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| an11187 uba2015/uba2017 saturati ng inductor support during ignition rev. 1 ? 16 august 2012 application note document information info content keywords uba2015, uba2017, saturating resonant tank inductor support abstract this application note describes how to use a uba2015/uba2017 or in combination with a resonant tank inductor that saturates during lamp ignition. this application note also applies to the uba2017 half-bridge controller ic without a pfc.
an11187 all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2012. all rights reserved. application note rev. 1 ? 16 august 2012 2 of 12 contact information for more information, please visit: http://www.nxp.com for sales office addresses, please send an email to: salesaddresses@nxp.com nxp semiconductors an11187 uba2015/uba2017 saturating in ductor support during ignition revision history rev date description v.1 20120816 first issue an11187 all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2012. all rights reserved. application note rev. 1 ? 16 august 2012 3 of 12 nxp semiconductors an11187 uba2015/uba2017 saturating in ductor support during ignition 1. introduction this application note describes how to us e a uba2015/uba2017 in combination with a resonant tank inductor that saturates during lamp ignition. the ignition voltage v ign is applied to the lamp for time t ign to ignite a fluorescent lamp. the v ign voltage is much higher than the nominal operating voltage of the lamp. most lamp ballasts apply an open lamp voltage to the lamp connector during the ignition state. the open lamp voltage is applied for between 100 ms and 200 ms to ensure old and cold lamps ignite. some lamp ballasts use a saturating inductor during the ignition state to reduce the size and cost of this inductor. the uba2015/uba2017 circuitry only supports sa turation protection. the ic reduces the on-time of the low-side half-bridge transistor when the inductor saturates. however, the high voltage is not maintained over the total programmable ignition time-out period. the uba2015/uba2017 can also be used to control inductor saturation during the ignition time-out period. the saturation is controlled during the programmable ignition time-out period. this function requires an extra circuit that connects to the cf pin capacitor. this extra circuit is explained in this application note. remark: unless otherwise stated, all voltages are typical values. 1.1 features ? operating the resonant tank inductor in saturation ? regulation is adjustable for several saturation levels 2. circuit diagram fig 1. circuit to suppor t inductor saturation an11187 all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2012. all rights reserved. application note rev. 1 ? 16 august 2012 4 of 12 nxp semiconductors an11187 uba2015/uba2017 saturating in ductor support during ignition the additional parts for inductor saturation regulation are: d cf , d1, d2, r cf , r sense(qlhb) and c sense(qlhb) . to reduce the sense resistor values, schottky diodes can be used on positions d1 and d2. 2.1 extended bill of materials 3. operation and performance at the end of the preheat stat e, the half-bridge frequency is swept down by increasing the voltage on the vco input (pin cifb). the current in the inductor increases during the sweep and the inductor starts to saturate. figure 2 shows the first ignition attempt and a small part of the second and final ignition attempt. the resonance capacitor c res integrates the current waveform to generate the ignition voltage. figure 2 shows the cf pin voltage on channel c4. when saturation pulses are present, the cf pin voltage is increased because of the signal injected by diodes d1 or d2. each time the cf pin reaches 2.5 v, the active mosfet is switched off. table 1. extended bi ll of materials part reference description c cf uba2015/uba2017 oscillator frequency setting c dc dc blocking capacitor c div capacitive lamp voltage divider c sense(qlhb) filter capacitor to remo ve hard switching spikes c res resonance capacitor d1 increases v cf when the l1a inductor saturates and qhhb is on d2 increases v cf when the l1a inductor saturates and qlhb is on d cf cf pin protection against negative voltages d vfb clamping diode to ground l1a resonant tank inductor l1b; l1c inductor l1 windings for heating the filaments r cf provide impedance to lift v cf r ghhb ; r glhb mosfet gate damping resistors r sense(qhhb) inductor current sense resistor when qhhb is on r sense(qlhb) inductor current sense resistor when qlhb is on r vfb1 ; r vfb2 resistor divider vfb pin voltage r vfb3 vfb pin voltage offset an11187 all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2012. all rights reserved. application note rev. 1 ? 16 august 2012 5 of 12 nxp semiconductors an11187 uba2015/uba2017 saturating in ductor support during ignition figure 2 shows the fault timer counting on chann el c2. the vfb pin activates counting and is necessary to shut down the ballast in case no lamp is present. the fault timer is activated using the vf b pin under the following circumstances: ? in the ignition state: when the vfb voltage is > v th(ov)(vfb) = 2.5 v and an11187 all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2012. all rights reserved. application note rev. 1 ? 16 august 2012 7 of 12 nxp semiconductors an11187 uba2015/uba2017 saturating in ductor support during ignition 5. simplified circuit it is possible to operate a saturating inductor wit h a smaller circuit for some ballast (large cifb capacitor, non-dimmable). remark: test only using r sense(qlhb) for inductor saturation regulation, do not mount r sense(qhhb) , d1 or d cf . the r sense(qlhb) value obtained is higher compared to figure 1 . fig 4. simplified circuit to support inductor saturation aaa-004406 an11187 all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2012. all rights reserved. application note rev. 1 ? 16 august 2012 8 of 12 nxp semiconductors an11187 uba2015/uba2017 saturating in ductor support during ignition 6. star ground configuration the uba2015/uba2017 is subjected to large disturbances because of the high peak current during saturation. these disturbances are caused when the half-bridge switching node has commuted to the bus voltage v bus . place the star ground near the gnd pin (15) of the uba2015 to minimize the common impedance of the ground tracks. route the bus voltage next to the ground bet ween the bus capacitor c11 and half-bridge mosfets to minimize the magnetic field of the high di/dt signal. xxxx xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx x xxxxxxxxxxxxxx xxxxxxxxxx xxx xxxxxx xxxxxxxxxxxxxxxxxxxxxxx xxxxxxxxxxxxxxxxxxxxxx xxxxx xxxxxx xx xxxxxxxxxxxxxxxxxxxxxxxxxxxxx xxxxxxxxxxxxxxxxxxxxxx xxxxxxxxxxx xxxxxxx xxxxxxxxxxxxxxxxxxx xxxxxxxxxxxxxxxx xxxxxxxxxxxxxx xxxxxx xx xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx xxxxxxxxxxxxxxxxxxxxxxxx xxxxxxx xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx xxxxxxxxxxx xxxxx x x an11187 all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2012. all rights reserved. application note rev. 1 ? 16 august 2012 9 of 12 nxp semiconductors an11187 uba2015/uba2017 saturating inductor support during ignition fig 5. star ground example to indicate board layout set-up ! ! " ! ! ! # ! # $# ! % " ! &'(' )))* an11187 all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2012. all rights reserved. application note rev. 1 ? 16 august 2012 10 of 12 nxp semiconductors an11187 uba2015/uba2017 saturating in ductor support during ignition 7. references [1] uba2016a/15/15a ? 600 v fluorescent lamp driver with pfc, linear dimming and boost function [2] uba2017/uba2017a ? 600 v fluorescent lamp driver with linear dimming function [3] an10958 ? fluorescent lamp driver with pfc using the uba2015/16 family [4] um10359 ? uba2016at demo board 1 ? 28 w dim and boost [5] um10438 ? uba2015ap evaluation board 1 ? 35 w t5 dimmable 120 v (ac) [6] um10440 ? uba2015at reference design 2 ? 35 w t5 dimmable 230 v (ac) [7] um10466 ? uba2015p reference design 2 ? 35 w t5 non-dimmable 230 v (ac) [8] um10486 ? uba2015p reference design 2 ? 35 w t5 non-dimmable 120 v (ac) [9] um10561 ? uba2017at reference design for 420 v (dc) [10] um10564 ? uba2017db1064 2 x 28 w t5 demo board an11187 all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2012. all rights reserved. application note rev. 1 ? 16 august 2012 11 of 12 nxp semiconductors an11187 uba2015/uba2017 saturating in ductor support during ignition 8. legal information 8.1 definitions draft ? the document is a draft versi on 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 the accuracy or completeness of information included herein and shall hav e no liability for the consequences of use of such information. 8.2 disclaimers limited warranty and liability ? 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 info rmation. nxp semiconductors takes no responsibility for the content in this document if provided by an information source outside of nxp semiconductors. in no event shall nxp semiconductors be liable for any indirect, incidental, punitive, special or consequential damages (including - without limitation - lost profits, lost savings, business interruption, costs related to the removal or replacement of any products or rework charges) whether or not such damages are based on tort (including negligence), warranty, breach of contract or any other legal theory. notwithstanding any damages that customer might incur for any reason whatsoever, nxp semiconductors? aggregate and cumulative liability towards customer for the products described herein shall be limited in accordance with the terms and conditions of commercial sale of nxp semiconductors. 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. suitability for use ? nxp semiconductors products are not designed, authorized or warranted to be suitable for use in life support, life-critical or safety-critical systems or equipment, nor in applications where failure or malfunction of an nxp semiconductors product can reasonably be expected to result in personal injury, death or severe property or environmental damage. nxp semiconductors and its suppliers accept 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 illustrative purpos es only. nxp semiconductors makes no representation or warranty that such applications will be suitable for the specified use without further testing or modification. customers are responsible for the design and operation of their applications and products using nxp semiconducto rs products, and nxp semiconductors accepts no liability for any assistance wi th applications or customer product design. it is customer?s sole responsibility to determine whether the nxp semiconductors product is suitable and fit for the customer?s applications and products planned, as well as fo r the planned application and use of customer?s third party customer(s). customers should provide appropriate design and operating safeguards to minimize the risks associated with their applications and products. nxp semiconductors does not accept any liability related to any default, damage, costs or problem which is based on any weakness or default in the customer?s applications or products, or the application or use by customer?s third party customer(s). customer is responsible for doing all necessary testing for the customer?s applic ations and products using nxp semiconductors products in order to av oid a default of the applications and the products or of the application or use by customer?s third party customer(s). nxp does not accept any liability in this respect. 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 competent authorities. evaluation products ? this product is provided on an ?as is? and ?with all faults? basis for evaluati on purposes only. nxp semico nductors, its affiliates and their suppliers expressly disclaim all warranties, whether express, implied or statutory, including but not limited to the implied warranties of non-infringement, merchantability and fitness for a particular purpose. the entire risk as to the quality, or arising out of the use or performance, of this product remains with customer. in no event shall nxp semiconductors, its affiliates or their suppliers be liable to customer for any special, indirect, consequential, punitive or incidental damages (including without limitation damages for loss of business, business interruption, loss of use, loss of data or information, and the like) arising out the use of or inability to use the product, whether or not based on tort (including negligence), strict liability, breach of contract, breach of warranty or any other theory, even if advised of the possibility of such damages. notwithstanding any damages that customer might incur for any reason whatsoever (including without limitat ion, all damages referenced above and all direct or general damages), the entire liability of nxp semiconductors, its affiliates and their suppliers and custom er?s exclusive remedy for all of the foregoing shall be limited to actual damages incurred by customer based on reasonable reliance up to the greater of the amount actually paid by customer for the product or five dollars (us$5.00) . the foregoing limitations, exclusions and disclaimers shall apply to the ma ximum extent permitted by applicable law, even if any remedy fails of its essential purpose. translations ? a non-english (translated) version of a document is for reference only. the english version shall prevail in case of any discrepancy between the translated and english versions. 8.3 trademarks notice: all referenced brands, produc t names, service names and trademarks are the property of their respective owners. nxp semiconductors an11187 uba2015/uba2017 saturating in ductor support during ignition ? nxp b.v. 2012. all rights reserved. for more information, please visit: http://www.nxp.com for sales office addresses, please se nd an email to: salesaddresses@nxp.com date of release: 16 august 2012 document identifier: an11187 please be aware that important notices concerning this document and the product(s) described herein, have been included in section ?legal information?. 9. contents 1 introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 1.1 features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2 circuit diagram . . . . . . . . . . . . . . . . . . . . . . . . . 3 2.1 extended bill of materials . . . . . . . . . . . . . . . . . 4 3 operation and performance . . . . . . . . . . . . . . . 4 4 step-by-step guide. . . . . . . . . . . . . . . . . . . . . . . 6 5 simplified circuit . . . . . . . . . . . . . . . . . . . . . . . . 7 6 star ground configuration. . . . . . . . . . . . . . . . . 8 7 references . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 8 legal information. . . . . . . . . . . . . . . . . . . . . . . 11 8.1 definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 8.2 disclaimers . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 8.3 trademarks. . . . . . . . . . . . . . . . . . . . . . . . . . . 11 9 contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 |
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