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QX5252: How to Use the Solar LED Driver IC

Garden lights and street lights need to stay on, especially at night. For that reason, solar panels play a very important role. Engineers value the QX5252 ASIC for domestic and industrial lawn LED lights.

Therefore, if you are enthusiastic about making DIY LED circuits, the QX5252 will be handy. Here we cover all about this IC, how it works and how to utilize the IC in projects.

1. Qx5252 Pin Configuration 

Name of PinType of PackageTO-94 / DIP-8Type of pin
SBAT1 /  6Input pin
LX4 / 3Output pin
LS– / 5Input pin
BAT2 / 7Output pin
VSS3 / 2Ground pin
NC– / 1, 4, and 8Not connected.

To learn more, consult the QX5252 datasheet for more information.

Image showing the pins of the QX5252

Source: Creative Commons. 

(Image showing the pins of the QX5252)

2. Features and Specifications

  • Firstly, it has an operating voltage in the range of 0.9V to 1.5V
  • Next is the output current between 3mA to 300mA.
  • QX5252 has a patented over-discharge feature that lets it shut down.
  • Also, it has an inbuilt light control switching feature.
  • Further, there is a Schottky Diode built-in.
  • It requires only one external inductor and a quiescent current of 17uA.
  • This IC runs on CMOS technology and works on low power.
  • Another great feature of this IC is its automatic charge. 
  • Lastly, QX5252 comes in a DIP-8 package and 4-pin TO-94 packages.

3. How does QX5252 Work?

First, the QX5252 integrated circuit charges the rechargeable battery using the solar cells when it is still daytime. A single Ni-H battery or an AA battery, in this case, is sufficient.

It transmits power from the 2.5V solar cell to the 1.2V battery to charge. The charged battery charge voltage now boosts above 3V. It boosts battery voltage and then goes to power the LED.

However, you need to use the LED at the right voltage. Therefore, you need an inductor to serve as a boost converter. At an oscillation of about 100 kHz, the LEDs receive sufficient voltage output via the LX pin.

A diagram showing how a solar cell panel works

(A diagram showing how a solar cell panel works).

4. How to use QX5252?

The QX5252 solar LED driver works with very simple components. Next are the materials you need to get started.

Materials to prepare

  • IC1, QX5252. 
  • A solar panel.
  • A rechargeable battery – AG8 1.55V.
  • An external inductor, L1.
  • Blue LED 0805 SMD or LED of any color.

However, to effectively get the desired results, you need to set the LED power.

A bunch of AA alkaline batteries

(A bunch of AA alkaline batteries).

LED power settings

Here, the inductance helps determine the power consumed by the LED.

Flash Control Switch Settings,

On the one hand, the QX5252F driver chip allows direct control from solar panels.

The other side is the QX5252E. However, you need a normal resistance and a photosensitive resistor to use this LS side. Hence, you set the LS voltage using:

VLS = [R1/(R1+R2)] VIN

Therefore, the LED goes off when 0.3 * VIN is less than the VLS. But, when 0.22 * VIN is higher than the VLS, open the LED of the flash control switch.

A solar panel LED driver

(A solar panel LED driver).

Powering Different LEDs using the QX5252

A schematic diagram showing how to connect the QX5252

Source: Creative Commons

(A schematic diagram showing how to connect the QX5252)

Conclusion

The QX5252 is a solar LED driver with an ASIC design that uses several circuits to power LEDs. 

Designing lighting circuits yourself is easy. Especially if you have the right assistance, it even gets easier when you have all the required materials in one place. So, contact us today to get started right away.

Hommer Zhao
Hi, I am Hommer, the founder of WellPCB. So far, we have more than 4,000 customers worldwide. If you have any questions, you can feel free to contact me. I really appreciate any help you can provide.

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