DC 300W 20A CC CV Constant Current Adjustable Step Down Converter Voltage Buck Current Source Module Introduction to Synchronous Rectification Technology: Synchronous rectification is a new technology that uses special power MOSFETs with extremely low on-state resistance to replace rectifier diodes to reduce rectification losses. It can greatly improve the efficiency of the DC/DC converter and there is no dead zone voltage caused by the Schottky barrier voltage. Power MOSFET is a voltage-controlled device, and its volt-ampere characteristic is linear when it is turned on. When using a power MOSFET as a rectifier, the gate voltage must be synchronized with the phase of the rectified voltage to complete the rectification function, so it is called synchronous rectification. Synchronous rectification technology is to greatly reduce the rectification loss at the output end of the switching power supply, thereby improving the conversion efficiency and reducing the heating of the power supply itself. Parameter Description: Module nature: synchronous rectification, non-isolated step-down constant current constant voltage module, CC CV charging module Scope of application: high-power LED constant current drive, lithium battery charging (including ferroelectric), 4V, 6V, 12V, 14V, 24V battery charging, nickel-cadmium nickel-metal hydride battery (battery pack) charging, solar panels, wind generators Input voltage: DC6-40V Output voltage: continuously adjustable (1.2-35VDC) for a long time below 32V (applicable to applications where the input voltage is higher than the output voltage can not be boosted) Output current: Maximum 20A, within 15A for a long time (the power tube temperature exceeds 65 degrees, please add a fan to dissipate heat, high voltage output, please use derating) Current limit range: 0.2-20A (adjustment) module exceeds 65 degrees, please add a fan. Minimum pressure difference: 3V Working frequency: 150KHZ Conversion efficiency: up to about 96%, the efficiency is related to the pressure difference and the use environment Output ripple: Ripple around 50mV (no noise) 20M bandwidth (for reference only) 24V input measured Working temperature: -10C to +75C) (Please pay attention to the temperature of the power tube in actual use, and if the temperature is too high, please strengthen the heat dissipation or derate the use) Potentiometer adjustment direction: clockwise (increase), counterclockwise (decrease) Output short circuit protection: Yes (instantaneous protection) constant current (currently set constant current value can not be short-circuited for a long time) Input reverse connection protection: None, Output anti-backflow: None, for the load self-charged or inductive load requires an additional 2-pole tube! Wiring mode: terminal block Module size: 60*53*30MM Net weight: about 85 grams Output current adjustment method: 1. Adjust the CV potentiometer and set the output voltage to the voltage value you need according to your load requirements. 2. Set the CC potentiometer counterclockwise for about 30 turns (that is, set the output current to the minimum), connect the LED, and adjust the CC potentiometer to the current you need. For battery charging, after the battery is discharged, connect to the output and adjust CC to the current you need. (When charging, you must use the discharged battery to adjust it, because the battery has more power. More, the smaller the charging current.) Wiring instructions: OUT+: output positive OUT-: output negative +IN: input positive -IN: Enter a negative number CV: output voltage regulation CC: Output current adjustment EN: enable, turn off the output at low level; pause, valid at high voltage level When the input and output are grounded, the no-load CV outputs constant voltage, and CC outputs constant current Shipment 1. WORLDWIDE SHIPPING. (Except some countries and APO/FPO) 2. Orders processed timely after the payment verification. 3. We only ship to confirmed order addresses. Your order address MUST MATCH your Shipping address. 4. The images shown are not the actual item and are for your reference only. 5. SERVICE TRANSIT TIME is provided by the carrier and excludes weekends and holidays. Transit time may vary, particularly during the holiday season. 6. If you have not received your orderafter 30 days from payment, please contact us. We will trace your order and get back to you asap. Our goal is customer satisfaction! 7. Delivery Time: Return & Refund 1. You have 7 days to contact us and 30 days to return it from the date received. If the item is in your possession more than 7 days, it will be considered used and WE WILL NOT ISSUEA REFUND OR REPLACEMENT to you. There are NO EXCEPTIONS! Shipping cost is bear by both seller and buyer in half. 2. All returned items MUST BE in