I’ve just purchased this buck converter, <span style=”display: inline !important; float: none; background-color: transparent; color: #111111; font-family: ‘Amazon Ember’,Arial,sans-serif; font-size: 21px; font-style: normal; font-variant: normal; font-weight: 400; letter-spacing: normal; line-height: 27.3px; orphans: 2; text-align: left; text-decoration: none; text-indent: 0px; text-transform: none; -webkit-text-stroke-width: 0px; white-space: normal; word-spacing: 0px;”>DROK DC-DC Buck Converter Constant Current&Volt Regulator 5-36V to 1.25-32V Step Down Regulator 5A 75W High Power LED CC Driver Board, Battery Charger for Solar Panels/Wind Driven Generator, </span>part number <span style=”display: inline !important; float: none; background-color: transparent; color: #111111; font-family: ‘Amazon Ember’,Arial,sans-serif; font-size: 13px; font-style: normal; font-variant: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: left; text-decoration: none; text-indent: 0px; text-transform: none; -webkit-text-stroke-width: 0px; white-space: normal; word-spacing: 0px; word-wrap: break-word;”>091029US</span>, from Amazon. The unit works well in constant voltage mode but I can’t determine how to get it into constant current mode. Is there a manual or set of instructions?