may 2016 docid029293 rev 1 1 / 5 f or further information contact your local stmicroelectronics sales office www.st.com steval - isa190v1 38 v, 1.5 a synchronous step - down switching regulator evaluation board based on a6986f data brief features ? aecq100 qualification ? 1.5 a dc output current ? 4 v to 38 v operating input voltage ? low consumption mode or low noise mode ? programmable i skip current ? 30 a i q at light load (lcm v in = 12 v and v out = 3.3 v) ? 8 a i q - shtdwn ? adjustable f sw (250 khz - 2 mhz) ? output voltage adjustable from 0.85 v to v in ? embedded output voltage supervisor ? synchroni zation ? adjustable soft - start time ? internal current limiting ? overvoltage protection ? output voltage sequencing ? peak current mode architecture ? r ds(on)hs = 180 m; r ds(on)ls = 150 m ? thermal shutdown ? rohs compliant description the steval - isa190v1 is a product evaluation board based on st's synchronous step - down switching regulator a6986f. the device is capable of delivering up to 1.5 a and its 100% dut y cycle capability to withstand the cold crank event along with its wide input operating voltage range make a6986f the ideal choice for battery powered automotive systems. synchronous rectification improves efficiency at full load as well as application co mpactness, while high - frequency switching (programmable up to 2 mhz) lowers power passive costs and size while remaining outside of the am band. the device can operate in low consumption mode (lcm) with quiescent current as low as 30 a at v in = 12 v and v out = 3.3 v, hence assuring high efficiency at light loads, as required in typical car body applications that remain active while the car is parked. a low noise mode (lnm) can alternatively be selected to meet the forced pwm mode requirement under all load ing conditions for infotainment applications. the default evaluation board settings are 6 v output voltage configured in lcm, 500 khz switching frequency, high level i skip current and the switchover feature disabled. these configurations can easily be chan ged by the user to evaluate different application scenarios.
schematic diagram steval - isa190v1 2 / 5 docid029293 rev 1 1 schematic diagram figure 1 : steval - isa190v1 circuit schematic signal gnd power gnd 10v vin_flt pgnd vin_flt pgnd c1 4 4 . 7u f 50v l1 a nm + c13 a n m j5 r4 0 r1 1 10 tp3 synch c 8 120pf j3 l 1 10uh tp8 vin_emi c 9 10u f 50 v r1 0 nm c 2 1u f 100 v + c1 3 n m c6 10nf r2 nm c1 6 4 . 7u f 50v c 4 2.2p r 6 1m c1 0 10u f 50 v tp7 gnd j2 tp2 rst r 3 nm r 9 33k tp1 ss/inh c11 nm c 1 10u f 50 v r 5 nm r 7 200k r 1 0 c1 5 4 . 7u f 50v c 7 nm j1 tp6 gnd j4 tp4 vout u 1 a6986f rst 1 vcc 2 ss/inh 3 synch 4 fsw 5 mlf 6 comp 7 delay 8 vout 9 sgnd 10 pgnd 11 pgnd 12 lx 13 lx 14 vin 15 vbias 16 ep 17 l3 mpz2012s221a c5 68nf l 2 4.7uh c3 470nf r 8 100k tp5 vin gspg0205161515sg
steval - isa190v1 schematic diagram docid029293 rev 1 3 / 5 table 1: bom details reference description part number manufacturer c1, c9, c10 10 f 50 v x5r 10% cga5l3x5r1h106k tdk c2 1 f 100 v x7s 10% c2012x7s2a105k tdk c3 470 nf 10 v x7r 10% c4 2.2 pf 10 v x7r 10% c5 68 nf 10 v x7r 10% c6 10 nf 10 v x7r 10% c7, c11, c13, c13a not mounted c8 120 pf 10 v x7r 10% c14, c15, c16 4.7 f 50 v x5r 10% cga5l3x5r1h475k tdk l1 10 h xal5050 - 103mec coilcraft l2 4.7 h xal4030 - 472mec coilcraft l3 emc bead mpz2012s221a tdk r2, r3, r5, r9, r10 not mounted r1, r4, r7 0r r6 1 meg 1% r8 100k 1% r11 10r 1% j1 ss/inh control open j5 i skip set to high level open j2 switchover disabled closed j3 open j4 open u1 a6986f stmicroelectronics
revision history steval - isa190v1 4 / 5 docid029293 rev 1 2 revision history table 2: document revision history date version changes 04 - may - 2016 1 initial release.
steval - isa190v1 docid02929 3 rev 1 5 / 5 important notice C please read carefully stmicroelectronics nv and its subsidiaries (st) reserve the right to make changes, corrections, enhancements, modifications , and improvements to st products and/or to this document at any time without notice. pu rchasers should obtain the latest relevant information on st products before placing orders. st products are sold pursuant to sts terms and conditions of sale in place at the time of or der acknowledgement. purchasers are solely responsible for the choi ce, selection, and use of st products and st assumes no liability for application assistance or the design of purchasers products. no license, express or implied, to any intellectual property right is granted by st herein. resale of st products with p rovisions different from the information set forth herein shall void any warranty granted by st for such product. st and the st logo are trademarks of st. all other product or service names are the property of their respective owners. information in this document supersedes and replaces information previously supplied in any prior versions of this document. ? 2016 stmicroelectronics C all rights reserved
|
