for further information contact your local stmicroelectronics sales office. april 2012 doc id 023076 rev 1 1/4 4 STEVAL-ISA097V1 2 a step-down switching demonstration board based on the l7985 in dfn10 package data brief features 2 a dc output current from 4.5 v to 38 v range input voltage output voltage adjustable from 0.6 v 250 khz switching frequency programmable up to 1 mhz internal soft-start and enable low dropout operation: 100% duty cycle voltage feed-forward zero load current operation overcurrent and thermal protection rohs compliant description the STEVAL-ISA097V1 demonstration board is a step-down switching power supply based on the l7985 in dfn10 package. the l7985 is a step-down regulator with a 2.5 a (minimum) current limited embedded power mosfet, so it is able to deliver up to 2 a current to the load depending on the application conditions. the input voltage can range from 4.5 v to 38 v, while the output voltage can be set starting from 0.6 v to v in . requiring a minimum set of external components, the device includes an internal 250 khz switching frequency oscillator that can be externally adjusted up to 1 mhz. www.st.com
schematic diagram STEVAL-ISA097V1 2/4 doc id 023076 rev 1 1 schematic diagram figure 1. schematic diagram ! - v 4 0 6 / 5 4 4 0 6 / 5 4 2 . - 2 . - 2 2 2 2 4 0 ' . $ 4 0 ' . $ 4 0 6 ) . 4 0 6 ) . $ 3 4 0 3 , $ 3 4 0 3 , 2 k 2 k , u ( , u ( 2 k 2 k # n # n # p # p # n # n # n # n 2 k 2 k # u # u 2 2 # u # u 2 k 2 k / 5 4 6 # # & |