Review of XY-SEP4 4A Buck-Boost Converter Meter Charger with Display

In this tutorial, we will be reviewing the XY-SEP4 buck-boost converter, which is designed to handle input voltages ranging from 5 to 30 volts and output voltages from 0.5 to 30 volts. This module is capable of delivering up to 4A of current, making it suitable for a variety of applications, including battery charging and powering devices. The converter features a display that provides real-time information on voltage, current, and power, along with various protection features.

XY-SEP4: Overpower Protection — XY-SEP4: Over Power Protection

The XY-SEP4 converter is notable for its ability to switch between buck and boost modes, allowing it to adapt to different input and output scenarios. It also includes several safety mechanisms, such as over-voltage and over-current protection, which help prevent damage to the module and connected devices. For a detailed visual guide on how to use this module, be sure to check out the associated video (in video at 00:00).

Hardware Explained

The XY-SEP4 is built with several key components that enable its functionality. At its core, it includes a microcontroller that manages the operation of the module, driving the display and processing user inputs. The display driver is responsible for rendering the information shown on the LCD, which includes voltage, current, and power readings.

Additionally, the power section consists of various components, such as MOSFETs and diodes, that facilitate the buck-boost conversion process. The main MOSFET used in this module can handle up to 60 volts and 50 amps, allowing it to efficiently manage high loads. The design also incorporates thermal protection features to prevent overheating during operation.

Datasheet Details

Manufacturer	New Photon
Part number	N7600
Logic/IO voltage	5 V
Supply voltage	5–30 V
Output current (per channel)	4 A max
Peak current (per channel)	5 A max
PWM frequency guidance	180 kHz
Input logic thresholds	0.8 V (high), 0.3 V (low)
Voltage drop / R_DS(on) / saturation	50 mΩ (typ.)
Thermal limits	100 °C shutdown
Package	Standard PCB mount
Notes / variants	Various input/output configurations available

Ensure proper heatsinking to manage thermal performance.
Use appropriately rated wires to minimize voltage drop.
Pay attention to the polarity of connections to avoid damage.
Set current limits to prevent overloading the module.
Adjust voltage settings gradually to avoid sudden spikes.
Monitor temperature during operation to prevent overheating.
Be cautious with load connections when testing.
Utilize proper safety measures when charging batteries.
XY-SEP4: Screenshot of Effeceiency

Wiring Instructions

To wire the XY-SEP4 buck-boost converter, start by connecting the power supply to the input terminals. The positive input terminal is typically labeled as VIN+, while the negative terminal is labeled VIN-. Ensure that your power supply voltage falls within the specified range of 5 to 30 volts.

Next, connect the output terminals to your load or battery. The positive output terminal is labeled VOUT+, and the negative output terminal is VOUT-. Be careful to connect these correctly to avoid reverse polarity issues. If your setup involves a battery, make sure to set the output voltage to the appropriate level for charging.

Finally, if applicable, connect any additional control buttons or display interfaces to the designated pins on the converter. Make sure to refer to any documentation provided with the module for specific pin assignments.

Code Examples & Walkthrough

As there are no specific code snippets provided for this module, the operation mainly relies on the built-in functionality and user interface of the converter. The key identifiers you would interact with include settings for outputVoltage, currentLimit, and inputVoltage. These parameters can be adjusted using the onboard buttons, allowing for real-time changes to the output based on your requirements.

For example, when setting the currentLimit, you would create a short circuit to adjust the maximum allowable current before disconnecting it to resume normal operation. This feature is crucial for safely charging batteries and ensuring that the module operates within its limits.

Demonstration / What to Expect

Upon powering the XY-SEP4 converter, the display should light up, showing the current output voltage and current readings. You can expect the module to adjust the output based on the set parameters, such as current limit and voltage settings. If the load exceeds the specified limits, the module will automatically shut down to prevent damage, as indicated by the display.

Common pitfalls include mistakenly setting the output voltage too high or connecting a load that draws more current than the module can handle. Monitoring the display closely during operation will help prevent these issues and ensure safe usage (in video at 10:00).