 W is required see Figure 1 Mains voltage gt 400Vdc Application L GND Fig 1 Input circuitry using a PFC Mains voltage roy Rectified mains 230Vac Application GND Fig 2 Normal input circuitry If complying with the IEC61000 3 2 standard is not required a normal input circuit like in Figure 2 can be used Keep in mind that the lamp power is not constant over a big input voltage range e g 190 V AC to 264 V AC The voltage fed half bridge topology allows for operating easily in Zero Voltage Switching ZVS series resonant mode thus reducing the transistor switching losses and the electromagnetic interference During the preheat time the UBA2014 controls the current which flows in the filament of the lamp The preheat timer and control system determine the optimal preheat time and preheat current to make sure the lamp has a long life and an efficient ignition After the preheat time the lamp must be ignited by reducing the switching frequency in this way increasing the voltage across it The IC controls the maximum ignition voltage and the ignition timer determines the maximum ignition time During this phase the capacitive mode protection ensures a safe operation of the power MOSFETs In the burn phase the lamp current is controlled by the average current system In this phas
13. e the lamp can be dimmed to a low level by frequency dimming The UBA2014 has protections for lamp ageing lamp failures and lamp removal The power down function can safely switch off the power inverter NXP B V 2009 All rights reserved User manual Rev 01 2 October 2009 3 of 16 NXP Semiconductors UM10389 2 Features 36 W TLD application with UBA2014 Integrated half bridge power IC for fluorescent applications Integrated high side low side including bootstrap circuitry Based on the BCD 650 V power logic technology Accurate oscillator and timer Adjustable frequency range with fixed fmax fmin ratio Adaptive non overlap time control Capacitive mode protection Adjustable preheat current and time control Single ignition attempt Power down function Soft start by frequency sweep down from start frequency Adjustable ignition voltage control Lamp current control e Down to 10 dimming Protection against lamp failures or lamp removal e SO16 DIP16 package 3 General description 3 1 Printed circuit board Fig 3 Remark this controller had no official number The printed circuit board of the UBA2014 application UM10389 1 NXP B V 2009 All rights reserved User manual Rev 01 2 October 2009 4 of 16 NXP Semiconductors U M1 0389 36 W TLD application with UBA2014 3 2 Block diagram F Bootstrap
14. h the lamp power Piamp is almost equal to input power As the 400 V supply voltage is constant Piamp can be kept constant by controlling the averaged voltage across resistor R14 In this way the lamp current is controlled Dimming is performed by changing the reference level at the CSP pin pin 15 by turning potentiometer R4 In this way the input voltage of the voltage controlled oscillator regulates the frequency and so indirectly also the lamp current The start up current for the UBA2014 is derived from the 400 V via R1 R10 and one of the lamp electrodes If the lamp is not present the IC will not start up As soon as VDDhigh is exceeded the IC starts oscillating The half bridge voltage Vip approximately 180 V together with dv dt capacitors behave like a current source which supplies not only the IC and the gates of the MOSFETs but also generates a stable 12 V supply More information about the controller can be found in the UBA2014 data sheet For more information about HF driving the 36 W T8 lamp see EC60081 sheet 7420 NXP B V 2009 All rights reserved User manual Rev 01 2 October 2009 12 of 16 NXP Semiconductors U M1 0389 36 W TLD application with UBA2014 5 Quick measurements 56 Sep 81 12 06 26 20 ns 18 8 nV 20 ns 200 V Milli 20 ns Pind uP ale Preheat 116 nV DC 2 2 V DC i 5 MS s B 2 V DC i 3 DC 0 296 kV 4 1 V 0 D STOPPED Fig 6 electrode 1 and Viamp
15. nance frequency of L1 and C22 Equation 6 1 0 JLI C22 Oo sc an fo TF Characteristic impedance Equation 7 z EL g C22 Frequency deviation Equation 8 Ana 06 Transfer ratio during preheat Equation 9 er NT 1 je Poi Va 1 euLI C22 1 A oy L1 C22 Then yields Equation 10 Vpl D For the preheat current yields Equation 11 Donde y iA Vw ph hb Z 1 oy LI C22 1 A o Filling in the known values for lon Zo and Vhp yields Equation 12 I Zo L5 ph Vib AP This equation has two solutions Equation 13 and Equation 14 LD L3 A 10 12 Solving this two equations give four results for A Keeping in mind that A is the ratio between ph and wo and that ph gt 0 inductive mode the result is a value of 1 39 So fj 139 fy 55 6 kHz NXP B V 2009 All rights reserved User manual Rev 01 2 October 2009 11 of 16 NXP Semiconductors U M1 0389 UM10389 1 36 W TLD application with UBA2014 The other solutions for are 0 72 capacitive mode and 0 72 and 1 39 theoretically possible but negative frequencies do not exist The preheat voltage then is Equation 15 Vin Vi 193 V 15 Hr a9 or a 273 V peak see Figure 6 low enough to prevent early ignition the minimum ignition voltage for a TLD36W is 290 V RMS During the ignition phase the working frequency is decreased because of
16. of 0 6 V This voltage is measured across externally connected resistor R14 After the preheat time the state logic disables the PCS and the frequency further sweeps down until the lamp circuit reaches the resonance frequency of the lamp capacitor and ballast coil Two voltage levels have been defined to ensure that the lamp will ignite Viampfail aNd Viampmax measured at pin 13 LVS The ignition level is between them Passing the Viamprai enables the ignition timer If the lamp ignites the lamp voltage will and the voltage measured at pin 13 LVS will drop The ignition stops and the increasing voltage at pin 2 will force the controller to the minimum frequency At this point the controller enters the burn state and the Averaging Current Sensor ACS circuit is enabled The average current is measured across a resistor R14 and fed to pin 16 CS Pin 15 CS is externally connected via resistors to the reference voltage of 2 95 V If the CS voltage reaches the CS level the ACS circuit will take over the control of the lamp current The output voltage of the ACS circuit is fed to the VCO and regulates the frequency and as a result the lamp current If the lamp does not ignite the LVS voltage reaches the Viampmax level The frequency control will keep its frequency In this way the lamp voltage cannot increase any further After the adjusted ignition time the state logic will disable all internal circuits and the controller enters the
17. trative purposes only NXP Semiconductors makes no representation or warranty that such applications will be suitable for the specified use without further testing or modification Export control This document as well as the item s described herein may be subject to export control regulations Export might require a prior authorization from national authorities 6 3 Trademarks Notice All referenced brands product names service names and trademarks are the property of their respective owners NXP B V 2009 All rights reserved User manual Rev 01 2 October 2009 15 of 16 NXP Semiconductors UM10389 36 W TLD application with UBA2014 T Contents 1 Introduction err RI 3 2 Feat lesS vor eb bier aarti wee ee wee 4 3 General description use 4 3 1 Printed circuit board 00005 4 3 2 Block diagram 0 2 e eee eee eee 5 3 3 Circuit diagram 2 eee 7 3 4 Bill of materials llli 8 4 Lamp circuit operation and dimensioning 10 5 Quick measurements 13 6 Legal information lesse 15 6 1 Definitions llle 15 6 2 DisclaimerS 0000 cee eee eee eee 15 6 3 Trademarks 2 0 cc eee 15 7 Contents aia ee Rie ee 16 founded by Please be aware that important notices concerning this document and the product s described herein have been included in section Legal information
18. which flows through the electrodes and the lamp capacitor is controlled by the preheating current sensor circuit PCS pin 8 of the controller see Figure 4 and is determined by R14 R13 and R9 If the voltage on pin 8 reaches 0 6 V which means the current has a peak value of 0 788 A the controller enters the preheat state The RMS value of the preheat current Ip is 0 56 A then As the lamp voltage and lamp current of the 36 W TLD lamp are known Viamp 102 V liamp 0 32 A Riamp 319 Q and 0 52 A lt Iph lt 0 96 A at Tph 1 85 s one can define the transfer ration in burning condition with Equation 5 H E Viamp Riamp 0 57 hb 2 2 2 Riamp 9 L1 C22 Ry LI 5 with 2 0 fry L1 and C22 are the missing parameters For the required transfer ratio many combinations for L1 and C22 will do Choosing a standard E12 value for C22 like 8 2 nF L1 can be calculated with 1 9 mH as result The next step is to define the preheat frequency with these components which must be higher than the minimum frequency The preheat voltage has to be calculated also to prevent the lamp from igniting too early During preheating the transfer is only determined by L1 and C22 because the lamp has not ignited yet Defining of some equations NXP B V 2009 All rights reserved User manual Rev 01 2 October 2009 10 of 16 NXP Semiconductors UM10389 UM10389 1 36 W TLD application with UBA2014 The reso
Download Pdf Manuals
Related Search