charging module for lead-acid batteries Product name: DD30CRTA is a PWM switching battery charger controller for 12V lead-acid batteries. The battery charger module uses few external components and is designed to charge 12V lead-acid batteries. It has trickle charge, constant current charge, overload mode and maintenance charge. In overload and float modes, the regulation voltage is set internally. The constant charge current can be programmed by a single sense resistor. 1. The fully discharged battery will automatically recharge with a programmed constant charge current of 17.5% until the battery voltage exceeds 75% of the regulated voltage in overload mode. When the charge current drops to 38% of the charge current, the overload is terminated.2. When charging with constant current, DD30CRTA will enter floating charge mode. If the battery voltage is less than 83.95% of the overload voltage in floating charge mode, the new charge cycle restarts automatically. When the input voltage is lower than the battery voltage, DD30CRTA will automatically enter sleep mode. Other functions include undervoltage lockout and status indication. Suitable for 1-1000AH 12V lead-acid battery charger. Voltage regulated in overvoltage mode and floating charge mode: In the overload mode, the VOC regulated voltage of the BAT pin is set to 14.8V (typical) and the accuracy is ± 1.5%.In floating charge mode, the regulated voltage VFLOAT of pin BAT is 91.57% of the overload mode, which is 13.55V (typical). Float charge mode At the beginning of the charge cycle, if the battery voltage is below 75% xVOC, the charger enters trickle charge mode and the charge current is set to 17.5% constant current. Final current overload: When the battery voltage is close to the overload voltage, the charger enters the overload mode. In the overcharge mode, the charge current starts to decrease.When the charge current drops to 38% of the constant charge current, the charger enters floating charge mode. Variable charge mode: After the overvoltage charge is finished, the charger enters floating charge mode. In floating charge mode, the battery voltage is regulated at 91.57% xVOC, which is 13.55V (typical). Floating charge mode can compensate for the loss of battery power due to self-discharge or external load. Ricarica automatica della batteria: In floating charge mode, if both battery and input power supply (wall adapter) are present, if the battery voltage drops below 83.95% xVOC due to self-discharge or external load, a new charge cycle will begin. It is also possible to manually initiate a new charge cycle by turning off the incoming power and reapplying it. Specification: Material: Plastic Weight: Approx. 8g/0.3oz Model: #01 Terminal Included, #02 No Terminal (Optional) Size: 4.6*2*1.2cm/1.8*0.8*0.5inch Power supply voltage: 15-28VDC(Recommended 16-25VDC) Over Charge Voltage: 14.8V Float Charge Voltage: 13.55V Maximum charge current: 3A Quiescent current: Approx. 1.8mA High PWM Switching Frequency: 300KHz Operating Ambient Temperature: -40 to +85 Functions: Fixed Over-Charge Voltage, Overcurrent protection, Automatic Conditioning of Deeply Discharged Batteries, Automatic Recharge, Charger Status Indication, Battery Overvoltage Protection Application: Car battery charging, Solar battery charging, Mobile Loadspeaker, Lead-Acid Battery Charger, Electric Bicycle Charger, UPS, Portable Industrial, Standalone Battery Chargers Package List: 1 x 3A 12V 1-1000AH Lead-Acid Battery Charger