1. The TP4056 is packaged in an SOP8-PP package. During use, the bottom heat sink and PCB must be soldered properly. The heat dissipation area on the bottom should have holes filled for better thermal performance. A large copper area helps dissipate heat efficiently. Using a multi-layer PCB with sufficient vias can further improve heat management. Poor heat dissipation may trigger temperature protection, reducing the charging current. Adding appropriate vias on the back of the SOP8 package makes manual soldering easier, as the solder can be applied through the vias to ensure a solid connection to the heat sink.
2. When using TP4056 for high-current charging (700mA or more), it's important to increase the heat dissipation resistance. The recommended resistance range is 0.2~0.5Ω. Customers should choose the right resistor size based on their application requirements.
3. In the TP4056 circuit, the 10uF capacitor connected to the BAT terminal should be placed as close as possible to the chip’s BAT pin. Keeping this distance short ensures stable operation and reduces noise interference.
4. During testing, the BAT terminal should be directly connected to the battery. Avoid connecting an ammeter in series with the BAT terminal. Instead, connect the ammeter to the VCC terminal for accurate readings.
5. To protect the TP4056 from voltage spikes and glitches, it's highly recommended to place a 0.1uF ceramic capacitor near both the BAT terminal and the power input. These capacitors should be placed as close as possible to the chip for optimal performance.
6. TP4056 should not be used with reversed batteries, as this can damage the device. The chip includes a built-in reverse polarity protection circuit for lithium batteries, but users should still exercise caution to avoid accidental reverse connections.
It is advised to use a power supply between 4.4V and 5V. The 4.2k~10k ohm resistor may vary depending on the model—common values include 4.2k, 5.1k, or 10k. The Rx resistor is a voltage-regulating component. Initially, you can short it with a wire and then adjust the resistance based on the cutoff voltage.
1. For proper operation, use a power supply between 4.7V and 12V with constant current. This ensures stable performance during charging.
2. If you plan to add a thermistor at the thermal port, make sure to remove the corresponding resistor to prevent false readings from the MAX1879.
3. When selecting the pad for 3.6V or 4.2V, ensure it is properly aligned with the Li-ion battery for safe operation.
Always follow the wiring instructions carefully. If the battery is connected in reverse, the LED will light up blue as a warning.
1. Input power: If using MAX1879, a power supply of 5V to 13.2V is required. The minimum operating voltage is 5V, so ensure the input voltage remains above 5V throughout the process. If the voltage drops below 5V, the MAX1879 may not function correctly or reduce the charging current. It's recommended to use a power supply of at least 5.2V and a charging current of 2A or higher. Due to voltage drop in high-current applications, many power supplies might not maintain the necessary 5V, so a higher voltage like 5.2V is advisable.
2. For input voltage when driving MCE or P7 LEDs, the range is 4.1V to 13.2V, compatible with both 2S and 3S Li-ion batteries.
3. The output current range for devices like MAX1879 is 0.5A to 3A. While I've tested up to 5A, it's not recommended due to lack of verification for such high currents.
4. When driving MCE or P7 LEDs, the output current can go up to 6A. You may use two units in parallel, if needed.
5. The current adjustment interface was set to 1.5A before shipping. If you need a different current, you can remove the existing resistor and replace it with a new one. Since the pads are exposed for demonstration purposes, the resistor isn't soldered on the PCB. You can also use an external potentiometer for adjustment, though it's less reliable. It's best to adjust to the desired current and then replace the potentiometer with a fixed resistor. Keep the lead wires short, as the pad is part of a high-gain amplifier circuit that can be easily affected by noise. Below are common resistance values for standard current settings.
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