STEVAL-ISA202V1 STMicroelectronics

STEVAL-ISA202V1 1.5 A step down switching regulator (V = 8 to 55 V) based on IN L4971 Data brief Description The STEVAL-ISA202V1 product evaluation board provides a platform for evaluation of the L4971, a 1.5 A asynchronous step-down power switching regulator with zero load current operation capability. Based on the selection of the external components, the device can operate in the entire input voltage range of 8 V < V < 55 V. The IN output voltage is limited by the voltage rating of the output capacitor, so it can be adjusted within the 3.3 V < VOUT < 30 V range through voltage divider R2, R3. The input and output capacitors are capable of sustaining the RMS current within the operating range. Features Input voltage range: 8 V to 55 V Output voltage: 5.1 V 3% (line, load and thermal) Output ripple: less than 51 mV Output current range: up to 1.5 A Max output ripple current: 30% Current limit: 2.5 A typ. Switching frequency: 200 kHz RoHS compliant August 2017 DocID030876 Rev 1 1/4 www.st.com For further information contact your local STMicroelectronics sales office Schematic diagram STEVAL-ISA202V1 1 Schematic diagram Figure 1: STEVAL-ISA202V1 circuit schematic VIN C7 100n 100V L1A U1 TOROIDE VOUT R1 L1 12k 4 OUT 120H (CC MSS1260-124KLD) C1 3 C2 OSC 180 63V 220n C9 R2 63V 2.7k 4.7n L4971 DIP 8 INH 2 8 SS/INH VFB C11 C10 100n R5 150F R3 4.99k C3 C6 R4 2.2n 220n C8 15k C5 82p GND C4 22n GND 2/4 DocID030876 Rev 1 EKY-630ELL181MJ20S 1 2 JP1 JUMPER 7 5 COMP VCC 1 6 GND BOOT STPS3L60 D1 2 1 DO-201AD EKY-350ELL151MHB51