4 W non-isolated, wide input-voltage range SMPS demonstration
Contents
1. ky UM0920 YZ User manual 4 W non isolated wide input voltage range SMPS demonstration board based on the VIPer16 Introduction The purpose of this document is to provide information for the STEVAL ISA071V2 switched mode power supply SMPS demonstration board The STEVAL ISA071V2 is a non isolated SMPS capable of delivering a 4 W output over a wide input voltage range and is designed for a mains application requiring 5 V and 7 V referred to neutral The basic concepts used in this design can also be applied for higher power outputs or different voltage ranges The SMPS generates outputs of 5 V and 12 V referred to the output marked 5 V The 5 V is dedicated to supplying an MCU This configuration allows the use of the MCU to directly drive a Triac referred to neutral The 12 V output is used to supply additional circuits relays OA etc This document contains a fundamental technical description of the demonstration board schematic diagram PCB details and bill of materials and basic measurements load regulation efficiency standby behavior and EMI data Figure 1 STEVAL ISA071V2 board May 2012 Doc ID 17220 Rev 2 1 14 www st com www BDTIC com ST Contents UM0920 Contents 1 Main characteristics 2222 0 eee ee 4 2 Board connections Xa ced caw se te Bae eee a eee eae ee 5 3 Board details 000 ccc ee ee ee eee 6 3 1 Schematic diagram 22c6022tcwehedeneeuas KG beat eo deeds ADA2. R1 This component reduces the inrush current caused by connection of the SMPS to mains charging current of bulk capacitors or by surge pulses EMI filter L1 C4 C5 This basic EMI filter using bulk capacitors and a simple inductor can be applied due to the single rectifier Input bulk capacitors C4 C5 These capacitors store energy when the input AC voltage is low The flyback converter consists of VIPer16 U1 This device integrates a controller and high voltage power MOSFET in one package The controller works in current mode with a fixed frequency in discontinuous mode Thanks to the built in error amplifier the VIPer16 can directly sense the output voltage via a voltage divider Mandatory components for proper operation of the VIPer16 are Vpp capacitor C10 and compensation network R4 C8 and C9 Diode D1 is not mandatory but it connects the output voltage to Voc of the Viper16 reducing standby consumption Peak clamp D5 R2 R7 C2 This circuit absorbs energy from the voltage spike present after MOSFET turn off This spike is generated by leakage inductance of the transformer Secondary side D2 D4 C1 C7 This consists of two rectifiers and capacitors for each output The 5 V output is used for feedback regulation The main benefit of this solution is the connection of the source of the VIPer16 to 5 V This allows direct sensing of 5 V from the output and simplifies the circuit Another benefit of this meth
3. data Single sided 35 um FR4 33x45 mm effective size of SMPS circuitry e Isolation non isolated N connected to output GND EMI compliant with EN55022 Class B 4 14 Doc ID 17220 Rev 2 ki www BDTIC com ST Board connections UM0920 2 Board connections The STEVAL ISA071V2 demonstration board is pictured in Figure 2 below with input and output locations Figure 2 Input output connection of SMPS 5V 7V GND AC input ky Doc ID 17220 Rev 2 5 14 www BDTIC com ST UM0920 STEVAL ISA071V2 circuit schematic A schematic diagram of the non isolated flyback converter board prototype based on the Board details Schematic diagram VIPer16 is provided in Figure 3 below Figure 3 ZAZ6800WV Lr A 007 N 007 AN OL AN OL Y e mv A 79c NG8 M 2 0 cg yndjno r ano St S at Vk omm OOLHLSdLS cd eK dq 4 HW dc LOOVNL ZLOOPNI VT eq 9d LVIYANWNL gt Ld Board details 3 3 1 Doc ID 17220 Rev 2 www BDTIC com ST 6 14 UM0920 Board details 3 2 Description of main components The complete converter application consists of an input section and the flyback converter itself The input section contains Single diode rectifier D3 D6 The single diode rectifier is selected to allow simple connection of neutral to GND and reduce components count Inrush current limiter
4. CB is 41 x 58 mm and the PCB space occupied by electronic circuitry is 33 x 45 mm The layout of the PCB is provided in Figure 4 8 14 Doc ID 17220 Rev 2 ky www BDTIC com ST UM0920 Board details Figure 4 PCB layout top layer bottom SMD layer and bottom copper layer Si AN R amp RS BJ I Dot ZIP xD w2 oon FE or D m OHYDE ND 39 17DA HOIH ONINYYM Doc ID 17220 Rev 2 9 14 www BDTIC com ST Board details UM0920 3 5 Bill of materials Table 2 Bill of materials Number Quantity Ref FADE SEERE part Package class Manufacturer 1 1 R1 22 Q 2W 5 2 2 R2 R7 200 kQ 5 1206 3 1 R3 4 7 kQ 1 0 1 W 0805 4 1 R4 4 7 kQ 5 0 1 W 0805 5 1 R6 9 1kQ 1 0 1 W 0805 6 2 C1 C7 100 uF 25 V 105 C D8 RM 5 Rubycon 7 1 C2 1 nF 500 V 1206 8 2 C4 C5 10 HF 400 V 105 C D10 x 20 RM 5 9 1 C8 1 nF 50V 0805 10 1 C9 100nF 50V 0805 11 1 C10 10 pF 35 V 105 C 12 1 L1 2 2 mH 80 mA 13 1 Ti EF16 T5684 51 01 EPCOS 14 1 D1 TMMBAT41 SOD80 15 1 D2 STPS1H100 SMA STMicroelectronics 16 2 D3 D6 SMD 1N4007 MELF SMA 17 1 D4 STPS1L60 SMA STMicroelectronics 18 1 D5 STTH1L06 SMA STMicroelectronics 19 1 U1 VIPER16 DIP 7 STMicroelectronics 20 1 Ji Screw terminal 2 pos RM 5 mm 21 1 J2 Screw terminal 3 pos RM 5 mm 10 14 Doc ID 17220 Rev 2 ST www BDTIC com ST UMO 920
5. E APPLICATIONS AT USER S OWN RISK Resale of ST products with provisions different from the statements and or technical features set forth in this document shall immediately void any warranty granted by ST for the ST product or service described herein and shall not create or extend in any manner whatsoever any liability of ST ST and the ST logo are trademarks or registered trademarks of ST in various countries Information in this document supersedes and replaces all information previously supplied The ST logo is a registered trademark of STMicroelectronics All other names are the property of their respective owners 2012 STMicroelectronics All rights reserved STMicroelectronics group of companies Australia Belgium Brazil Canada China Czech Republic Finland France Germany Hong Kong India Israel Italy Japan Malaysia Malta Morocco Philippines Singapore Spain Sweden Switzerland United Kingdom United States of America www st com 14 14 Doc ID 17220 Rev 2 ky www BDTIC com ST
6. M edad 6 3 2 Description of main components cee eee eee 7 3 3 Transformer o 55 27505 aaa mata Ge ee Sade a ec la wa Wika baa 8 3 4 PCB details and layout 2 25 200 000005s000eeasseeteass tauren bee 8 3 5 Bill of materials 0 0 0 ee ee ee eee 10 4 Measurements 02000 c eee eee ee eee ee ee ees 11 5 Revision history 26s cck na sede e eee eee eee ee 13 2 14 Doc ID 17220 Rev 2 ky www BDTIC com ST UM0920 List of figures List of figures Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Figure 7 Figure 8 STEYAL ISA07 1V2 board soi ck GB ade bande be KA sh we eka BAR kad 1 Input output connection of SMPS 2 2 2 eee 5 STEVAL ISA071V2 circuit schematic 00 cee 6 PCB layout top layer bottom SMD layer and bottom copper layer 9 Efficiency at 120 VAC and 230 VAC 1 2 11 Load characteristics of 12 V output at 120 VAC and 230 VAC 2 24 11 EMI measurement for EN55022 Class B AVG detector 00 2000055 12 EMI measurement for EN55022 Class B peak detector 12 Doc ID 17220 Rev 2 3 14 www BDTIC com ST Main characteristics UM0920 1 Main characteristics e Input Vin 85 264 Vans f 45 66 Hz e Output 12 VDC 10 referred to 5 V 160 mA 5VDC 4 400 mA Max output power 4 W range is up to 6 W for EU e Standby power 35 mW at 230 VAC e Short circuit protected PCB
7. Measurements 4 Measurements The basic measurements for efficiency load characteristics and conductive EMI are shown in Figure 5 Figure 6 Figure 7 and Figure 8 Figure 5 Efficiency at 120 VAC and 230 VAC ai Standby at 120 VAC 20 mW Salon Standby at 230 VAC 35 mW 80 00 80 00 SL 60 00 SL 60 00 o 50 00 amp 50 00 40 00 40 00 2 o 30 00 30 00 Lul Lul 20 00 20 00 10 00 10 00 0 00 0 00 0 00 0 50 1 00 1 50 2 00 2 50 3 00 3 50 4 00 0 00 0 50 1 00 1 50 2 00 2 50 3 00 3 50 4 00 Pout W Pout W AM00898 Figure 6 Load characteristics of 12 V output at 120 VAC and 230 VAC de 120 VAC je 230 VAC 5V 50 mA 5V 50 mA 1G 5V 100mA 5V 100 mA 5V 200 mA _ 5V 200 mA S n 5V 400m S 5V 400 mA 5 13 3 13 Pi 12 12 11 11 10 10 0 20 40 60 80 100 120 140 160 180 mA l mA OUT OUT AM00899 ST Doc ID 17220 Rev 2 11 14 www BDTIC com ST Measurements UM0920 Figure 7 EMI measurement for EN55022 Class B AVG detector Agilent 18 10 40 Mar 3 2010 Mkr1 209 892 kHz Ref 75 dBi Atten 10 dB 4 542 dBu Avg Log 10 dB OKT W1 S2 S3 FS AA Start 150 kHz Stop 30 MHz
8. Res BW 1 kHz VBW 10 kHz Sweep 47 35 s 1515 pts Figure 8 EMI measurement for EN55022 Class B peak detector Agilent 19 03 44 Mar 3 2010 Mkr1 209 892 kHz Ref 75 dBu Atten 10 dB 10 06 dBi Avg T Log dB III l W1 s2 S3 FS AA Start 150 kHz Stop 30 MHz Res BW 9 kHz VBW 30 kHz Sweep 1 356 s 1515 pts 12 14 Doc ID 17220 Rev 2 a www BDTIC com ST UM0920 Revision history 5 Revision history Table 3 Document revision history Date Revision Changes 28 Jun 2010 1 Initial release 03 May 2012 Replaced STEVAL ISA071V1 by STEVAL ISA071V2 updated Figure 1 to Figure 4 and Disclaimer minor text corrections throughout document Doc ID 17220 Rev 2 13 14 www BDTIC com ST UM0920 Please Read Carefully Information in this document is provided solely in connection with ST products STMicroelectronics NV and its subsidiaries ST reserve the right to make changes corrections modifications or improvements to this document and the products and services described herein at any time without notice All ST products are sold pursuant to ST s terms and conditions of sale Purchasers are solely responsible for the choice selection and use of the ST products and services described herein a
9. nd ST assumes no liability whatsoever relating to the choice selection or use of the ST products and services described herein No license express or implied by estoppel or otherwise to any intellectual property rights is granted under this document If any part of this document refers to any third party products or services it shall not be deemed a license grant by ST for the use of such third party products or services or any intellectual property contained therein or considered as a warranty covering the use in any manner whatsoever of such third party products or services or any intellectual property contained therein UNLESS OTHERWISE SET FORTH IN ST S TERMS AND CONDITIONS OF SALE ST DISCLAIMS ANY EXPRESS OR IMPLIED WARRANTY WITH RESPECT TO THE USE AND OR SALE OF ST PRODUCTS INCLUDING WITHOUT LIMITATION IMPLIED WARRANTIES OF MERCHANTABILITY FITNESS FOR A PARTICULAR PURPOSE AND THEIR EQUIVALENTS UNDER THE LAWS OF ANY JURISDICTION OR INFRINGEMENT OF ANY PATENT COPYRIGHT OR OTHER INTELLECTUAL PROPERTY RIGHT UNLESS EXPRESSLY APPROVED IN WRITING BY TWO AUTHORIZED ST REPRESENTATIVES ST PRODUCTS ARE NOT RECOMMENDED AUTHORIZED OR WARRANTED FOR USE IN MILITARY AIR CRAFT SPACE LIFE SAVING OR LIFE SUSTAINING APPLICATIONS NOR IN PRODUCTS OR SYSTEMS WHERE FAILURE OR MALFUNCTION MAY RESULT IN PERSONAL INJURY DEATH OR SEVERE PROPERTY OR ENVIRONMENTAL DAMAGE ST PRODUCTS WHICH ARE NOT SPECIFIED AS AUTOMOTIVE GRADE MAY ONLY BE USED IN AUTOMOTIV
10. od is the possibility to supply the VIPer16 from 12 V secondary winding 7 V to 5 V This configuration results in a significant reduction in component count and thanks to the internal error amplifier permits reaching a low tolerance of 5 V The special feature of this configuration is the fact that the current flowing from the input bulk capacitor through the primary side of the transformer and power MOSFET is closed back to the input capacitor via secondary side capacitor C7 and this capacitor is partly discharged during the ON time Due to this effect the use of a low ESR capacitor for C7 is highly recommended Doc ID 17220 Rev 2 7 14 www BDTIC com ST Board details UM0920 3 3 Transformer The transformer was developed in cooperation with EPCOS and is available through order number T5684 51 01 The transformer specification is as follows E16 8 5 60 kHz voltage range 85 VAC 264 VAC Core shape E16 8 5 Core material N87 Core Al 100 nH 0 29 mm gap Bobbin 8 pin B66308 B663080A1108T001 Table 1 Transformer windings Number Wire Wire Wire of turns number diameter material Layer Start pin Stop pin Inductance Position 1 1 2 157 1 0 2 Cu2l 2450 H Primary 2 8 4 16 1 0 3 Cu2 26 UH Out 7 V 3 4 7 13 1 0 3 Cu2 17 uH Out 5 V 3 4 PCB details and layout The layout of PCB is based on a one sided FR4 with a 35 um thickness The total size of the P
Download Pdf Manuals
Related Search