STEVAL-L7983V50 STMicroelectronics

STEVAL-L7983V50 Data brief 5.0 V / 0.3 A step down DC/DC converter (V = 5 to 60 V) based on the IN L7983PU50R regulator Features 5 V to 60 V operating input voltage Step-down (buck) conversion 5 V output voltage 300 mA DC max. output current 1 MHz selected switching frequency Dynamic Low Consumption Mode to Low Noise Mode selection Internal soft-start Synchronization to external clock Internal compensation network Auto recovery overcurrent, overvoltage and thermal protection RoHS and China RoHS compliant WEEE compliant (2012/19/UE RAEE II) Description The STEVAL-L7983V50 step-down switching power supply evaluation board is based on the L7983PU50R regulator in an DFN10 3x3 mm package with 5 V set output voltage. The selected switching frequency is 1 MHz and it can be adjusted by applying an external clock on the LNM/LCM pin or by changing the frequency programming resistor. The step-down monolithic switching regulator can deliver up to 300 mA DC based on peak current mode architecture. The wide input voltage range and adjustable UVLO Product summary threshold meet the specification for 12 V, 24 V and 48 V industrial bus standards. 5 V/0.3 A step down L7983 supports dynamic Low Consumption Mode (LCM) to Low Noise Mode (LNM) DC/DC converter (VIN = STEVAL- 5 to 60 V) based on the L7983V50 transition. LCM is designed for applications with active idle mode to maximize the L7983PU50R efficiency at light load with controlled output voltage ripple, while LNM keeps the switching frequency constant over the load current range for low noise applications. 60 V, 300 mA synchronous step-down The soft start time is internally fixed and the output voltage supervisor manages the L7983PU50R switching regulator with reset phase for any digital load (MCU, FPGA, etc.). 10 A quiescent current The internal compensation network features high noise immunity, simple design and Applications Buck Converter component cost savings. The RST open collector output can also implement output voltage sequencing during the power-up phase. The synchronous rectification, designed for high efficiency at medium to heavy loads, and the high switching frequency capability contribute to size reduction in final application designs. Pulse-by-pulse current sensing on both power elements implements effective constant current protection. DB4314 - Rev 1 - October 2020 www.st.com For further information contact your local STMicroelectronics sales office.STEVAL-L7983V50 Schematic diagrams 1 Schematic diagrams Figure 1. STEVAL-L7983V50 board schematic TP5 TP4 LX GND R9 0 VOUT R10 N.M. R2 TP3 N.M. R1 U1 L7983PU50R C6 VOUT C4 0 1 10 N.M. VOUT/FB GND L1 47uH 100nF VBIAS 2 9 VOUT VBIAS LX TP2 VCC 3 8 VIN VCC VIN VIN C2 FSW 4 7 C1 2.2uF FSW EN/UVLO R3 C3 1uF LNM-LCM 5 6 N.M. VIN LNM/LCM RESET 470nF EP VIN R8 11 R4 100k R5 + C10 ENABLE 0R 100k N.M. TP1 GND VIN TP6 ENABLE TP8 TP7 R6 TP9 TP11 TP12 GND LNM-LCM RESET VCC VBIAS 100k ENABLE LNM-LCM VBIAS VCC RESET R7 C5 N.M. NM DB4314 - Rev 1 page 2/4 1 1 1 1 1 1 1 1 1 1 1