Discover detailed insights on SY3408-2L-CK-5V, TWS Y113 repairs, and MZ Wireless EarBuds circuit details. Get expert tips on TWS case charging IC FH8208
Overview of the Board SY3408-2L-CK-5V
Overview of the Y113 / SY3408 Circuit:
This specific board (SY3408-2L-CK-5V) is used to charge both the earbuds and the battery inside the charging case. The following components are key to the circuit's function
↳ Board Number: SY3408-2L-CK-5V
↳ Others Board: Y113-C
↳ Board Version: V1.1
↳ Application Type: AirPods/EarBuds Charging Circuit and Earbuds Charging Board
Components
1. Charging Connector
2. Coil
3. Power Bank Charging IC
4. EarBuds Charging IC
5. Battery
6. Resistor, Capacitor.
Let's explore each part step-by-step, explaining how these components interact to power the device.
Charging Section
↳ Charging Connector Type: Type C (Apple Compatible)
↳ Charging Input Voltage: 5.2Volt
↳ Charging Input Ampere: 2 Ampere
↳ LED Indicator: Blue LED lights up during charging
↳ Charging Time Load Ampere: 0.05-0.20A
Charging Type C Working
The Type-C charging connector is the input port through which external power (from a charger or USB power source) is supplied to the wireless earbuds charging case. The 5.2V input is delivered to the internal circuit, which then distributes the power to charge both the internal battery and the earbuds themselves.
Charging Flow
The charger supplies 5.2V through the Type-C connector.
This power is fed into the circuit, which is managed by the charging IC and distributor IC.
The blue LED acts as an indicator, showing that the device is actively charging. Depending on the battery's state and the power required at the time, the charging current may range from 0.05A to 0.20A.
Power Bank Charging IC (FH8208)
IC Number: FH8208
Serial Number: 2314
Total Pins: 5
Working FH8208 IC
The Power Bank Charging IC (FH8208) controls the charging of the case’s internal battery, ensuring it is charged safely and efficiently. This IC regulates the incoming power from the Type-C connector to ensure that the battery receives the correct voltage and current.
FH8208 IC Functions
Voltage Regulation: Ensures that the 5.2V input does not exceed the safe charging limits for the internal battery.
Current Management: This function distributes the correct current to charge the battery at a safe rate, preventing overheating or overcharging.
LED Indicator Control: Likely manages the blue LED to show charging status based on the current battery level and charging progress.
This IC plays a critical role in ensuring that the charging process is efficient and safe, protecting both the battery and other internal components from damage.
Earbuds Charging IC (SY3408) / Power Distributor IC
IC Number: SY3408
Serial Number: 2307A5
Manufacture Code: Q3Q19B
Total Pins: 8
SY3408 IC Working
The SY3408 IC serves as the power distributor between the charging case and the earbuds themselves. This IC ensures that when the charging case is connected to power, the internal battery is charged first. Once the battery reaches an optimal level, it distributes power to the individual earbuds.
SY3408 IC Functions
Power Distribution: Ensures that power is supplied to the earbuds for charging when connected to the charging case.
Smart Charging: Manages how much power each earbud receives to ensure they charge evenly. This IC also monitors when the earbuds have reached full charge, at which point it cuts off power to avoid overcharging.
Battery Management: Prevents the battery from draining too quickly by controlling how power is used during charging and operation.
Coil Details
↳Coil Number: 2r2
↳ Coil Value: 2.2 uH
↳ Coil Max DC current: 4.1 A
↳ Coil Max DC resistance: 16.7 mΩ
↳ Coil Self-resonant frequency: MHz
↳ Coil Tolerance: ± 20%
↳ Coil Package/case: 0735
↳ Coil Shielded: Yes
↳ Coil Core Material: Ferrite
↳ Coil Operating temperature -40 to +125°C
↳ Coil Dimensions: 7.6 mm x 7.6 mm x 3.5 mm
2r2 Coil Working
The coil in this circuit is used for inductive purposes, commonly employed in filtering or managing energy flow between components. In this case, it likely helps with boosting conversion or current smoothing, reducing electrical noise and ensuring stable power delivery.
Energy Storage: When power flows through the coil, it creates a magnetic field, storing energy temporarily. This allows for smoother current flow and helps regulate the power supply for components like the charging IC and earbuds charging IC.
Current Regulation: The coil is designed to handle up to 4.1A of current, meaning it is well-equipped to manage the power demands of the charging circuit without overheating.
Its ferrite core allows for efficient energy management, while its shielded design prevents interference with other electronic components in the small form factor of the earbuds charging case.
Battery Information
↳ Battery Ampere: 250 mAh
↳ Battery Voltage: 4.2 Volt
Battery Working
The internal Li-Polymer battery stores the energy needed to power the earbuds and the case itself. This 250mAh battery provides ample capacity to charge the earbuds multiple times before needing to be recharged.
Battery Functions
Power Supply: Provides the necessary power to the earbuds when they are not connected to an external power source.
Voltage Regulation: The Power Bank Charging IC ensures the battery does not exceed its 4.2V charging limit, while the SY3408 IC helps regulate battery output to the earbuds.
Efficiency: Li-polymer batteries are known for their high energy density and efficiency, which is why they are commonly used in small devices like earbuds.
Resistors and Capacitors
Resistors
Resistors are small components that manage the flow of current within the circuit. They ensure that sensitive components like the charging IC and earbuds charging IC receive the correct amount of current, preventing overloads.
Resistor Functions
Current Limiting: Controls how much current flows through certain parts of the circuit, protecting sensitive components.
Voltage Division: Helps manage voltage levels across different parts of the circuit.
Capacitors
Capacitors store electrical energy and release it when needed to smooth out voltage fluctuations. This ensures a stable power supply, particularly when dealing with rapidly changing loads like when the earbuds begin or stop charging.
Capacitor Functions
Energy Storage: Stores energy temporarily and releases it to smooth out sudden changes in current demand.
Noise Reduction: Helps eliminate electrical noise, improving the stability and performance of the circuit.
How These Components Work Together
Now that we’ve explained the role of each component, let’s look at how they work together to power the MZ Wireless EarBuds charging system.
Charging the Case Battery:
When you connect the charging case to a power source via the Type-C connector, the external power (5.2V) flows into the circuit.
The Power Bank Charging IC (FH8208) manages the incoming power, ensuring it is delivered safely to the Li-Polymer battery. This IC also controls the blue LED indicator, showing the charging status.
The coil helps smooth the current flow, preventing voltage spikes or drops that could damage the circuit.
As the battery charges, the capacitors store excess energy and release it to stabilize the voltage as needed. Resistors limit the current to ensure no components are overloaded.
Charging the Earbuds:
Once the battery is charged, the Earbuds Charging IC takes over, distributing power to the earbuds.
The SY3408 IC manages how much power each earbud receives, ensuring it charges evenly and efficiently.
The resistors and capacitors continue to manage the flow of electricity, preventing surges that could harm the delicate electronics within the earbuds.
When the earbuds are fully charged, the SY3408 IC cuts off the power supply to avoid overcharging, which helps prolong the lifespan of the earbuds.
Conclusion of MZ Wireless EarBuds SY3408 Earbuds
The MZ Wireless EarBuds SY3408-2L-CK-5V charging circuit is a well-designed system that ensures efficient, safe, and reliable charging for both the case’s internal battery and the earbuds. Each component, from the charging connector to the tiny capacitors, plays a crucial role in maintaining the device's performance and safety. Understanding how these components work together helps illustrate the complexity and efficiency of modern wireless earbud charging circuits.
FAQs
What is the number of MZ wireless earbuds CPUs?
➔ MZ wireless earbuds CPU Number Is SY3408
What is the battery Capacity Of MZ wireless earbuds?
➔ MZ wireless earbuds Battery Capacity is 250mAh