The DD30CRTA is a PWM switch-mode battery charger controller for a 12V lead-acid battery in a small package using a few external components. The DD30CRTA is specially designed for charging 12V lead-acid battery with trickle charge, constant current charge, over-charge and float charge mode. In over-charge and float charge mode, the regulation voltage is internally set.
  
 
 
  
   The constant charge current is programmable with a single sense resistor.
  
 
 
  
   
  
 
 
  
   Deeply discharged batteries are automatically trickle charged at 17.5% of the programmed constant charge current until the cell voltage exceeds 75% of the regulation voltage in over-charge mode. The over-charge is terminated once the charging current drops to 38% of the constant charge current, then DD30CRTA will enter float charge mode. A new charge cycle automatically restarts if the battery voltage falls below 83.95% of the over-charge voltage in float-charge mode. DD30CRTA will automatically enter sleep mode when the input voltage is lower than the battery voltage.
  
 
 
  
   Other features include under-voltage lockout and indication, etc.
  
 
 
  
   
  
  
   Modes:-
  
 
 
 
 
  
   1: The Regulation Voltage in Over Voltage Mode and Float Charge Mode
  
 
 
  
   The regulation voltage VOC at BAT pin in overcharge mode is set at 14.8V(Typical) with 1.5% accuracy.
  
 
 
  
   In float charge mode, the regulation voltage VFLOAT at BAT pin is 91.57% of that in overcharge mode, which is 13.55V(Typical).
  
 
 
  
   Trickle Charge Mode At the beginning of a charge cycle, if the battery voltage is below 75%VOC, the charger goes into trickle
  
 
 
  
   charge mode with the charge current set at about 17.5% of the constant current.
  
 
 
 
 
  
   2: End-of-Over Charge Current
  
 
 
  
   When the battery voltage approaches the over-charge voltage, the charger goes into the overcharge mode. In
  
 
 
  
   overcharge mode, the charge current start to decrease and when the charge current drops to 38% of constant
  
 
 
  
   charge current, the charger goes into float-charge mode.
  
 
 
 
 
  
   3: Float Charge Mode
  
 
 
  
   After the overvoltage charge is terminated, the charger goes into float charge mode. In float charge mode, the
  
 
 
  
   battery voltage is regulated to 91.57%VOC, namely 13.55V(Typical). Float charge mode can compensate for
  
 
 
  
   the loss of battery power due to self-discharge or external loading.
  
 
 
 
 
  
   4: Automatic Battery Recharge
  
 
 
  
   In float mode, if both the battery and the input power supply (wall adapter) are present, a new charge cycle will
  
 
 
  
   begin if the battery voltage drops below 83.95%VOC due to self-discharge or external loading.
  
 
 
  
   A new charge cycle can also be started manually by plugging off the input supply and reapplying it.
  
 
 
  
  
  
   
    
   
  
  
   
    Application:
   
  
  
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     Car battery charging
    
   
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     Solar battery charging
    
   
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     Loudspeaker
    
   
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     Lead-Acid Battery Charger
    
   
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     Electric Bicycle Charger
    
   
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     UPS
    
   
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     Portable Industrial and Medical Equipment
    
   
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     Standalone Battery Chargers
    
   
 
 
  
   
  
 
 
  
   Features:
  
 
 
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    Fixed Over-Charge Voltage
   
  
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    Overcurrent protection
   
  
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    Automatic Conditioning of Deeply Discharged Batteries
   
  
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    Automatic Recharge
   
  
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    ChargerIndication
   
  
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    Battery Over voltage Protection
   
  
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    Suitable for 1-10000AH 12V Lead-Acid Battery charger
   
  
  
   
  
 
 
  
   Package Includes:
  
 
 
  
   1 x HOT DD30CRTA Lead Acid Battery Charger 12V Charging Device