STEVAL-ISA094V1 STMicroelectronics

STEVAL-ISA094V1 3 A step-down switching power supply demonstration board based on the L7981 (HSOP8) Data brief Features 3 A DC output current 4.5 V to 28 V 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 STEVAL-ISA094V1 Description The STEVAL-ISA094V1 is a step-down switching power supply based on STMicroelectronics L7981 switching regulator in an HSOP8 package. The L7981 features an embedded power MOSFET and is capable of delivering up to 3 A of current to the load, depending on the application conditions. The input voltage can range from 4.5 V to 28 V, while the output voltage can be set from 0.6 V to V . IN Requiring a minimum number of external components, the device includes an internal 250 kHz switching frequency oscillator that can be externally adjusted up to 1 MHz. December 2011 Doc ID 022621 Rev 1 1/4 For further information contact your local STMicroelectronics sales office. www.st.com 4Schematic diagram STEVAL-ISA094V1 1 Schematic diagram Figure 1. STEVAL-ISA094V1 circuit schematic 5 , , 39. 6 6 6 6 6 ). /54 6 6 /54 & N& %. 6 6 N& &37 /-0 3403 , 2 P& - 6 2/4 Doc ID 022621 Rev 1