UM10522 TEA1721 non-isolated universal mains buck and
Contents
1. 3 Features and benefits 3 Safety 3 Specification 4 Demo board connections 6 Operation and performance 7 No load power consumption 7 EfflGIGnCy hs RELIER ERE 7 Output voltage stability 8 Testresultls 3 2rr ml taney 10 ElectroMagnetic Interference 10 Demo board schematic 11 12 Implementation guidelines 13 Board layout 14 References 15 Legal information 16 Definitions llle 16 1 16 Trademarks 16 Gont nls 45 etre RR S Ra 17 Please be aware that important notices concerning this document and the product s described herein have been included in section Legal information O NXP B V 2012 All rights reserved For more information please visit http Awww nxp com For sales office addresses please send an email to salesaddresses nxp com Date of release 8 March 2012 Document identifier UM105222. 12 11 10 0 500 1000 1500 2000 2500 output power mW Fig 5 Buck mode typical output voltage stability as a function of load All information provided in this document is subject to legal disclaimers NXP B V 2012 All rights reserved User manual Rev 1 8 March 2012 8 of 17 NXP Semiconductors UM10522 UM10522 Non isolated buck and buck boost converter demo board 14 Vout v 13 12 1 115 V 2 230 V AC aaa 002226 1 2 500 1000 1500 2000 2500 Pout mW Fig 6 Buck boost mode Typical output voltage stability as a function of load All information provided in this document is subject to legal disclaimers NXP B V 2012 All rights reserved User manual Rev 1 8 March 2012 9 of 17 NXP Semiconductors U M1 0522 Non isolated buck and buck boost converter demo board 6 Test results UM10522 6 1 ElectroMagnetic Interference The TEA1721 buck and buck boost mode converter application meets the requirements of EN55022 There is a margin of at least 10 dB with respect to the formal limits Sa LLL m i npr 002218 a at 115 V AC input voltage and 2 W output at 80 load j5 EEE 3 EP CHAR ij Me mand A RE
3. non insulated mains voltages and high voltage circuits This product shall never be operated unattended This user manual describes a 12 V AC DC buck and 12 V AC DC non isolated buck boost mode SMPS that can be used to supply up to 2 5 W into a load The switch mode converter operates at a maximum frequency of around 50 kHz Overcurrent and short circuit protection are built in Under no load conditions the power consumption of this converter is in the range of 10 mW EMI filtering and optional surge voltage protection using TVS diodes is implemented in this circuit This application is a general purpose non isolated SMPS In applications where triacs are driven in the third quadrant such as white goods applications the negative output voltage with respect to Neutral or Phase makes buck boost converters particularly interesting The optional surge protection makes it suitable for use in environments where serious voltage transients can occur The absolute maximum RMS mains input voltage is 280 V AC 1 1 Features and benefits Compatible with Universal Mains Inrush current limitation EMI filtering to meet EMC requirements of EN55022 Surge input voltage protection 2 Safety Warning UM10522 The demo board is powered by AC mains voltage Avoid touching the board when power is applied An isolated housing is obligatory when used in uncontrolled non laboratory environments All information provided in
4. with the appropriate voltage rating Though more expensive it needs less board space Resistor R5 forms a small pre load for the converter When the output voltages are adjusted also adjust the pre load resistors to ensure that they consume roughly the same amount of power Depending on the connected load the pre load resistor can be eliminated Zener diode D7 is an elementary output OverVoltage Protection OVP When OVP is not needed eliminate the diode Capacitor C7 is used to obtain additional HF voltage stability and noise suppression Eliminate the capacitor when the feature is not needed UM10522 All information provided in this document is subject to legal disclaimers NXP B V 2012 All rights reserved User manual Rev 1 8 March 2012 13 of 17 NXP Semiconductors U M1 0522 Non isolated buck and buck boost converter demo board 10 Board layout The 34 3 mm x 34 3 mm evaluation PCB accommodates either a TEA1721 buck or buck boost mode application implementation This board can be used for the particular application shown in the circuit diagram and the associated component list aaa 002221 Top silk screen plus top component placement and drill pattern TEA1721 buck boost vs 1 01 re aj aaa 002222 b Bottom copper and bottom silk screen plus component placement Fig 10 PCB layout The bottom silk screen is normally not used in PCB production Merged with the
5. 1 d 002219 b 230 V AC input voltage and 2 W output at 80 load Fig 7 Typical EMI patterns measured at 2 W load All information provided in this document is subject to legal disclaimers NXP B V 2012 All rights reserved User manual Rev 1 8 March 2012 10 of 17 NXP Semiconductors UM10522 7 Demo board schematic Non isolated buck and buck boost converter demo board R1 D1 L1 J142 Pern IC1 1721 GND3 SOURCE zi C2 n I R4 C4 C5 R2 ZK J2 1 R5 C7 J1 2 gt 4 I J2 2 aaa 002220 Fig8 TEA1721 buck converter SMPS circuit diagram R1 D1 L1 J1 4 PH IC1 GND1 DRAIN GND2 2 1721 GND3 SOURCE C1 2 D6 FB VCC R4 c5 R2 I C3 AN 3 L2 4 C 2 1 ZK 25 D7 ZEc6 R5 zc J12 4 I J2 2 aaa 002375 Fig9 TEA1721 buck boost converter SMPS circuit diagram UM10522 All information provided in this document is subject to legal disclaimers NXP B V 2012 All rights reserved User manual Rev 1 8 March 2012 11 of 17 NXP Semiconductors U M1 0522 Non isolated buck and buck boost converter demo board 8 PCB components Tabl
6. 1 Photographs of the board UM10522 All information provided in this document is subject to legal disclaimers NXP B V 2012 All rights reserved User manual Rev 1 8 March 2012 5 of 17 NXP Semiconductors U M1 0522 Non isolated buck and buck boost converter demo board 4 Demo board connections Remark Mount the board in a shielded or isolated box for demonstration purposes TEA1721 Buck 120 neutral live aaa 002217 Fig 2 TEA1721XT Demo board connections UM10522 All information provided in this document is subject to legal disclaimers NXP B V 2012 All rights reserved User manual Rev 1 8 March 2012 6 of 17 NXP Semiconductors U M1 0522 Non isolated buck and buck boost converter demo board 5 Operation and performance UM10522 5 1 5 2 Basic operation of the IC is described in the TEA1721 data sheets No load power consumption Table 2 Typical no load power consumption Power supply Energy Star 2 0 requirement No load power consumption 115 V AC 60 Hz 300 mW 5 230 50 2 300 mW 8 mW The typical no load power consumption of the TEA1721 universal mains buck boost converter exceeds the Energy Star 2 0 level V requirement by approximately two orders of magnitude Efficiency Table 3 Buck mode typical efficiency data Parameter Energy Star Efficiency 2 0 level V average 25 load 50 load 75 load 100
7. load 115 V 60 Hz 67 9 80 81 2 80 4 79 3 79 1 230 V AC 50 Hz 67 9 78 7 77 6 78 9 79 79 1 Table 4 Buck boost mode typical efficiency data Parameter Energy Star Efficiency 2 0 level V average 25 load 50 load 75 load 100 load 115 V AC 60 Hz 67 9 78 2 79 5 78 7 77 6 76 8 230 V AC 50 Hz 67 9 77 3 76 7 78 77 1 77 5 The typical efficiency of the 1721 universal mains buck boost converter exceeds the Energy Star 2 0 level V requirement by approximately 10 96 on average 002376 100 00 efficiency 80 60 1 40 20 0 500 1000 1500 2000 2500 output power mW 1 230 V AC 2 115 V AC Fig 3 Buck mode typical efficiency as a function of load All information provided in this document is subject to legal disclaimers NXP B V 2012 AII rights reserved User manual Rev 1 8 March 2012 7 of 17 NXP Semiconductors U M1 0522 UM10522 5 3 Non isolated buck and buck boost converter demo board 100 002225 n 76 1 2 80 60 40 20 0 0 500 1000 1500 2000 2500 Pout mW 1 115 V AC 2 230 V AC Fig 4 Buck boost mode Typical efficiency as a function of load Output voltage stability 14 002377 output voltage V
8. UM10522 TEA1721 non isolated universal mains buck and buck boost converter demo board Rev 1 8 March 2012 User manual Document information Info Content Keywords TEA1724XT non isolated universal mains buck buck boost AC DC conversion Switched Mode Power Supply SMPS Abstract This user manual describes a 12 V AC DC buck and 12 V AC DC non isolated buck boost mode SMPS that can be used to supply up to 2 5 W into a load NXP Semiconductors U M1 0522 Non isolated buck and buck boost converter demo board Revision history Rev Date Description v 1 20120308 first issue Contact information For more information please visit http www nxp com For sales office addresses please send an email to salesaddresses nxp com UM10522 All information provided in this document is subject to legal disclaimers NXP B V 2012 All rights reserved User manual Rev 1 8 March 2012 2 of 17 NXP Semiconductors U M1 0522 Non isolated buck and buck boost converter demo board 1 Introduction WARNING Lethal voltage and fire ignition hazard The non insulated high voltages that are present when operating this product constitute a risk of electric shock personal injury death and or ignition of fire This product is intended for evaluation purposes only It shall be operated in a designated test area by personnel qualified according to local requirements and labor laws to work with
9. al 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 limitation all damages referenced above and all direct or general damages the entire liability of NXP Semiconductors its affiliates and their suppliers and customer 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 maximum extent permitted by applicable law even if any remedy fails of its essential purpose 12 3 Trademarks Notice All referenced brands product names service names and trademarks are the property of their respective owners NXP B V 2012 AII rights reserved User manual Rev 1 8 March 2012 16 of 17 NXP Semiconductors UM10522 Non isolated buck and buck boost converter demo board 13 Contents 12 1 12 2 12 3 13 Introduction
10. bottom copper it is shown here as a component placement reference only Populate all component positions in this application See Table 5 for a list of components Table 6 Drill tool table Drill tool code Drill diameter 1mm D 0 9 mm E 1 3 mm UM10522 All information provided in this document is subject to legal disclaimers User manual Rev 1 8 March 2012 NXP B V 2012 AII rights reserved 14 of 17 NXP Semiconductors U M1 0522 Non isolated buck and buck boost converter demo board 11 References 1 TEA1721XT Ultra low standby SMPS controller with integrated power switch 2 AN11060 TEA172X 5 W to 11 W power supply USB charger UM10522 All information provided in this document is subject to legal disclaimers NXP B V 2012 All rights reserved User manual Rev 1 8 March 2012 15 of 17 NXP Semiconductors UM10522 Non isolated buck and buck boost converter demo board 12 Legal information 12 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 the accuracy or completeness of information included herein and shall have no liability for the consequences of use of such information 12 2 Disclaimers Limited warranty and liability Information in this document
11. e 5 Demo board components Reference Description and value Part number Manufacturer C1 electrolytic capacitor 4 7 uF 400 V C2 electrolytic capacitor 4 7 uF 400 V C3 capacitor 10 pF 25 V C4 capacitor 100 nF 50 V C5 electrolytic capacitor 10 uF 35 V x C6 electrolytic capacitor 470 uF 16 V 7 capacitor 100 nF 50 V D1 diode S1M SMA D2 diode BZG03 C200 optional see text SMA BZG03 C200 D3 diode BZG03 C200 optional see text SMA BZG03 C200 D4 diode ES1JL SMF D5 diode BYG20J SMA BYG20J D6 diode ES1JL SMF D7 diode BZX384 B12 SOD323 BZX384 B12 NXP Semiconductors IC1 TEA1721 SO7 NXP Semiconductors JP1 jumper 0 must be installed for buck boost mode operation JP2 jumper 0 installed must be installed for buck mode only operation L1 1 mH 80 mA L2 1 mH 250 mA RMS Isat 500 mA R1 carbon resistor 47 R2 resistor 4 7 kO 1 96 R3 resistor 18 1 l l R4 resistor 1 Q 0 25 W R5 resistor 68 1 To set the output voltage with greater accuracy fine tuning is required UM10522 All information provided in this document is subject to legal disclaimers NXP B V 2012 All rights reserved User manual Rev 1 8 March 2012 12 of 17 NXP Semiconductors U M1 0522 Non isolated buck and buck boost converter demo board 9 Implementation guidelines The output voltage is adjus
12. 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 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 Semic
13. onductors 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 purposes only NXP Semiconductors makes no representation or warranty that such applications will be suitable for the specified use without further testing or modification UM10522 All information provided in this document is subject to legal disclaimers Customers are responsible for the design and operation of their applications and products using NXP Semiconductors products and NXP Semiconductors accepts no liability for any assistance with applications or customer product design It is customer s sole responsibility to determine whether the Semiconductors product is suitable and fit for the customer s applications and products planned as well as for the planned application and use of customer s third party customer s Customers should provide appropriate design and operating
14. 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 applications and products using NXP Semiconductors products in order to avoid 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 evaluation purposes only NXP Semiconductors 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 consequenti
15. ted using resistors R2 and R3 In Buck mode the converter can be used to generate an output voltage between 12 V DC and 32 V DC In buck boost mode the output voltage is between 12 V DC and 32 V DC The maximum output power and output current levels are adjusted using resistor R4 The maximum current allowed in the TEA1721 IC switching MOSFET is 700 mA Take care that under no circumstance the peak current in inductor L2 exceeds 700 mA Resistor R1 limits the inrush current The resistor must be a carbon resistor because metal film resistors can act as a fuse in this position If no inrush current limiting is required the resistor can be replaced with a short circuit EMI filtering is implemented using a single differential stage C1 L1 C2 Mount additional film capacitors in parallel with C1 and C2 for improved HF noise suppression Surge voltage protection is implemented using TVS diodes D2 and D3 The surge protection limits the DC bus voltage to 400 V maximum The TVS diodes choice determines the maximum allowable surge pulse energy The surge protection feature is optional When not needed diodes D2 and D3 can be eliminated To cope with negative voltage surge pulses diode D1 must be capable of handling a certain amount of avalanche surge energy The presence of resistor R1 helps to limit any avalanche surge current in diode D1 Capacitors C4 and C5 can be replaced with a single SMD 2 2 uF ceramic capacitor
16. this document is subject to legal disclaimers NXP B V 2012 All rights reserved User manual Rev 1 8 March 2012 3 of 17 NXP Semiconductors UM10522 3 Specification Non isolated buck and buck boost converter demo board Table 1 Demo board specification Parameter Value Comment AC line input voltage 85 V AC to 265 V AC supplied to J1 1 phase and J1 2 neutral Output voltages Maximum output current Maximum output power Output voltage accuracy Output voltage stability Efficiency Operating temperature EMC Compliance Board dimensions buck converter mode 12 V DC buck boost converter mode 12 V DC buck converter mode 200 mA buck boost converter mode 200 mA 2 5W 2 to 5 96 gt 1 77 96 at 100 load 40 C to 85 EN 55022 34 3 mm x 34 3 mm x 25 mm terminals supplied from connectors J2 1 12V J2 2 0 Vil supplied from connectors J2 1 0V J2 2 12 2 in load range 10 to 100 LxBxH 1 J2 2 is at the same potential as J1 2 2 J2 1 is at the same potential as J1 2 UM10522 All information provided in this document is subject to legal disclaimers NXP B V 2012 All rights reserved User manual Rev 1 8 March 2012 4 of 17 NXP Semiconductors U M1 0522 Non isolated buck and buck boost converter demo board TEA1721 Buck 4 7 1 01 a Front view b Back view Fig
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