It's LM2596HVS Not LM2596S Chip,please know it
Type /name:LM2596HVS DC-DC step-down module
Input Voltage:4.5V ~ 53V
Output Voltage:3V ~ 40V
Output Current:3A (max)
Conversion efficiency:92%(the highest)
Output Ripple:
Switching frequency:150KHz
Operating Temperature:-45 ° ~ +85 °
Size:43mm * 21mm * 14mm (L * W* H)IN-IN + inputPositiveInput Negative!

Positive outputOUT +OUT-output negative

Input voltage range: DC4.5V to53V (inputvoltagemust be greater thanthe outputvoltageto1.5Vor morehigh.Could notboost)
Output voltage range: DC3Vto 40Vvoltage is continuously adjustable, high efficiency(up to 92%)the maximum outputcurrent of3A.

Measured12V input, 5Voutputcurrent is 1Aload regulationrate of less than1%

Note: This is thestep-down module, the input voltagemust behigher than the outputvoltage.

Outputcurrent is greater than2.5A (or outputpower greater than10W)to work long hours, please addheat sink.