A buck converter is a DC-to-DC power converter that steps down the voltage from its input to its output. CA-1235 is an adjustable Power Supply Module that steps down the 15v input to 1.25V 1.5V 1.8V 2.5V 3.3V 5V Specification of Adjustable Buck Convertor Module CA-1235: Input voltage: 5V ~ 15V The output voltage: 1.25V 1.5V 1.8V 2.5V 3.3V 5V Output current: 3A (maximum), long working current of about 1.5A Conversion efficiency: 96% (highest) Output ripple: <30mV Switching frequency: 1.5MHz (highest), typical 1MHz Operating temperature: -45 °C to 85 °C Package Include: 1 x Adjustable Buck Convertor Module CA-1235 In Pakistan