This document describes a 55W flyback SMPS demonstration board for an alarm system, based on L5991 and STP12NK80Z. It features multiple output voltages and signals, as well as a battery charger circuit. The input voltage range is 88-300Vac, and the output voltages include 13.8V, 25V, and 3.8V.
The STEVAL-ISA033V1 is a demonstration board designed as a multi-output Switched Mode Power Supply (SMPS) for alarm systems. It utilizes an AC-DC single output converter with an approximate power capability of 60 W, while additional outputs are generated via DC-DC converters. The board also integrates a battery charger circuit capable of charging a standard SLA 12 V battery.
| Input voltage | 88 - 300 Vac (f: 50-60 Hz) |
|---|---|
| Output voltage 1 | 13.8 V |
| Output current 1 | 3A |
| Output voltage 2 | 25 V |
| Output current 2 | 200 mA |
| Output voltage 3 | 3.8 V |
| Output current 3 | 350 mA (1.9 A peak) |
| Battery type | SLA 12 V |
The board accepts an AC input voltage between 88 and 300 Vac at a frequency of 50-60 Hz.
The unit provides three outputs: 13.8 V at 3 A, 25 V at 200 mA, and 3.8 V at 350 mA.
The power supply includes a circuit to charge a standard SLA 12 V battery.