• CN3767 circuit lead-acid battery charger, CN3767 is an integrated circuit for managing the charging of a 4A, 12V lead-acid battery with maximum power point tracking function for solar panels, Lead-acid battery charging, Uninterruptible power supply, Backup battery application, Portable industrial and medical instruments, Standalone battery charger.
  
  
  It is recommended to waterproof the circuit board in a damp and rainy environment by coating both sides of the circuit board with 704 silicone rubber or placing it in a waterproof box.
  Do not reverse the positive and negative terminals, as it may cause permanent damage to the product.
  As shown in the diagram, L1 is a 47uh toroidal inductor and R2 is a 30 milliohm copper wire resistor.
  
  CN3767 is an integrated circuit for managing the charging of a 4A, 12V lead-acid battery with maximum power point tracking function for solar panels.
  Parameters:
  
  CN3767 is a PWM buck mode 12V lead-acid battery charging IC, which independently manages the automatic charging of lead-acid batteries. It has the advantages of small package size, fewer peripheral components, and simple use.Electronic Components
  
  CN3767 has trickle charge, constant current, overcharge, and float charge modes, which are very suitable for charging 12V lead-acid batteries. In the overcharge and float charge modes, the typical charging voltages are 14.8V and 13.55V respectively; in the constant current charging mode, the charging current is set by an external resistor.
  
  When powered by a solar panel, the internal circuit can automatically track the maximum power point of the solar panel, allowing users to maximize the output power of the solar panel without having to consider the worst-case scenario, making it ideal for applications powered by solar panels.
  
  If the battery voltage drops below 75% of the set overcharge voltage, CN3767 will trickle charge the battery with 17.5% of the set constant current charging current. In the overcharge stage, the charging current gradually decreases, and when the charging current drops to 38% of the constant current charging current, CN3767 enters float charge mode. In float charge mode, if the battery voltage drops to 83.95% of the set overcharge voltage, a new charging cycle will automatically begin.
  
  When the input power is disconnected or the input voltage is lower than the battery voltage, CN3767 will automatically enter a low power consumption sleep mode. Other features include input low voltage lockout, battery terminal overvoltage protection, and charging status indication.Power Supplies
  
  CN3767 uses a 10-pin SSOP package.

   

  
  Application:
  Lead-acid battery charging
  Uninterruptible power supply
  Backup battery application
  Portable industrial and medical instruments
  Standalone battery charger / mainteiner
   

  
  Features

     Maximum charging current is 4A.
     Suitable for 12V lead-acid battery.
     Input voltage is 15.2V~28V
     Maximum power point tracking function for solar panels
     Wide input voltage range: 6.6V to 30V
     Complete charging management for 12V lead-acid batteries
     Overcharge and float charge voltages are 14.8V and 13.55V respectively
     PWM switch frequency: 300KHz
     Trickle charge for deeply discharged batteries
     Automatic recharging function
     Dual status indication
     Soft start function
     Battery terminal overvoltage protection
     Operating environment temperature: -40 °C to +85 °C
      
  
   

  Documents

     Schematics
     Gerber files
     BOM
     CN3767  photovoltic
     CN3765  non MPPT