LM2596S LED Constant Current & Constant Voltage Driver Power Supply Module Input voltage: 7 V – 35 V; Output Voltage: 1.25 V – 30 V ; Output Current: adjustable maximum 3 A Conversion efficiency: 92% (the highest) ; Switching frequency, 150 KHZ; The Output ripple: 50 mv (Max) 20 m bandwidth The Load Regulation: plus or minus 0.5%; Voltage Regulation: plus or minus 2.5% ; Operating Temperature: – 40 ° to + 85 ° Size: 46 mmx23mmx10mm / 1.81 x0.91 x0.39 (inch) (approx)