UM10526 - NXP Semiconductors
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1. 2012 All rights reserved User manual Rev 1 26 June 2012 14 of 22 NXP Semiconductors U M1 0526 TEA1792TS GreenChip synchronous rectifier controller add on board 5 4 Conducted EMI Tests Test conditions The adapter is subjected to maximum load The ground connection of the output cable is connected to EMC ground e The gate drive resistor R2 value 0 Q Pass criteria CISPR22 Class B inn il 2 WR zi oa kal i T Apu B a aaa 002815 Remark The conducted EMI measurement result for 115 V neutral is comparable to the 115 V line Fig 12 Conducted EMI at 115 V AC line UM10526 All information provided in this document is subject to legal disclaimers NXP B V 2012 All rights reserved User manual Rev 1 26 June 2012 15 of 22 NXP Semiconductors U M1 0526 TEA1792TS GreenChip synchronous rectifier controller add on board aaa 002816 Remark The conducted EMI measurement result for 230 V neutral is comparable to the 230 V line Fig 13 Conducted EMI at 230 V AC line UM10526 All information provided in this document is subject to legal disclaimers NXP B V 2012 All rights reserved User manual Rev 1 26 June 2012 16 of 22 NXP Semiconductors U M1 0526 TEA1792TS GreenChip synchronous rectifier controller add on board 6 Schematic and Bill Of Materials BOM The components used are shown in Figure 14 Table 5 describes2. This document describes the TEA1792TS add on board A functional description and a set of measurements illustrate the performance of the TEA1792TS add on board The add on board also contains a charge pump circuit capable of delivering the supply voltage for the SR controller The charge pump circuit eliminates the auxiliary transformer winding in the flyback convertor A flyback converter board in which the secondary part diode can be replaced by the add on board is required to use the add on board correctly 2 Safety Warning 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 The complete add on 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 The following symbols identify isolated and non isolated devices 019aab173 019aab174 a Isolated b Non isolated Fig 1
3. switch on of the SR MOSFET the input signal on the SRSENSE pin is blanked during the tact sry min 1 8 us typical This action eliminates false switch off due to high frequency ringing at the start of the secondary stroke When the secondary current is reduced until the SRSENSE voltage is Vref the internal control loop maintains the V eg gry level across the MOSFET Maintaining Vreg arv in this instance is achieved when the Vpniygn voltage is decreased This reduction enables the external power switch to be switched off quickly when the current through the switch reaches zero The zero current is detected by sensing a Vdeactiarv 712 mV typical level on the SRSENSE pin The TEA1792TS stops performing synchronous rectification for short pulses which removes the need for a separate Standby mode to maintain high efficiency at low loads SRSENSE DRIVER GND TEA1792TS 5 n c Vcc SELREG aaa 001385 Fig2 Pin configuration TEA1792TS TSOP6 UM10526 All information provided in this document is subject to legal disclaimers NXP B V 2012 All rights reserved User manual Rev 1 26 June 2012 4 of 22 NXP Semiconductors U M1 0526 TEA1792TS GreenChip synchronous rectifier controller add on board 4 General application of the TEA1792TS UM10526 4 1 General application diagrams of high side and low side rectification are given in Figure 3 and Figure 4 See Figure 2 for the relevant pin numbers
4. the components required for the add on board application SEC GND GND SRSENSE DRIVER FRONT GROUND PLANE SOURCE DRAIN GATE aaa 002589 Fig 14 Schematic diagram SR add on board TEA1792DB1074 UM10526 All information provided in this document is subject to legal disclaimers NXP B V 2012 All rights reserved User manual Rev 1 26 June 2012 17 of 22 NXP Semiconductors UM10526 UM10526 TEA1792TS GreenChip synchronous rectifier controller add on board Table 5 Bill of materials Reference Component Package Remark R1 100 kQ 0805 R2 4 7 Q 0805 R3 1 ko 0805 R4 not mounted 0805 S R5 not mounted 0805 R6 not mounted 0805 5 C1 47 nF 50V 0805 C2 1 uF 50V 0805 C3 200 pF 200 V 0805 C4 not mounted 0805 C5 not mounted 0805 D1 BAS321 SOD523 D3 BAV99 SOT23 DZ1 BZX84J C15 SOD323F DZ2 not mounted SOD323F M1 2N7002 SOT23 M2 MOSFET PSMN7R0 100P TO220AB Ron 7 MQ U1 TEA1792TS TSOP6 Components C2 R2 R3 R6 C5 and M2 are needed for the TEA1792TS standard application Components R1 C1 C3 DZ1 D1 D3 and M1 combine to the charge pump circuit The charge pump circuit that generates the supply voltage for the TEA1792TS Mount optional components R4 R5 C4 and DZ2 when false MOSFET switch off occurs False MOSFET switch off occurs when large ringing is present on the tra
5. 3 1 165 90 57 50 49 77 19 304 2 3103 89 61 75 74 11 19 296 3 4722 90 41 100 98 02 19 281 4 6281 91 04 Table 3 Efficiency using STPS20M100S Schottky diode at 115 V 60 Hz Load Pin W Vout V lo A n 26 25 25 29 19 288 1 1634 88 73 50 50 24 19 257 2 3091 88 50 75 75 52 19 242 3 4709 88 44 100 101 33 19 218 4 6262 87 74 Table 4 Efficiency using STPS20M100S Schottky diode at 230 V 50 Hz Load Pin W Vour V lo A n 96 25 25 43 19 288 1 1634 88 24 50 51 56 19 265 2 3091 86 27 75 76 01 19 242 3 4709 87 87 100 100 63 19 218 4 6281 88 35 All information provided in this document is subject to legal disclaimers NXP B V 2012 AII rights reserved User manual Rev 1 26 June 2012 12 of 22 NXP Semiconductors U M1 0526 TEA1792TS GreenChip synchronous rectifier controller add on board aaa 002740 92 efficiency 1 90 2 88 86 25 50 load percentage TEA1792TS SR at 115 V 60 Hz TEA1792TS SR at 230 V 50 Hz STPS20M100S Schottky diode at 115 V 60 Hz STPS20M100S Schottky diode at 230 V 50 Hz Fig 10 Efficiency as a function of percentage load 5 3 Operational Behavior Figure 11 a and Figure 11 b show oscilloscope traces with the typical waveforms The waveforms were measured when the TEA1792DB1074 SR demo board was connected to the 90 W TEA1752 adapter board as a high side application The two waveforms represent the gate d
6. EUN UM10526 PER TEA1792TS GreenChip synchronous rectifier controller add on board Rev 1 26 June 2012 User manual Document information Info Content Keywords TEA1792TS Synchronous Rectifier SR driver high efficiency TSOP6 flyback converter TEA1792DB1074 add on board Abstract This user manual describes how the TEA1792TS add on board can be used in a flyback converter The add on board contains a TEA1792TS SR controller in TSOP 6 package Besides the add on board also contains a power MOSFET as well as a charge pump circuit to generate the supply voltage for the SR controller The add on board replaces the rectifier diode at the secondary side of the flyback converter It is intended for high side applications but with minor modifications it can also be used for low side applications NXP Semiconductors U M1 0526 TEA1792TS GreenChip synchronous rectifier controller add on board Revision history Rev Date Description v 1 20120626 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 UM10526 All information provided in this document is subject to legal disclaimers NXP B V 2012 All rights reserved User manual Rev 1 26 June 2012 2 of 22 NXP Semiconductors U M1 0526 TEA1792TS GreenChip synchronous rectifier controller add on board 1 Introduction
7. Isolated and non isolated symbols UM10526 All information provided in this document is subject to legal disclaimers NXP B V 2012 All rights reserved User manual Rev 1 26 June 2012 3 of 22 NXP Semiconductors U M1 0526 TEA1792TS GreenChip synchronous rectifier controller add on board 3 TEA1792TS SR controller The TEA1792TS is a member of the new generation of Synchronous Rectifier SR controller ICs for switched mode power supplies Its high level of integration allows the design of a cost effective power supply with a very low number of external components The IC provides synchronous rectification on the secondary side for discontinuous conduction mode and quasi resonant mode flyback converters It is a successor to the TEA1791T synchronous rectifier controller IC The TEA1792TS provides improved performance a smaller package option TSOP6 and two different selectable regulation levels An efficient control algorithm built into the IC determines when a MOSFET is switched on or off After a negative voltage lower than Vactidrv C220 mV typical is sensed on the SRSENSE pin the driver output voltage is driven HIGH Then the external MOSFET is switched on When Vsrsense rises to Vreg ary C42 mV 30 mV the driver output voltage is regulated to maintain the Vreg arv on the SRSENSE pin When the SRSENSE voltage is above the Vgeact drv level 12 mV typical the driver output is pulled to ground After
8. TR auxillary Qsec winding mi Vo e primary Secondary winding winding Cyce e VIN RDRIVER RSRSENSE GND SELREG DRIVER PRIMARY Qprim ce Cout SIDE Le A TEA1792 CONTROLLER SRSENSE md aaa 003677 Fig 3 Application diagram for high side rectification VIN mn Vo primary secondary T winding winding D 1 SRSENSE PRIMARY Gorm Osec RSRSENSE SIDE TEA1792 Cout CONTROLLER Fr A A RDRIVER DRIVER aaa 003678 Fig 4 Application diagram for low side rectification In high side rectification Figure 3 the supply voltage for the TEA1792TS is normally derived from an auxiliary winding on the transformer secondary side In low side rectification Figure 4 the output voltage Vout is used in most cases as the TEA1792TS supply High side rectification is the preferred application for the best EMI performance Add on board set up The add on board is designed for incorporation into existing flyback power supplies by replacing the secondary rectifier diode Although the add on board was designed for high side rectifier applications it is also possible to replace the rectifier diode in low side applications The add on board consists of the TEA1792TS in TSOP 6 package e a MOSFET with a typical Ron of 7 mQ acharge pump circuit capable of delivering the SR controlle
9. ard replaces the existing rectifier diode at the secondary side of the flyback supply in high side and low side applications In Figure 7 the internal and external supply options for high side applications are shown Figure 8 shows the possibilities for low side applications NXP B V 2012 All rights reserved 7 of 22 UM10526 All information provided in this document is subject to legal disclaimers User manual Rev 1 26 June 2012 NXP Semiconductors U M1 0526 UM10526 TEA1792TS GreenChip synchronous rectifier controller add on board APBADCO61 Vcc TEA1792 GND SRSENSE DRIVER SEC GND SOURCE DRAIN connect D1 connect B connect remove D1 4 secondary side flyback I aaa 002583 a Internal charge pump supply DRIVER CHARGE PUMP SOURCE connect connect Dt Vout 1 remove D1 I e secondary side flyback aaa 002584 1 PSMN7RO0 100PS see Table 5 b External auxiliary supply Fig 7 TEA1792DB1074 add on board high side connections Figure 7 a shows the connections to be made when the internal charge pump supply is used This charge pump generates a Vcc supply with a value of Vout 2 V The TEA1792TS supply must be between 8 5 V and 38 V see Ref 1 The Vout voltage must be between 10 5 V to 40 V A flyback adapter output voltage is normally within this range All information provided in this d
10. ct 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 9 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 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 Semicondu
11. ctors 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 purposes only NXP Semiconductors makes no representation or warranty that such applications will be suitable for the specified use without further testing or modification UM10526 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 assis
12. e made after stabilization of temperature according to test method for calculating the efficiency of single voltage external AC to DC and AC to AC power supplies of ENERGY STAR 5 2 Efficiency Test conditions The adapter is set to maximum load and preheated until temperature stabilization is achieved Temperature stabilization is established for every load step before recording any measurements Remark The output voltage is measured at the end of the output cable 2 x 20 mQ The arithmetic average of the four efficiency measurements must be 2 87 for adapters to comply with ENERGY STAR EPS2 0 Universal mains adapters must pass the criteria at both 115 V 60 Hz and 230 V 50 Hz To meet this criteria the PFC must be off at 25 load and preferably on at 50 load The performance was measured with and without SR so diode ISO MOSFET All information provided in this document is subject to legal disclaimers NXP B V 2012 All rights reserved User manual Rev 1 26 June 2012 11 of 22 NXP Semiconductors UM10526 UM10526 TEA1792TS GreenChip synchronous rectifier controller add on board Table 1 TEA1792TS efficiency at 115 V 60 Hz Load 76 Pin W Vout V lo A n 26 25 24 78 19 335 1 165 90 90 50 49 09 19 304 2 3103 90 85 75 73 57 19 273 3 4722 90 96 100 98 57 19 25 4 6281 90 38 Table 2 TEA1792TS efficiency at 230 V 50 Hz Load Pin W Vour V lo A n 6 25 24 88 19 34
13. example of the add on board TEA1792DB1074 used in a typical 90 W flyback adapter aaa 002587 Fig 9 Example of add on board TEA1792DB1074 connected to the APBADCO31 TEA1752 90 W flyback adapter NXP B V 2012 All rights reserved 10 of 22 All information provided in this document is subject to legal disclaimers Rev 1 26 June 2012 UM10526 User manual NXP Semiconductors U M1 0526 TEA1792TS GreenChip synchronous rectifier controller add on board 5 Measurements UM10526 5 1 Introduction The performance has been measured on mainboard TEA1752 90 W flyback and PFC see Ref 3 with the add on module TEA1792DB1074 connected for the high side SR 5 1 1 Test equipment and conditions The following test equipment is used AC source Agilent 6812B Power meter Yokogawa WT210 with harmonics option DC electronic load Chroma Model 63103 Digital oscilloscope Yokogawa DL1640L Current probe Yokogawa 701933 30 A 50 MHz 100 MHz high voltage differential probe Yokogawa 700924 500 MHz low voltage differential probe Yokogawa 701920 Multimeter Keithley 2000 ElectroMagnetic Compatibility EMC receiver Rohde amp Schwarz ESPI 3 Line Impedance Standardization Network LISN ENV216 The board was tested under the following conditions Adapter on the lab table with heat sinks facing downwards The adapter has no casing Ambient temperature between 20 C and 25 C Measurements wer
14. 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 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 9 3 Trademarks Notice All refe
15. nsformer secondary side or e a MOSFET with a very low Rason is used See Ref 2 for more detailed information All information provided in this document is subject to legal disclaimers NXP B V 2012 AII rights reserved User manual Rev 1 26 June 2012 18 of 22 NXP Semiconductors U M1 0526 TEA1792TS GreenChip synchronous rectifier controller add on board 7T PCB layout Figure 15 shows the layout of the PCB aaa 002600 Fig 15 PCB layout UM10526 All information provided in this document is subject to legal disclaimers NXP B V 2012 All rights reserved User manual Rev 1 26 June 2012 19 of 22 UM10526 NXP Semiconductors TEA1792TS GreenChip synchronous rectifier controller add on board 8 References TEA1792TS Data sheet GreenChip synchronous rectifier controller 1 AN11149 Application note GreenChip TEA1792 synchronous rectifier controller 2 3 UM10403 User Manual 90 W notebook adapter with TEA1752T and TEA1791T All information provided in this document is subject to legal disclaimers NXP B V 2012 All rights reserved 20 of 22 Rev 1 26 June 2012 UM10526 User manual NXP Semiconductors UM10526 TEA1792TS GreenChip synchronous rectifier controller add on board 9 Legal information 9 1 Definitions Draft The document is a draft version only The content is still under internal review and subje
16. ocument is subject to legal disclaimers NXP B V 2012 AII rights reserved User manual Rev 1 26 June 2012 8 of 22 NXP Semiconductors U M1 0526 UM10526 TEA1792TS GreenChip synchronous rectifier controller add on board When there is an auxiliary voltage available in the flyback adapter application it can be used to supply the TEA1792TS Vcc See Figure 7 b In both situations the MOSFET SOURCE and DRAIN leads are inserted and soldered at the removed diode D1 anode and cathode connections APBADCO61 TEA1792 SRSENSE DRIVER CHARGE PUMP SEC GND remove D1 connect connect connect D1 K secondary side flyback aaa 002585 a Internal charge pump supply APBADC061 i SEC GND SOU xi Vour remove D1 connect connect D1 I secondary side flyback aaa 002586 1 PSMN7RO0 100PS see Table 5 b Vour supply Fig 8 TEA1792DB1074 add on board low side connections All information provided in this document is subject to legal disclaimers User manual NXP B V 2012 AII rights reserved Rev 1 26 June 2012 9 of 22 UM10526 TEA1792TS GreenChip synchronous rectifier controller add on board NXP Semiconductors In low side applications the board is easily connected Using either the internal charge pump supply or with Vour as the supply The required connections are shown in Figure 8 Figure 9 shows an
17. r supply voltage All information provided in this document is subject to legal disclaimers NXP B V 2012 All rights reserved User manual Rev 1 26 June 2012 5 of 22 NXP Semiconductors U M1 0526 UM10526 TEA1792TS GreenChip synchronous rectifier controller add on board Figure 5 shows the top and bottom views of the add on board Only the MOSFET is soldered to the front side of the add on board The MOSFET DRAIN middle pin is soldered to the large copper plane The plane is connected via 15 interconnects to the back side of the add on board All the other SMD components are mounted on the back side ACY12VO N TEES AN Ave Elle N sibs X E AN f APBADCO61 Version 1 0 _GND lt aaa 002578 M2 PSMN7RO0 100PS see Table 5 a Top view C2 D2Z1 D R3 Ur Re ce Mac Im m xia i i MC NL E pin 1 aaa 002579 U1 TEA1792TS see Table 5 b Bottom view Fig 5 TEA1792DB1074 add on board photographs All information provided in this document is subject to legal disclaimers NXP B V 2012 All rights reserved User manual Rev 1 26 June 2012 6 of 22 UM10526 TEA1792TS GreenChip synchronous rectifier controller add on board NXP Semiconductors zr eic E112804 SAN na APBADCO61 Version 1 0 ww oe ONI lt aaa 002599 Fig 6 Add on board dimensions 4 2 Connecting the TEA1792DB1074 add on board The add on bo
18. renced brands product names service names and trademarks are the property of their respective owners GreenChip is a trademark of NXP B V NXP B V 2012 AII rights reserved User manual Rev 1 26 June 2012 21 of 22 NXP Semiconductors UM10526 TEA1792TS GreenChip synchronous rectifier controller add on board 10 Contents po Introduction 000 00 ee eee eee eee 3 Safety Warning 0e cece e eee ees 3 TEA1792TS SR controller 4 General application of the TEA1792TS 5 Add on board set up 0000s 5 Connecting the TEA1792DB1074 add on boald eoe ee Beare nhs oe eR EE 7 Measurements llsslses 11 Introduction 0 0 00 eee ee eee 11 Test equipment and conditions 11 Efficiency 24 35 one paseia ar ide 11 Operational Behavior 13 Conducted EMI Tests 15 Schematic and Bill Of Materials BOM 17 PCB layout 0 2c e cece eee eee 19 References see une 20 Legal information Lese 21 Definitions 2 on Eee ween a 21 Disclaimers vei eRe ee eee ee REE 21 Trademarks 0 0000 cece eee 21 Gontents eee 22 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 Aw
19. rive voltage purple TEA1792TS SR controller DRIVER pin and the secondary output current green The output current was measured using a voltage probe directly connected over a 100 mQ resistor in series with the secondary side ground track Figure 11 a shows the waveforms for a 4 A load with the SELREG pin open This configuration sets the regulation level at 30 mV Figure 11 b shows the waveforms for a 4 A load with the SELREG pin connected to ground This configuration sets the regulation level to 42 mV UM10526 All information provided in this document is subject to legal disclaimers NXP B V 2012 All rights reserved User manual Rev 1 26 June 2012 13 of 22 NXP Semiconductors U M1 0526 UM10526 TEA1792TS GreenChip synchronous rectifier controller add on board YOKOGAWA 2012 02 20 14 28 51 Norm HFRes Stopped 3 E DC Full DC Full ont 5 00 V div 5 00 A div 21 30 V 10 1 100A 1V pcorm aaa 002794 a 4Aload SELREG pin open regulation level 30 mV YOKOGAWA 2012 02 20 14 26 17 Norm H Res Stopped 19 q int 2 5GS s Man 2 Sus div AA AA D Lm A E gm Y oe or M aaa 002814 1 Purple gate drive current 2 Green secondary output current b 4Aload SELREG pin connected to ground regulation level 42 mV Fig 11 TEA1792DB1074 SR and 90 W TEA1752 as a high side application All information provided in this document is subject to legal disclaimers NXP B V
20. tance with 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 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 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
21. ww nxp com For sales office addresses please send an email to salesaddresses nxp com Date of release 26 June 2012 Document identifier UM10526
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