STEVAL-ISA155V1: 3.3V @ 1A, 8 ~ 25Vin, CC

Summary

The STEVAL-ISA155V1 evaluation board integrates the stepdown switching regulator with adjustable current limit L6902D as well as the external components required for a typical application.

The input voltage of the application board can range from 8V up to 25V due to the rated voltage of the input capacitor and the schottky rectifier repetitive peak reverse voltage (both 25V). The external resistor divider (R1 and R2) sets the output voltage of the application board to 3.3V.

A different output voltage can be regulated from 1.235V up to 10V, which is the rated voltage of the output capacitor.

A current limit of 1A is programmed by the 100mΩ sense resistor; Rsense. The inductor saturation current and the forward current of the Schottky rectifier fit the current limit setting.

Specifications

Manufacturer	STMicroelectronics
Category	AC/DC and DC/DC Conversion
Sub-Category	DC/DC SMPS - Single Output
Eval Board Part Number	497-4746-ND
Eval Board Supplier	STMicroelectronics
Eval Board	Board not Stocked
Topology	Step Down
Outputs and Type	1 Non-Isolated
Voltage Out: Factory Set	3.3 V
Current Out	1 A
Voltage In	8 ~ 25 V
Efficiency @ Conditions	>92%, 3.6V in, 3.3V @ 2 ~ 600mA >90%, 4.2V in, 3.3V @ 2 ~ 600mA
Voltage Out Range	1.235 ~ 10 V
Features	Current Limit (Adj. or Fixed) Short Circuit Protection Thermal Protection Zero Load Regulation
Switching Frequency	250 kHz
Standby Current [Typical]	- Not Given
Quiescent Current [Typical]	3 mA
Component Count + Extras	11 + 5
Internal Switch	Yes
Design Author	STMicroelectronics
Application / Target Market	Battery Chargers
Standby Current [Maximum]
Quiescent Current [Maximum]	5 mA
Main I.C. Base Part	L6902D
Date Created By Author	2017-12
Date Added To Library	2011-03