UM10371 STARplug buck and buck-boost converter demo board
Contents
1. 019aab926 Fig 6 STARbuck with default PCB population 5 V output buck IC1 DRAIN AUX zo toe Vcc TEA152x C7 R4 R6 REG os GND SOURCE R2 c3 R3 C4 R5 R7 L2 4 e J3 JP1 J2 4 5 5 ce Nos 019aab927 Fig 7 STARbuck in Buck boost mode 5 V output buck boost UM10371 All information provided in this document is subject to legal disclaimers NXP B V 2011 All rights reserved User manual Rev 2 4 May 2011 13 of 21 NXP Semiconductors UM10371 STARplug buck and buck boost converter demo board STARbuck R1 D1 L1 Jiz Sy IC1 DRAIN AUX JP3 D4 V j c2 CC wr 152 R4 R6 REG os GND SOURCE R2 C3 4 R5 R7 L2 C J3 2 J2 n 4 5 0 4 n J4 019aab928 Fig 8 _STARbuck with externally powered Vcc 12 V output buck R1 01 L1 J1 gt PH IC1 DRAIN AUX o0 Tc Voc R8 TEA152x ZX 05 R4 R6 REG os GND SOURCE R2 C3 R3 C4 R5 R7 L2 4 41 4 lt J3 E 2 J22. lille 20 11 2 20 11 3 20 12 eee 21 Please be aware that important notices concerning this document and the product s described herein have been included in section Legal information B V 2011 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 4 May 2011 Document identifier UM10371
3. Table 5 shows the Ipsimax values that are tolerable for the respective TEA152x family members Table 5 STARplug IC family members current capability STARplug family Ips max Maximum STARbuck Lowest tolerable R3 member output current lo value TEA1520T 250 mA 125 mA 20 TEA1521T 500 mA 250 mA 10 TEA1522T 1000 mA 500 mA 0 50 The L2 inductor value and current capability must be adapted to meet the requirements of higher current outputs Guidelines can be found in the 00055 STARplug application note A small output voltage limiting diode BZX384 in the D3 position is sufficient for low output power STARbuck versions If such a small Zener diode in the D3 position becomes too hot the STARbuck PCB has a provision for mounting an SMA sized Zener diode e g Vishay BZGO03 in the same position The value of the inrush current reduction resistor must be adapted Table 6 gives suggested values for various conditions All information provided in this document is subject to legal disclaimers NXP B V 2011 All rights reserved User manual Rev 2 4 May 2011 11 of 21 NXP Semiconductors U M1 0371 STARplug buck and buck boost converter demo board STARbuck Finally it is suggested to adapt the value of the C1 and C2 reservoir capacitors See Table 7 The values proposed in Table 6 and Table 7 are not the optimal values for an end application but these values should work fine for the initial evaluation
4. 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 11 3 Trademarks Notice All referenced brands product names service names and trademarks are the property of their respective owners STARplug is a trademark of
5. 0 Hz 31 6 50 6 39 3 96 50 2 96 55 4 96 57 5 96 230 V 50 Hz 31 6 40 1 96 30 7 96 37 5 96 44 0 96 48 4 96 12 V 1 W STARbuck 115 V 60 Hz 62 2 80 6 96 78 3 96 79 9 96 83 0 96 81 2 96 230 V 50 Hz 62 2 75 7 69 2 74 5 96 79 1 96 80 1 96 12 V 4 W STARbuck 115 V 60 Hz 70 9 80 5 96 80 0 96 82 6 96 80 9 96 78 6 230 V 50 Hz 70 9 78 6 96 74 0 96 78 6 96 80 8 96 80 9 Remark Warm up time is 15 minutes UM10371 Settle time after the load change is 90 s All information provided in this document is subject to legal disclaimers NXP B V 2011 All rights reserved User manual Rev 2 4 May 2011 5 of 21 NXP Semiconductors U M1 0371 STARplug buck and buck boost converter demo board STARbuck 4 3 Electro Magnetic Compatibility EMC performance data MJ o gt zi lt x H x 5 T P e ih mn M ub m E E lan ACA aiti M REN Fig 2 Conducted EMC test Viy 115 V AC Vout 5 V Po 500 mW USE illi ii Mi T il _ Peto E r E y z lt z3x M muli NN m TE aa _ 1M 019aab923 Fig 3 Conducted EMC test Vi 230 V AC Vout 5 V Po 500 mW UM10371 formation provided in this document is subject to legal disclaimers 201
6. 1 All rights reserved User manual Rev 2 4 May 2011 6 of 21 NXP Semiconductors U M1 0371 STARplug buck and buck boost converter demo board STARbuck Both the average and quasi peak EMC performance of the STARbuck demo board meet the requirements of EN55022 5 Connection of the demo board UM10371 Vout J3 live J1 GND 0 V J4 neutral J2 019aab924 Fig 4 Demo board connections set up Buck mode jumper JP2 mounted In Buck mode J2 neutral is connected to J4 GND The output voltage Vout on J3 has a positive polarity with respect to GND All information provided in this document is subject to legal disclaimers NXP B V 2011 All rights reserved User manual Rev 2 4 May 2011 7 of 21 NXP Semiconductors U M1 0371 UM10371 STARplug buck and buck boost converter demo board STARbuck GND 0 V J3 live J1 neutral J2 019aab925 Vout J4 Fig 5 Demo board connections set up Buck boost mode jumper JP1 mounted In Buck boost mode J2 neutral is connected to J3 GND The output voltage Vout on J4 has a negative polarity with respect to GND All information provided in this document is subject to legal disclaimers NXP B V 2011 All rights reserved User manual Rev 2 4 May 2011 8 of 21 NXP Semiconductors U M1 0371 STARplug buck and buck boost converter demo board STARbuck 6 Circuit description U
7. 4 4 SA 4 4 J4 019aab929 Fig 9 STARbuck Vcc spike protection 12 V output buck UM10371 All information provided in this document is subject to legal disclaimers NXP B V 2011 All rights reserved User manual Rev 2 4 May 2011 14 of 21 NXP Semiconductors U M1 0371 STARplug buck and buck boost converter demo board STARbuck R1 D1 Ji BI IC1 DRAIN AUX o TEA152x C7 R4 R6 REG C5 GND SOURCE R2 c3 R3 C4 R5 R7 L2 4 e J3 2 2 5 4 i i C J4 019aab930 Fig 10 STARbuck with reduced EMI filtering UM10371 All information provided in this document is subject to legal disclaimers NXP B V 2011 All rights reserved User manual Rev 2 4 May 2011 15 of 21 NXP Semiconductors UM10371 STARplug buck and buck boost converter demo board STARbuck 9 Component lists UM10371 Table 8 Default component list Reference Component Package IC1 NXP Semiconductors TEA1520T 5014 D1 Vishay S1M DO214 AC D2 Vishay FR1J DO214 AC 0301 Vishay BZG03C5V6 DO214 AC D3 A NXP BZX384C5V6 SOD323 D4 Vishay FR1J DO214 AC L1 inductor ELCO6D 1 mH z L2 inductor ELCO6D 1 mH C1 2 2 uF 400 V elcap radial 2E C2 2 2 uF 400 V elcap radial 2E C3 330 pF 50 V 0805 C4 5 6 nF 50 V 0805 C5 100 nF 50V 0805 C6 220 uF 16 V elc
8. D jumper 1206 1 Not mounted Table 11 Component list modification for externally powered Vcc with spike protection Reference Component Package Remarks IC1 NXP Semiconductors TEA1522T SO14 D2 Vishay BYG20J DO214 AC D3 A NXP Semiconductors BZX384C13 SOD323 D4 Vishay BYG20J DO214 AC D5 NXP Semiconductors BZX384C27 500323 mount in C7 position L2 inductor 390 uH lj gt 400 mA DC Isat gt 800 mA C5 330 nF 50 V 0805 1206 R3 0 68 0 25 W 1206 R4 16 0805 R5 4 3 0805 R8 100 1206 mount in JP3 position JP3LU 0 SMD jumper 1206 1 Not mounted Table 12 Component list modification for reduced EMI filtering Reference Component Package Remarks 110 c20 radial 2E JP4 Wire bridge jumper mount in L1 position 1 Not mounted UM10371 All information provided in this document is subject to legal disclaimers NXP B V 2011 All rights reserved User manual Rev 2 4 May 2011 17 of 21 NXP Semiconductors U M1 0371 STARplug buck and buck boost converter demo board STARbuck 10 Printed circuit board UM10371 The STARbuck SMPS printed circuit board is a single sided board Dimensions are 34 x 31 mm The demo boards are produced on 1 6 mm FR4 with single sided 35 um copper 1 Oz FR2 could also be used as the PCB material The PCB can be configured to provide a number of NXP Semiconductors STARbuck SMPS implementations W
9. M10371 6 1 6 2 6 3 The default STARbuck demo board consists of a single phase half wave rectifier circuit a filtering section a switching section an output section and a feedback section The full default circuit diagram implemented on the STARbuck demo board PCB is shown in Figure 6 Rectification section The single phase half wave rectifier consists of a single diode D1 Capacitor C1 functions as a reservoir capacitor for the rectified input voltage The inrush current is limited by resistor R1 Connectors J1 live and J2 neutral connect the input to the electricity utility network Swapping live and neutral however does not have any effect on the operation of the STARbuck converter The half wave rectifier circuit allows the neutral terminal to have the same potential level as the GND terminal This enables the triacs and SCRs to be driven from a logic circuit powered by the STARbuck SMPS This is for example a common approach in white goods applications that do not require AC mains supply isolation Filtering section The filtering section which consists of L1 and C2 effectively reduces the noise and harmonic content that would otherwise be injected from the TEA152x switching electronics into the electricity utility network This circuit aids in achieving the EMC performance required by EN55022 Switching section The switching section uses a standard NXP Semiconductors STARplug TEA152xT IC in an SO14 package Th
10. NO0055 for more detailed accurate information on the operation of STARplug TEA152x and the dimensioning of STARplug circuits 7 Alternative circuit options 7 1 7 2 UM10371 Buck boost converter circuit Instead of implementing a buck converter as shown in Figure 6 a buck boost converter circuit can be realized by removing jumper JP2 and mounting jumper JP1 Note the required wiring diagram changes see Section 5 The output voltage has a negative polarity with respect to GND See the circuit diagram shown in Figure 7 and the component changes in Table 9 Buck or buck boost converter with an output voltage gt 10 V When the output voltage of the buck or buck boost converter is above 10 V the output voltage can simultaneously be used to supply the internal electronics of the TEA152x IC through its Vcc A provision is made on the STARbuck demo board PCB enabling jumper JP3 1206 SMD jumper to be mounted so that it connects the feedback voltage across C5 to the IC Voc pin All information provided in this document is subject to legal disclaimers NXP B V 2011 All rights reserved User manual Rev 2 4 May 2011 10 of 21 NXP Semiconductors U M1 0371 UM10371 7 3 7 4 STARplug buck and buck boost converter demo board STARbuck When the Vcc pin is powered externally the internal JFET current source stops operating saving a considerable amount of power When jumper JP3 is mounted the capacito
11. NXP B V NXP B V 2011 All rights reserved User manual Rev 2 4 May 2011 20 of 21 NXP Semiconductors U M1 0371 STARplug buck and buck boost converter demo board STARbuck 12 Contents 1 Introduction 3 2 Features RR RR 3 3 Technical specifications 4 4 Performance data 4 4 1 Output voltage and no load power consumption 4 4 2 Efficiency performance data 5 4 3 Electro Magnetic Compatibility EMC performance 6 5 Connection of the demo board 7 6 Circuit 9 6 1 Rectification 5 9 6 2 Filtering section 9 6 3 Switching section 9 6 4 Output section 10 6 5 Feedback lt 10 7 Alternative circuit options 10 7 1 Buck boost converter circuit 10 7 2 Buck or buck boost converter with an output voltage gt 10 10 7 8 Vcc voltage spike suppression 11 7 4 Increased current capability 11 7 5 Reduced EMI filtering 12 8 Schematics 2 err nun 13 9 Component 1 16 10 Printed circuit board 18 11 Legal information 20 11 1 Definitions
12. UM10371 STARplug buck and buck boost converter demo board STARbuck Rev 2 4 May 2011 User manual Document information Info Content Keywords STARplug buck converter buck boost converter white goods non isolated SMPS Abstract The NXP Semiconductors STARbuck demo board is a flexible user configurable non isolated SMPS application intended for low power loads STARbuck has a universal mains input and a single positive or negative DC voltage output This manual describes the STARbuck demo board version 1 0 Refer to the TEA152x data sheet for details on the STARplug device and the STARplug application note AN00055 for general application information NXP Semiconductors U M1 0371 STARplug buck and buck boost converter demo board STARbuck Revision history Rev Date Description v 2 20110504 second issue v 1 20100407 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 UM10371 All information provided in this document is subject to legal disclaimers NXP B V 2011 All rights reserved User manual Rev 2 4 May 2011 2 of 21 NXP Semiconductors U M1 0371 STARplug buck and buck boost converter demo board STARbuck 1 Introduction WARNING Lethal voltage and fire ignition hazard The non insulated high voltages that are present when operating this produc
13. ap radial 1E C7 220 nF 50 V 1206 R1 47 Q 0 5 W carbon film radial 1E R2 7 5 0805 R3 2 2 Q 0 25 W 1206 R4 5 6 0805 R5 5 6 KQ 0805 R6 200 1206 R7 200 1206 JP1L 0 Q SMD jumper 1206 JP2 0 SMD jumper 1206 0 SMD jumper 1206 J1 J2 2 pole terminal block 2E pitch J3 J4 2 pole terminal block 2E pitch Remarks e g Murata 22R105C e g Murata 22R105C maximum diameter 10 5 mm maximum diameter 10 5mm maximum diameter 8 mm mounted upright Phoenix 1729128 Farnell 304 1440 Phoenix 1729128 Farnell 304 1440 1 Not mounted Table 9 Component list modification for buck boost converter option Reference Component Package JP1 0 SMD jumper 1206 201 0 O SMD jumper 1206 Remarks 1 Not mounted All information provided in this document is subject to legal disclaimers NXP B V 2011 All rights reserved User manual Rev 2 4 May 2011 16 of 21 NXP Semiconductors U M1 0371 STARplug buck and buck boost converter demo board STARbuck Table 10 Component list modification for externally powered Vcc Reference Component Package Remarks IC1 NXP Semiconductors TEA1522T SO14 D2 Vishay BYG20J DO214 AC D3 A NXP BZX384C13 SOD323 D4 Vishay BYG20J DO214 AC L2 inductor 390 uH lj gt 400 mA DC Isat gt 800 mA C5 330 nF 50 V 0805 1206 R3 0 68 Q 0 25 W 1206 R4 16 0805 R5 4 3 0805 0 SM
14. bject to legal disclaimers NXP B V 2011 All rights reserved User manual Rev 2 4 May 2011 3 of 21 NXP Semiconductors UM10371 STARplug buck and buck boost converter demo board STARbuck User configurable output voltage range between 5 V and 36 V User configurable maximum output current set using resistor R3 TEA1520T up to 125 mA maximum output power 2 5 W TEA1521T up to 250 mA maximum output power 5 W TEA1522T up to 500 mA maximum output power 10 W High efficiency at higher output voltages only TEA1520T 12 V 1 W typical efficiency gt 75 96 TEA1522T 12 V 4 W typical efficiency 78 96 Very low standby no load power at higher output voltages only TEA1520T 12 V 1 W typical standby power 40 mW TEA1522T 12 V 4 W typical standby power 65 mW Overload protection OverTemperature Protection OTP Built in ElectroMagnetic Interference EMI filter 3 Technical specifications Table 1 Input specification Parameter Condition Value Remark input voltage 80 to 276 V AC universal mains input frequency 47 to 63 Hz Table 2 Output specification Parameter Condition Value Remark output voltage 5V user changeable output voltage at 75 load 5 tolerance output voltage stability 5 V output 15 5 96 over full power range at 12 V output 10 5 over full power range 4 Performance data UM10371 4 1 Out
15. e operating frequency is set by the combination of R2 and C3 Resistor R3 limits the peak current that can occur in the STARplug internal MOSFET switch and consequently in inductor L2 The current limitation simultaneously prevents the internal MOSFET switch from being overstressed the maximum switch current is given in Equation 1 and the output current of the SMPS from exceeding the value in Equation 2 In this way a programmable overload protection is built into the application 0 5 R3 1 0 25 R3 2 At low DC output voltages Vout lt 10 V the STARplug IC must provide its own operating voltage supply Vcc It does this using the internal JFET current source built into the TEA152x family of ICs by buffering the supply voltage on the Vcc pin pin 1 using a 220 nF capacitor C7 Remark This way of generating the Vcc supply voltage has negative consequences for the total efficiency and for the no load power consumption of the SMPS However for low output voltages there is no straightforward solution that is more efficient and economically feasible All information provided in this document is subject to legal disclaimers NXP B V 2011 All rights reserved User manual Rev 2 4 May 2011 9 of 21 NXP Semiconductors U M1 0371 6 4 6 5 STARplug buck and buck boost converter demo board STARbuck The AUX pin of the IC pin 8 receives information regarding the magnetization status of
16. ith the default component population a tiny 5 V 100 mA power supply is created The same PCB can be used however to create a 12 V 350 mA or even a 24 V 400 mA non isolated SMPS The Gerber File set for the production of the PCB is available from NXP Semiconductors Normally the bottom silk is not used for PCB production it is only a component position reference NYO STARbuck Version 1 0 019aab931 Fig 11 Top silk screen top view 019aab932 Fig 12 Bottom silk screen bottom view All information provided in this document is subject to legal disclaimers NXP B V 2011 All rights reserved User manual Rev 2 4 May 2011 18 of 21 NXP Semiconductors UM10371 UM10371 STARplug buck and buck boost converter demo board STARbuck O m xonquvis zd 019aab933 ls Fig 13 Bottom copper bottom view 019aab934 Fig 14 Bottom solder mask bottom view All information provided in this document is subject to legal disclaimers NXP B V 2011 All rights reserved User manual Rev 2 4 May 2011 19 of 21 NXP Semiconductors UM10371 STARplug buck and buck boost converter demo board STARbuck 11 Legal information 11 1 Definitions Draft The document is a draft version only The content is still under inter
17. nal 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 11 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 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 d
18. ocument 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 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 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 UM10371 All information provided in this document is subject to legal disclaimers design It is customer s sole responsibility to determine whether the NXP Semiconductors prod
19. of a STARbuck application Remark It is recommended to carry out the proper calculations for the specific STARbuck implementation for an end application Table 6 Suggested R1 inrush current limiting resistor values Input voltage Output power Po Vin 1W 2w AW 7W 10W 115 V AC 470 47 330 220 220 230 V AC 47 47 47 330 330 Remark The H1 resistor must be a carbon film type A metal film resistor could act as a fuse instead of an inrush current limiter Table 7 Suggested C1 and C2 reservoir capacitor values Input voltage Output power Po Vin 1W 2w AW 7W 10W 115 V AC 2 2 uF 2 2 uF 4 7 uF 6 8 uF 10 pF 230 V AC 2 2 uF 2 2 uF 2 2 uF 4 7 uF 6 8 uF 7 5 Reduced EMI filtering Applications that do not require a high level of EMI filtering can eliminate the L1 and C2 components from the STARbuck demo board PCB further reducing the cost The L1 inductor must be replaced with a wire bridge See the circuit diagram shown in Figure 10 and the component changes shown in Table 12 UM10371 All information provided in this document is subject to legal disclaimers NXP B V 2011 All rights reserved User manual Rev 2 4 May 2011 12 of 21 NXP Semiconductors UM10371 8 Schematics STARplug buck and buck boost converter demo board STARbuck Jt PH TEA152x SO R3 C7 URCE J3 J4 J2
20. put voltage and no load power consumption Table 3 shows the no load power consumption figures for three implementations of the STARbuck SMPS TEA1520T 5 V 100 mA 500 mW the default implementation on the demo board TEA1520T 12 V 83 mA 1 W TEA1522T 12 V 333 mA 4 W All information provided in this document is subject to legal disclaimers NXP B V 2011 All rights reserved User manual Rev 2 4 May 2011 4 of 21 NXP Semiconductors UM10371 STARplug buck and buck boost converter demo board STARbuck Table 3 No load output voltage and power consumption values Power supply Energy start 2 0 requirement 5 V 500 mW STARbuck 115 V 60 Hz lt 300 mW 230 V 50 Hz 300 mW 12 V 1 W STARbuck 115 V 60 Hz 300 mW 230 V 50 Hz lt 300 mW 12 V 4 W STARbuck 115 V 60 Hz lt 300 mW 230 V 50 Hz lt 300 mW Output voltage Vout 5 6 V 5 6 V 13 0 V 13 0 V 13 0V 13 0V Power consumption Pi 160 mW 300 mW 30 mW 40 mW 30 mW 65 mW 4 2 Efficiency performance data Table 4 shows the efficiency figures for three implementations of the STARbuck SMPS TEA1520T 5 V 100 mA 500 mW the default implementation on the demo board TEA1520T 12 V 83 mA 1 W TEA1522T 12 V 333 mA 4 W Table 4 Efficiency values Power Energy star Efficiency n supply requirement average 25 1 50 load 75 load 100 load 5 V 500 mW STARbuck 115 V 6
21. rs C5 and C7 are operate completely in parallel This makes it possible to eliminate C7 if the value of C5 is increased Table 3 shows that the no load power consumption drops drastically when compared to the situation where the output voltage is too low to mount JP3 see Table 3 The efficiency is also increased significantly when this circuit option is implemented The circuit diagram shown in Figure 8 and the component changes indicated in Table 10 show a STARbuck application with 12 V output voltage and a maximum output current of 350 mA Vcc voltage spike suppression When the STARplug Vcc pin is powered externally harsh environments may induce voltage spikes on the Vcc pin via the output section of the STARbuck circuit A voltage spike above 40 V can damage the STARplug IC Voltage spikes can be suppressed by mounting a Zener diode D5 in the position of C7 and replacing JP3 with a small 10 Q 1206 sized resistor R8 See the circuit diagram in Figure 9 and the component changes in Table 11 Increased current capability As described in Section 6 3 both the maximum current through the STARplug s internal MOSFET and the SMPS maximum output current can be programmed by changing the R3 resistor value Equation 1 and Equation 2 show the relationships Care must be taken that the programmed maximum drain source current value does not exceed the maximum current capability of the TEA152xT device that is mounted on the PCB
22. t 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 STARbuck Switched Mode Power Supply SMPS demo board has one single non isolated DC output voltage The circuit is built around an NXP Semiconductors STARplug IC and the operation mode of the circuit is either buck or buck boost The default configuration on the STARbuck demo Printed Circuit Board PCB implements Buck mode operation and produces 5 V DC 100 mA maximum on the output terminals However by changing the jumper settings modifying the component values or swapping the components the STARbuck demo board can be adapted easily to meet specific needs with respect to the output voltage and the output current 019aab921 Fig 1 STARbuck demo board 2 Features Universal mains input Single DC voltage output Non isolated AC mains supply Neutral terminal connected to 0 V GND DC output terminal Produces either a positive polarity in Buck mode or a negative polarity voltage in Buck boost mode No custom made magnetic components required uses only standard components UM10371 All information provided in this document is su
23. the inductor L2 via the two resistors R6 and R7 The resistor was divided in to two parts because of the relatively high voltage that can appear across R6 R7 Output section The output section of the STARbuck application consists of D2 L2 C6 and D3 Jumpers JP1 and JP2 1206 SMD jumpers are used to select either the Buck mode or Buck boost mode as the operating mode The freewheel diode D2 acts as the lower switch in the buck or buck boost converter L2 is the primary energy storage element of this application and C6 buffers the output voltage and reduces output voltage ripple The Zener diode D3 prevents the output of the SMPS rising too high above the nominal programmed output voltage under low load or no load conditions This unwanted voltage increase is a consequence of the switching spikes that occur in the Switching section This can be effectively countered using a low power Zener diode Feedback section The feedback section consists of D4 C5 R4 R5 and C4 With diode D4 and capacitor C5 the voltage across C6 Vout is more or less copied and level shifted to the C5 voltage Resistors R4 and R5 form a voltage divider with an output to the STARplug REG pin pin 7 The programmed output voltage of the STARbuck SMPS is given in Equation 3 25 R4 R5 V ous RS 3 Capacitor C4 acts as a noise suppressor in the feedback regulation circuit and adds a pole to the feedback loop Refer to the STARplug application note A
24. uct 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 national 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
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