STEVAL-ISA209V1 STMicroelectronics

STEVAL-ISA209V1 Data brief 38 V, 3 A synchronous step-down switching regulator evaluation board based on the L6983NQTR Features 3.5 V to 38 V operating input voltage Output voltage from 0.85 V to VIN 3.3 V and 5 V fixed output voltage versions 3 A DC output current 17 A operating quiescent current Internal compensation network Two different versions: LCM for high efficiency at light loads LNM for noise sensitive applications 2 A shutdown current Internal soft-start Enable Overvoltage protection Output voltage sequencing Thermal protection QFN16 package 200 kHz to 2.2 MHz programmable switching frequency stable with low ESR capacitor. Optional spread spectrum for improved EMC Power Good Product summary Synchronization to external clock for LNM devices 38 V, 3 A synchronous step-down switching STEVAL- Description regulator evaluation board ISA209V1 based on the L6983NQTR The L6983 is an easy to use synchronous monolithic step-down regulator capable of delivering up to 3 A DC to the load, and the wide input voltage range makes the 38 V 3A synchronous step- device suitable for a broad range of applications. The L6983NQTR used in this down converter with 17 A L6983 evaluation board is based on peak current mode architecture and is packaged in a quiescent current QFN16 3x3 with internal compensation, thus minimizing design complexity and size. The L6983 is available in low consumption mode (LCM) and low noise mode (LNM) versions. LCM maximizes the efficiency at light-load with controlled output voltage ripple, which is ideal for battery-powered applications. LNM sets the switching frequency and minimizes the output voltage ripple overload current range, meeting the specification for low noise sensitive applications. The L6983 allows a 200 Hz - 2.2 MHz switching frequency range with optional spread spectrum for improved EMC. The EN pin provides an enable/disable function, and the typical shutdown current is 2 A when disabled. As soon as the EN pin is pulled up, the device is enabled and an internal 1.3 ms soft-start sequence is triggered. The device also features a Power Good open collector that monitors the FB voltage. Pulse-by-pulse current sensing on both power elements implements effective constant current protection and thermal shutdown prevents thermal run-away. DB4101 - Rev 1 - December 2019 www.st.com For further information contact your local STMicroelectronics sales office.STEVAL-ISA209V1 Schematic diagrams DB4101 - Rev 1 page 2/4 1 Schematic diagrams Figure 1. STEVAL-ISA209V1 schematic diagram Coilcraft: MSS1048 Coilcraft: XAL6060 4.7uH L1A TP3 VOUT VOUT NM L1B TP4 GND GND LX U1 C6 1uF L6983NQTR C2A 1uF 100nF C2B Type = 50V Type = 50V R5 GND GND TP8 0 1 12 VIN1 VIN2 2 11 VINLDO BOOT R13 0.1K 3 10 GND SGND1 SGND2 Type = 16V TP5 4 9 VCC C71uF EN EN/CLKIN VCC size 0603 NM GND 17 CLKIN TP6 C9 EP1-SGND NM R8 10k R9 FB TP7 PGOOD R4 82k size 0603 R7 R12 R3 400K R6 Type = 16V J2 0 C17 Coilcraft XAL4030 NM 1Meg n.m. TP1 L3 4.7uH L2 C8NM VIN VOUT VIN MPZ2012S221A size 0805 R1 10K + C11 R11 1uF n.m. Type = 16V R2 NM TP2 GND GND EMI filters, optional components size 1206 C14 Type = 50V 4.7uF size 1206 C13 Type = 50V 4.7uF size 1206 Type = 50V C12 4.7uF Panasonic size 1206 EEHZA1H101P 10x10 C1 Type = 50V 100uF 50V C15 10uF Type = 50V size 0805 C16 1uF size 0805 5 16 PGOOD PGND2 6 15 VBIAS SW2 7 14 FB SW1 8 13 FSW PGND1 size 0805 size 1206 10uF C3 Type = 16V 10uF size 1206 Type = 16V C4 size 1210 22uF Type = 16V C5