ST EVAL5986/EVAL5986A handbook
Contents
1. AYI EVAL5986 EVAL5986A 2 5 A step down switching regulator demonstration board Features 2 5 A DC output current 2 9 V to 18 V input voltage Output voltage adjustable from 0 6 V to 16 V 250 kHz switching frequency programmable up to 1 MHz Internal soft start and inhibit Low dropout operation 100 duty cycle Zero load current operation Overcurrent and thermal protection VFQFPN8 3 mm x 3 mm package or HSOP8 for the L5986A Description The EVAL5986 A demonstration board provides the design engineer with a fully functional step down switching regulator with an output current of up to 2 5 A The board integrates STMicroelectronics L5986 A step down switching regulator together with all the external components required for a typical application The rated voltage of the input capacitor and the Schottky diode rectifier repetitive peak reverse voltage are both 25 V making the board capable of covering the entire 2 9 V 18 V input voltage range of the L5986 A device The board features an external resistor divider R1 and R2 designed for an output voltage of 1 8 V The output voltage can be set to a level from 0 6 V up to the input voltage October 2009 based on the L5986 L5986A AM02109v1 The compensation network on the demonstration board allows the use of MLCC as output filter to keep the loop stable The inductor saturation current and forward current of the Schottky diode are within the curre2. com ECOPACK is an ST trademark Doc ID 16567 Rev 1 ky EVAL5986 EVAL5986A Revision history 4 Revision history Table 2 Document revision history ome Lou ass 29 Oct 2009 Initial release kI Doc ID 16567 Rev 1 5 6 EVAL5986 EVAL5986A 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 and 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 CON
3. DITIONS 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 AN AUTHORIZED ST REPRESENTATIVE 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 AUTOMOTIVE 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 2009 STMicroelectronics All rights reserved ST
4. Microelectronics 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 6 6 Doc ID 16567 Rev 1 ky
5. nt limit values The switching frequency on the demonstration board is set to 500 kHz by means of the R5 resistor connected to pin Fsw Doc ID 16567 Rev 1 1 6 www st com EVAL5986 A application circuit and component list EVAL5986 EVAL5986A 1 2 6 EVAL5986 A application circuit and component list Figure 1 Application circuit aes i Li 5 2uH MSS1038 a A Vin 2 9V 18V OUT Ann Vout 1 8V C1 C2 99y a Do i D1 STPS2L25 25V 3 SYNCH 25V MA R1 4 99K AMO2110v1 Figure 2 Package VFQFPN8 3x3 mm HSOP8 exposed pad Table 1 Component list e rae oo a ov a a ofS Copo f e o Doc ID 16567 Rev 1 ky EVAL5986 EVAL5986A PCB layout 2 PCB layout Figure 3 PCB layout component side EVAL5986 7 www st com www st com m e AYI R ca DC w vi S T ved R5 LE IC3 R4 TA K3 SYNCH EVAL5986A 7A Rev2 AM02112v1 AM02113v1 Figure 4 PCB layout bottom side Figure 5 PCB layout front side AM02114v1 ky Doc ID 16567 Rev 1 3 6 Package mechanical data EVAL5986 EVAL5986A 3 4 6 Package mechanical data In order to meet environmental requirements ST offers these devices in different grades of ECOPACK packages depending on their level of environmental compliance ECOPACK specifications grade definitions and product status are available at www st
Download Pdf Manuals
Related Search
ST EVAL5986/EVAL5986A handbook