CN3791 Solar lithium battery charging verification board

Overview:

CN3791 is a PWM step-down converter that can be powered by solar panels.

Voltage mode single-cell lithium battery charge management integrated circuit, independent for single

Lithium-ion battery charging is managed, with a small package form factor and peripheral

It has the advantages of fewer components and simple use.

CN3791 has trickle current, constant current and constant voltage charging modes, very

Suitable for lithium battery charging management. In constant voltage charging mode, CN3791

Regulate the battery voltage at 4.2V; in constant current charging mode, charge

The current is set through an external resistor. When the input power current

When output capability is reduced, internal circuitry can automatically track solar energy

The maximum power point of the board, the user does not need to consider the worst case scenario, but

Maximizes the output power of solar panels, ideal for

Applications powered by solar panels.

For deeply discharged lithium batteries, when the battery voltage is lower than the constant voltage charge

When the voltage is 66.5% (typical value), CN3791 uses the set

Trickle charge the battery at 17.5% of the constant current charging current. exist

During the constant voltage charging stage, the charging current gradually decreases. When the charging current

Charging ends when it drops to 16% of the constant current charging current. Recharging

Charging end state, if the battery voltage drops to the constant voltage charging voltage

95.5%, automatically starts a new charging cycle. When input power

When power fails or the input voltage is lower than the battery voltage, CN3791 automatically

Enter sleep mode.

Other features include input low voltage latch, battery terminal overvoltage protection

and charging status indication, etc.

The CN3791 is available in a 10-pin SSOP package. Solar panel maximum power point tracking function

⚫ Wide input voltage range: 4.5V to 28V

⚫ Complete charging management of single-cell lithium battery

⚫ Charging current up to 4A

⚫ PWM switching frequency: 300KHz

⚫ Constant charging voltage: 4.2V±1%

⚫ Constant charging current is set by external resistor

⚫ Trickle charge a deeply discharged battery

⚫ Automatic recharging function

⚫ Charging status and charging end status indication

⚫ Soft start function

⚫ Battery terminal overvoltage protection

⚫ Working environment temperature: -40℃ to +85℃

⚫ Available in 10-pin SSOP package

⚫ The product is lead-free, meets Rohs and does not contain halogen