Vermes
Advanced Member level 4
It is a STEP-DOWN converter operating as a voltage stabilizer to 1,8A on a chip L5973D. Input voltage is in the range of 4V – 35V, but when the temperature exceeds 85 degrees Celsius, the maximum voltage drops to 28V, because of the strength of tantalum capacitors. Output voltage can be adjusted using multiturn potentiometer. There is a filtering choke at the output, so that the voltage ripple at the output does not exceed 5mV to about 1,7A, then increase (for the input voltage below 30V, ripple does not grow up to 1,8A). Probably this is due to approaching the choke to saturation, the manufacturer gives max 1,8A. The stabilizer has a current (2,5A) and thermal protection (remember about tantalum capacitors). Minimum voltage between input and output at 1,4A-0,9V and 0,6A-0,3V, so it can be called LDO. Board dimensions: 36mm x 30mm height of 9mm.
Scheme can be found in the manufacturer's note L5973D.
The other side of the board:
Link to original thread (useful attachment) – Impulsowy stabilizator napięcia 1,25V do 32V 1,8A
