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UM10892 - NXP Semiconductors

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1. UM10892 All information provided in this document is subject to legal disclaimers NXP Semiconductors N V 2015 All rights reserved User manual Rev 1 8 July 2015 6 of 16 NXP Semiconductors U M1 0892 6 Operation TEA1995DB1295 synchronous rectifier controller demo board UM10892 6 1 6 2 Turn on The MOSFETs are turned on when the drain source voltage drops to below the turn on threshold 400 mV The corresponding gate driver output turns on the external SR MOSFET The gate of this MOSFET is rapidly charged to a level that exceeds its threshold level After the turn on phase the regulation phase starts There is no minimum on time Regulation mode and turn off During regulation mode the IC regulates the voltage difference between the drain and the source sense inputs to an absolute level of 55 mV The corresponding gate driver output level is adjusted accordingly In this mode the gate driver voltage follows the waveform of the current through the external MOSFET When the current drops to lower values the corresponding gate driver output is discharged to a value just above the gate source threshold level of the external MOSFET The discharge enables a quick turn off of the external MOSFET when the current reaches zero Especially at Continuous Conduction Mode CCM conditions it is important to choose a MOSFET with a sufficiently low Rpgon value It enables the discharge of the gate driver output to
2. UM10892 GreenChip TEA1995DB1295 synchronous rectifier controller demo board Rev 1 8 July 2015 User manual Document information Info Content Keywords TEA1995T LLC converter dual Synchronous Rectifier SR driver SO8 high efficiency power supply TEA1995DB1295 demo board Abstract This user manual describes how the TEA1995DB1295 demo board can be used in a resonant converter The demo board contains a TEA1995T SR controller in an SO8 package In addition to the TEA1995T the demo board contains two power MOSFETs The demo board replaces the secondary side of the resonant converter excluding the output capacitors and the feedback hardware There are two versions of the demo board available A version containing TO 220 MOSFETs UM10891 anda second version using LFPAK MOSFETs UM10892 NXP Semiconductors UM10892 Revision history TEA1995DB1295 synchronous rectifier controller demo board Rev Date Description v 1 20150708 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 UM10892 All information provided in this document is subject to legal disclaimers NXP Semiconductors N V 2015 All rights reserved User manual Rev 1 8 July 2015 2 of 16 NXP Semiconductors U M1 0892 TEA1995DB1295 synchronous re
3. TEA1995DB1295 synchronous rectifier controller demo board 11 Abbreviations Table 3 Abbreviations Acronym Description CCM Continuous Conduction Mode MOSFET Metal Oxide Semiconductor Field Effect Transistor SR Synchronous Rectifier UVLO UnderVoltage LockOut 12 References 1 TEA1995T data sheet GreenChip dual synchronous rectifier controller UM10892 All information provided in this document is subject to legal disclaimers NXP Semiconductors N V 2015 All rights reserved 14 of 16 User manual Rev 1 8 July 2015 NXP Semiconductors UM10892 TEA1995DB1295 synchronous rectifier controller demo board 13 Legal information 13 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 13 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 information N
4. 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 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 13 3 Trademarks Notice All referenced brands product names service names and trademarks are the property of their respective owners GreenChip is a trademark of NXP Semiconductors N V NXP Semiconductors N V 2015 All rights reserved User manual Rev 1 8 July 2015 15 of 16 NXP Semiconductors UM10892 TEA1995DB1295 synchronous rectifier controller demo board 14 Contents 13 1 13 2 13 3 14 Introdu
5. 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 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
6. MOSFETs The TEA1995T acts as a dual controlled amplifier For each side the input is the voltage difference between drain and source The corresponding gate driver signal is the output Resistors R1 and R2 are added to ensure easy layout design for a single sided board The resistor values must be in the range of 0 to 10 Use the lowest value for the fastest turn off time Capacitor C1 is a decoupling capacitor for the Vcc of the TEA1995T Connect it close to the IC In combination with resistor R5 it acts as a simple RC filter Provisions are made for snubbers resistor R3 capacitor C2 and resistor R4 capacitor C3 The components are not mounted However if high voltage spikes are present on the drain source connections of the MOSFETs they can be added Fig 8 E5 V ot y wirehole R5 VOUT 100 GND E6 o square 5mm a GND C1 C2 Q1 100 nF Q2 c3 1nF PSMN5R5 60YS 50V PSMN5R5 60YS 1 nF 50V T 50v n m n m R1 R2 ae C H AA 4 70 4 70 Oya in TP1 TP2 Am oe GATE_B GATE_A ai E1 square 5mm SEC1 DRAIN_B lt O Vout DRAIN_A E4 square 5mm SEC2 TEA1995DB1295 demo board schematic aaa 018324 UM10892 All information provided in this document is subject to legal disclaimers NXP Semiconductors N V 2015 All rights reserved User manual Rev 1 8 July 2015 9 of 16
7. just above the gate source threshold level of the external MOSFET When the current drops to zero this discharge makes a rapid switch off possible The rapid switch off is very important for CCM conditions It minimizes the reverse current and the related voltage overshoot on the drain terminal of the external MOSFET When the drain voltage exceeds 150 mV the driver output voltage is actively pulled low All information provided in this document is subject to legal disclaimers NXP Semiconductors N V 2015 All rights reserved User manual Rev 1 8 July 2015 7 of 16 NXP Semiconductors U M1 0892 TEA1995DB1295 synchronous rectifier controller demo board 6 3 Operational behavior Figure 7 shows the corresponding SR waveforms high current low current secondary current OA drain sense source sense OV voltage a Vreg drv Vact drv td act drv gt lt Vthreshold SR switch gate ov driver aaa 018615 Fig 7 Synchronous rectification signals UM10892 All information provided in this document is subject to legal disclaimers NXP Semiconductors N V 2015 All rights reserved User manual Rev 1 8 July 2015 8 of 16 NXP Semiconductors UM10892 TEA1995DB1295 synchronous rectifier controller demo board 7 Schematic Figure 8 shows the schematic diagram of the TEA1995DB1295 demo board Basically the board consists of the TEA1995T SR and two SR
8. of the TEA1995T in an SO8 package and two MOSFETs in an LFPAK package with a typical Rpson of 5 5 mQ Figure 3 shows the front side and back side of the demo board The TEA1995DB1295 demo board is a single layer board with one plated through via for improved solderability and robustness a Front m Pa E as vr R Fig 3 TEA1995DB1295 demo board photographs R4 E WWW NXP COM TEA1995081295 GNVON o ou Sime REC TEA1995 aaa 018322 aaa 018323 TUTE Ae RS a a b Back UM10892 All information provided in this document is subject to legal disclaimers NXP Semiconductors N V 2015 All rights reserved User manual Rev 1 8 July 2015 4 of 16 NXP Semiconductors U M1 0892 TEA1995DB1295 synchronous rectifier controller demo board 4 TEA1995DB1295 demo board setup UM10892 To ensure that the TEA1995DB1295 demo board can be used in various applications two versions are available e The TEA1995DB1294 demo board contains two NXP Semiconductors power MOSFETs PSMN3RO0 60PS TO 220 package intended for low output voltage 12 V applications with relative high output currents e The TEA1995DB1295 demo board contains two NXP Semiconductors power MOSFETs PSMN5R5 60PS LFPAK intended for applications with a higher output voltage 19 5 V and relatively lower output currents The demo boards can be incorporated into an existing resonant power supply Figure 4 an
9. 12 of 16 NXP Semiconductors UM10892 TEA1995DB1295 synchronous rectifier controller demo board Table 2 Extract from NXP Semiconductors Power MOSFETs Selection Guide Type number Package name Vpsmax Rpson max at ID max Qan typical Qc tot V VGS 10 V A nC typical mQ nC PSMN3R5 80PS TO 220AB 80 3 5 120 27 139 PSMN4R3 80ES I2PAK 80 4 3 120 28 111 PSMN4R3 80PS TO 220AB 80 4 3 120 28 4 111 PSMN4R4 80PS TO 220AB 80 4 1 100 25 112 PSMN5R0 80PS TO 220AB 80 4 7 100 21 87 PSMN6R5 80PS TO 220AB 80 6 9 100 16 71 PSMN8R2 80YS LFPAK56 80 8 5 82 12 55 PSMN8R7 80PS TO 220AB 80 8 7 90 11 52 PSMN4R3 100ES I2PAK 100 4 3 120 49 170 PSMN4R3 100PS TO 220AB 100 4 3 120 49 170 PSMN5R0 100ES I2PAK 100 5 120 49 170 PSMN5R0 100PS TO 220AB 100 5 120 49 170 PSMN5R6 100PS TO 220AB 100 5 6 100 43 141 PSMN7R0 100ES I2PAK 100 6 8 100 36 125 PSMN7R0 100PS TO 220AB 100 6 8 100 36 125 PSMN8R5 100ES I2PAK 100 8 5 100 33 111 PSMN8R5 100PS TO 220AB 100 8 5 100 33 111 PSMN6R3 120ES I2PAK 120 6 7 70 61 9 207 1 PSMN6R3 120PS TO 220AB 120 6 7 70 61 9 207 1 PSMN7R8 120ES I2PAK 120 7 9 70 50 5 167 PSMN7R8 120PS TO 220AB 120 7 9 70 50 5 167 UM10892 All information provided in this document is subject to legal disclaimers NXP Semiconductors N V 2015 All rights reserved User manual Rev 1 8 July 2015 13 of 16 NXP Semiconductors U M1 0892
10. 6990 Fig 1 TEA1995T pinning configuration SO8 1 1 Features e Adaptive gate drive for maximum efficiency at any load e Supply current in no load operation below 200 uA e Wide supply voltage range from 4 5 V to 38 V e Dual synchronous rectification for LLC resonant in SO8 package e Synchronous rectification for multi output flyback converters e Supports 5 V operation with logic level SR MOSFETs e Differential inputs for sensing the drain and source voltages of each SR MOSFET SR control without minimum on time e Adaptive gate drive for fast turn off at the end of conduction e UnderVoltage LockOut UVLO with active gate pull down All information provided in this document is subject to legal disclaimers NXP Semiconductors N V 2015 All rights reserved User manual Rev 1 8 July 2015 3 of 16 NXP Semiconductors U M1 0892 TEA1995DB1295 synchronous rectifier controller demo board 2 Safety warning The board application is AC mains voltage powered Avoid touching the board when power is applied An isolated housing is obligatory when used in uncontrolled non laboratory environments Always provide galvanic isolation of the mains phase using a variable transformer Figure 2 shows the symbols that identify isolated and non isolated devices 019aab173 019aab174 a Isolated b Not isolated Fig 2 Isolation symbols 3 TEA1995DB1295 photographs The TEA1995DB1295 demo board consists
11. NXP Semiconductors U M1 0892 TEA1995DB1295 synchronous rectifier controller demo board 8 Bill Of Materials BOM Table 1 TEA1995DB1295 bill of materials Reference Description and values Part number Manufacturer C1 capacitor 100 nF 50 V 0805 C2 capacitor not mounted 1 nF 0805 C3 capacitor not mounted 1 nF 0805 Q1 Q2 MOSFET Ron 5 5 MQ LFPAK PSMN5R5 60YS NXP Semiconductors R1 resistor 4 7 Q 0805 R2 resistor 4 7 Q 0805 R3 resistor 10 Q 0805 R4 resistor not mounted 10 Q 0805 R5 resistor not mounted 10 Q 0805 U1 IC TEA1995T SO8 NXP Semiconductors UM10892 All information provided in this document is subject to legal disclaimers NXP Semiconductors N V 2015 All rights reserved User manual Rev 1 8 July 2015 10 of 16 NXP Semiconductors U M1 0892 TEA1995DB1295 synchronous rectifier controller demo board 9 TEA1995DB1295 board layout aaa 018326 aaa 018325 a Front b Back Fig 9 TEA1995DB1295 demo board Board layout Some important guidelines for a good layout e Keep the trace from the DSA B pin to the MOSFET drain pin as short as possible e Keep the trace from the SSA B pin to MOSFET source pin as short as possible e Keep the area of the loop from the DSA B pin to MOSFET drain to MOSFET source to the SSA B pin as small as possible Make sure that this loop overlaps th
12. PSMN1R5 40ES I2PAK 40 1 6 120 32 136 PSMN1R5 40PS TO 220AB 40 1 6 150 32 136 PSMN1R6 40YLC LFPAK56 40 1 55 100 15 3 59 PSMN1R8 40YLC LFPAK56 40 1 8 100 10 9 45 PSMN1R9 40PL TO 220AB 40 1 7 150 40 9 230 PSMN2R1 40PL TO 220AB 40 2 2 150 29 6 168 9 PSMN2R2 40PS TO 220AB 40 2 1 100 25 110 PSMN2R6 40YS LFPAK56 40 2 8 100 14 63 PSMN2R8 40PS TO 220AB 40 2 8 100 17 71 PSMN3R3 40YS LFPAK56 40 3 3 100 11 2 49 PSMN4R0 40YS LFPAK56 40 4 2 100 7 38 PSMN4R5 40PS TO 220AB 40 4 6 100 8 8 35 PSMN5R8 40YS LFPAK56 40 5 7 90 7 8 28 8 PSMN8R0 40PS TO 220AB 40 7 6 77 3 8 17 PSMN8R3 40YS LFPAK56 40 8 6 70 4 5 20 PSMN2R0 60ES I2PAK 60 2 2 120 32 137 PSMN2R0 60PS TO 220AB 60 2 2 120 32 137 PSMN2R5 60PL TO 220AB 60 2 6 150 41 2 223 PSMN2R6 60PS TO 220AB 60 2 6 150 43 7 140 PSMN3R0 60ES I2PAK 60 3 100 28 130 PSMN3R0 60PS TO 220AB 60 3 100 28 130 PSMN3R3 60PL TO 220AB 60 3 4 130 31 175 PSMN3R9 60PS TO 220AB 60 3 9 130 33 103 PSMN4R2 60PL TO 220AB 60 3 9 130 27 151 PSMN4R6 60PS TO 220AB 60 4 6 100 14 8 70 8 PSMN5R5 60YS LFPAK56 60 5 2 100 11 2 56 PSMN7RO 60YS LFPAK56 60 6 4 89 9 6 45 PSMN7R6 60PS TO 220AB 60 7 8 92 10 6 38 7 PSMN8R5 60YS LFPAK56 60 8 76 7 7 39 PSMN3R3 80ES I2PAK 80 3 3 120 27 139 PSMN3R3 80PS TO 220AB 80 3 3 120 27 139 PSMN3R5 80ES I2PAK 80 3 5 120 27 139 UM10892 All information provided in this document is subject to legal disclaimers NXP Semiconductors N V 2015 All rights reserved User manual Rev 1 8 July 2015
13. XP 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 res
14. ctifier controller 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 non insulated mains voltages and high voltage circuits This product shall never be operated unattended UM10892 This user manual describes the TEA1995DB1295 demo board It provides a functional description supported with instructions on how to connect the board to obtain the best results and performance The TEA1995DB1295 demo board contains the secondary part of a single output LLC converter excluding the output capacitors and the feedback control hardware To use the TEA1995DB1295 demo board correctly an LLC converter board in which the demo board can replace the secondary part is required The TEA1995T is a dedicated controller IC for synchronous rectification on the secondary side of resonant converters It incorporates two driver stages for driving the SR MOSFETs which rectify the outputs of the central tap secondary transformer windings The two gate driver stages have their own sensing inputs and operate independently GDB GDA GND Vcc DSB DSA SSB SSA aaa 01
15. ction 000 000 e eee eee 3 Features ei eea naa anmi eee 3 Safety warning 0e cece eee eee 4 TEA1995DB1295 photographs 4 TEA1995DB1295 demo board setup 5 Connecting the TEA1995DB1295 demo board 6 Operation id cece ee ee ee ees 7 T r ON ae athe eet een ge Ree 2 ae RE aoe 7 Regulation mode and turn off 7 Operational behavior 0 8 Schematle ss oe cics cei adnia ink wee ee es 9 Bill Of Materials BOM 10 TEA1995DB1295 board layout 11 NXP Semiconductors Power MOSFETs 12 Abbreviations 000 cece eee eee 14 References a sss c ies ce aie cia eck a ade eee ee cee a 14 Legal information 00 eeeeenee 15 Definitions 0 0 cece eee eee 15 Disclaimers 2 00 00 15 Trad emarkS idie era epea ee ka eee ee 15 CONTENSO E ERE 16 Please be aware that important notices concerning this document and the product s described herein have been included in section Legal information NXP Semiconductors N V 2015 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 8 July 2015 Document identifier UM10892
16. d Figure 5 show the connection of the TEA1995DB1295 demo board to the secondary side of an LLC controller board The demo board has 4 connections Connect the 2 drain lines to the secondary outputs of the transformer Connect the GND connection to the power ground of the main board And connect the Vcc connection to the Vout terminal of the main board Use thick wires for the drain and GND connections as the currents in these tracks can be high The Vcc can be connected to the Vout with a small wire This wire is only required to supply the TEA1995T Vin Qprim1 beg PRIMARY CHB SIDE CONTROLLER Qprim2 Vout Ly Cout aaa 018320 Fig 4 TEA1995DB1295 demo board typical configuration All information provided in this document is subject to legal disclaimers NXP Semiconductors N V 2015 All rights reserved User manual Rev 1 8 July 2015 5 of 16 NXP Semiconductors U M1 0892 TEA1995DB1295 synchronous rectifier controller demo board Qprim1 Ke PRIMARY CHB SIDE CONTROLLER Qprim2 F aaa 018321 Fig 5 Placement of demo board in existing resonant converter 5 Connecting the TEA1995DB1295 demo board Figure 6 shows an example of the TEA1995DB1295 demo board used in a typical resonant adapter aaa 018702 Fig 6 TEA1995DB1295 demo board connected to 150 W resonant adapter board APBADC069
17. e power drain track or power source track as minimal as possible and the 2 loops do not cross each other Keep tracks from GD pins to gate of MOSFETs as short as possible Decouple pins Vcc and GND as close to the IC as possible with a small 100 nF capacitor e Use separate clean tracks for the Vcc pin and GND If possible use a small ground plane underneath the IC which is good for heat dispersion e Keep the ground and source sense tracks separated Use separate tracks for each source sense connection and connect the IC ground to the ground plane on the PCB UM10892 All information provided in this document is subject to legal disclaimers NXP Semiconductors N V 2015 All rights reserved User manual Rev 1 8 July 2015 11 of 16 NXP Semiconductors U M1 0892 TEA1995DB1295 synchronous rectifier controller demo board 10 NXP Semiconductors Power MOSFETs Table 2 gives a selection of NXP Semiconductors MOSFETs that are suited to be used for SR applications The complete Power MOSFET selection guide can be found at www nxp com products mosfets Table 2 Extract from NXP Semiconductors Power MOSFETs Selection Guide Type number Package name Vps max Rpson max at ID max Qan typical Qe tot V VGS 10V A nC typical mQ nC PSMN1R0 40YLD LFPAK56 40 14 100 17 59 PSMN1R4 40YLD LFPAK56 40 1 4 100 13 45
18. ult 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 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 UM10892 All information provided in this document is subject to legal disclaimers 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 for 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

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