Solar panel powered lead-acid battery, lithium iron phosphate battery, lithium battery charging management IC-EEWORLD

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CS5350/CS5328 Solar panel powered lead-acid battery, lithium iron phosphate battery, lithium battery charging management IC series

In 2021, the time-sharing power restrictions across the country fully exposed the serious power gap in my country, and energy conservation and emission reduction are hot topics at the moment. Solar energy is a natural and environmentally friendly energy source from nature. With the technological development of solar photovoltaic conversion materials such as monocrystalline silicon and polycrystalline silicon, solar energy is widely used in various fields such as street light power supply, communication equipment power supply, broadcasting equipment power supply, and life scenarios. Based on the particularity of the existence time of solar energy, battery energy storage is generally required. Therefore, solar panels are indispensable for battery charging management circuits. The output power of solar panels varies with the amount of light. Traditional solar charging methods are inefficient and do not maximize the use of the converted energy.

Shenzhen Yongfukang Technology Co., Ltd. promotes the lead-acid battery, lithium iron phosphate, and lithium battery charging management IC series - CS5328E/CS5350E with the maximum power point tracking (MPPT) function of solar panels for the solar energy application market. It makes the most of the energy absorbed and converted by the solar panel to charge the battery, and the maximum charging current can be set to 5A.

The principle and process are as follows:

The output of the solar panel is a current-limited voltage source. Its volt-ampere characteristic is shown in the figure below:

The output current of the solar panel increases from a small value, and the output voltage Voc is basically kept unchanged. At a certain moment, as the output current continues to increase, the output voltage will drop rapidly, and the final output is zero. The above figure shows different output VI characteristic curves under different light. The output power is equal to the product of voltage and current. It can be seen from the above figure that at a certain moment, the maximum power point (MPP) of the solar panel output is as shown in the figure below, which appears at the turning point of the solar panel output characteristic curve. At this time, the product value of the output voltage and current is the largest.

It can be seen that the maximum power point (MPP) of the solar panel output is different under different sunlight. In order to improve efficiency and maximize the use of the energy converted by the solar panel, the charging circuit needs to have the maximum power point tracking (MPPT) function. CS5328E, CS5350E is a charging management IC dedicated to solar panel power supply. CS5328E is used for lead-acid battery charging management, and CS5350E is used for lithium battery or lithium iron phosphate battery charging management. For solar power supply, both have perfect maximum power point automatic tracking (MPPT) function. CS5328E, CS5350E monitor the voltage and current output of the solar panel in real time, and automatically adjust the output to the battery charging current to capture the real-time maximum power point (MPP) of the solar panel. Realize the maximum utilization of the output power of the solar panel. In addition to the maximum power point tracking (MPPT) of the solar panel, CS5328E, CS5350E also have many special functions and excellent performance.

1. CS5328E, CS5350E Overview

CS5328E is a 24V voltage-resistant, asynchronous step-down lead-acid battery charging management IC. It has a complete charging process including trickle charging, constant current charging, overcharging, and floating charging.

CS5350E is a 24V voltage-resistant, 1-5 lithium battery or 1-6 lithium iron phosphate battery asynchronous step-down charging management IC. It has a complete charging process of trickle charging, constant current charging, and constant voltage charging.

CS5328E, CS5350E have an internal integrated power MOS with a maximum charging current capability of 5A. The charging current can be flexibly adjusted through external resistors. CS5328E, CS5350E have a built-in input adaptive loop that can intelligently adjust the charging current to prevent the adapter output from being pulled down. They can match all adapters, and the input adaptive point can be flexibly adjusted through external voltage divider resistors.

When CS5328E and CS5350E are powered by solar panels, the internal circuit can automatically track the maximum power point of the solar panel. Users do not need to consider the worst case and can maximize the use of the output power of the solar panel. They are very suitable for applications powered by solar panels. CS5328E can independently adjust the overcharge end current and overcharge voltage through external resistors. CS5350E can independently adjust the constant voltage charge end current and constant voltage charge voltage through external resistors.

CS5328E and CS5350E have complete protection functions, including input undervoltage and overvoltage protection, battery charging overvoltage and short circuit protection, battery over-discharge voltage protection, battery temperature protection, chip overtemperature protection, and charging timeout protection. In addition, the chip can monitor the entire charging process through two external LED indicators.

2. CS5328E, CS5350E Description

Wide input voltage range: CS5328E, CS5350E: 3.6V~24V
Solar panel maximum power point tracking function
Maximum 5A charging current, charging current adjustable by external resistor
Overcharge end current is independently adjustable (CS5328E)
Overcharge voltage is independently adjustable (CS5328E)
Charge termination current is independently adjustable (CS5350E)
Constant voltage charging voltage is independently adjustable (CS5350E)
NTC function
Low power shipping mode
Zero battery drain (application without path)
±1% battery overcharge accuracy
Support dual LED charging status indication
400KHz switching frequency
Battery charging overvoltage, short circuit protection
Battery over discharge voltage protection
Input undervoltage and overvoltage protection
IC temperature adaptive adjustment, IC over-temperature protection
EQA-28 Package

3. Applications of CS5328E, CS5350E

CS5328E: Lead-acid battery charging, uninterruptible power supply, backup battery applications, solar street lights, portable industrial and medical instruments, etc.

CS5350E: LiFePO4 battery pack, lithium battery pack, notebook computer, solar panel charging, power tools, portable industrial and medical equipment, etc.

4. CS5328E Application Information

(1). CS5328E, CS5350E pinout