for further information contact your local stmicroelectronics sales office. february 2013 doc id 024148 rev 1 1/4 4 STEVAL-ISA108V1 4 a, 850 khz fixed-frequen cy pwm synchronous step-down demostration board based on th e st1s41 in a vfqfpn package data brief features 4 to 18 v input voltage output voltage adjustable from 0.8 v 850 khz switching frequency internal soft-start integrated 95 m and 69 m power mosfets all ceramic capacitor enable function cycle-by-cycle current limiting current fold-back short-circuit protection rohs compliant description based on the st1s41 step-down switching regulator, the STEVAL-ISA108V1 demonstration board is an internally-compensated 850 khz fixed-frequency pwm synchronous step-down converter. the st1s41 operates from 4.0 v to 18 v input, while it regulates an output voltage as low as 0.8 v and up to v in (100% duty cycle). the st1s41 integrates a 95 m high side switch and 69 m low side synchronous rectifier, resulting in very high efficiency with very low output voltages. the peak current mode control with internal compensation offers a compact solution with a minimum component count. www.st.com
schematic diagram STEVAL-ISA108V1 2/4 doc id 024148 rev 1 1 schematic diagram figure 1. STEVAL-ISA108V1 circuit schematic
STEVAL-ISA108V1 revision history doc id 024148 rev 1 3/4 2 revision history table 1. document revision history date revision changes 12-feb-2013 1 initial release.
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