张三叔

CN3722 Solar MPPT Charging Board

Overview

Upgraded version: https://oshwhub.com/xxdz12345/ltc8705

Overview :

CN3722 (Note 1) is a solar cell powered

PWM buck mode charge management integrated circuit with too

Solar battery maximum power point tracking function. CN3722 non

Often suitable for single or multi-cell lithium batteries or lithium iron phosphate batteries

Battery charging management, small package size, peripheral components

It has the advantages of less parts and simple use.

CN3722 has constant current and constant voltage charging modes, which is very suitable for

Charging of lithium ion batteries or lithium iron phosphate batteries. Charging at constant voltage

power mode, the constant charging voltage is divided by an external resistor divider network

setting; in constant current charging mode, the charging current passes through a

External resistor setting.

For deeply discharged batteries, when the battery voltage is lower than the set

When 66.7% of the set constant voltage charging voltage, CN3722 uses

15% of the set constant current charging current is used to trickle the battery.

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

small, when the charging current reduces to the set constant current charging current

When the battery reaches 9.5%, it enters the charging end state. When input power

When there is a power outage or the input voltage is lower than the battery voltage,

CN3722 automatically enters low-power sleep mode.

Other features include input low voltage latch, battery temperature monitoring

Test, battery terminal overvoltage protection and charging status indication, etc.

CN3722 is available in 16-pin TSSOP package.

application :

 Charging using solar cells

 Laptop

 Backup battery application

 Portable industrial and medical instruments

 Power tools

 Independent battery charger

After half a month of use, the maximum charging current can reach the expected 6.58A. The MOS tube heats up so much that a heat sink and fan are needed.

Design Files

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Update:2024-11-14 23:23:36

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