data brief for further information contact your local stmicroelectronics sales office. september 2011 doc id 022276 rev 1 1/4 4 STEVAL-ISA082V1 4 a peak 800 khz fixed-freque ncy pwm synchronous step-down demonstration board with enable on/off based on the st1s40iphr features input voltage v in : 4 v to 18 v output voltage v out : 3.3 v maximum output current : 4 a switching frequency: 800 khz short-circuit protected rohs compliant description the STEVAL-ISA082V1, based on the st1s40iphr, is an internally compensated 800 khz fixed-frequency pwm synchronous step- down converter demonstration board. the st1s40 operates from 4.0 v to 18.0 v input, while it regulates an ou tput voltage as low as 0.8 v and up to v in (100% duty cycle). the st1s40 integrates a 95 m ? high-side switch and a 69 m ? synchronous rectif ier allowing very high efficiency with very low output voltage. the peak current mode control with internal compensation delivers a very compact solution with a minimum component count. the st1s40 is protected through cycle-by-cycle current limiting in case of overload and is also protected by a current foldback function with frequency reduction in case of short-circuit. the device is available with an enable on/off function. STEVAL-ISA082V1 www.st.com
circuit schematic STEVAL-ISA082V1 2/4 doc id 022276 rev 1 1 circuit schematic figure 1. circuit schematic 6 ) . 3 7 3 7 & " 0 ' . $ ! ' . $ % . 0 ' 3 4 3 # i n ? s w ? & # o u t ? & , ? ( 2 2 6 ) . ! # i n ? a n ? & 6 / 5 4 6 6 ) . 6
STEVAL-ISA082V1 revision history doc id 022276 rev 1 3/4 2 revision history table 1. document revision history date revision changes 27-sep-2011 1 initial release.
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