Ultra-thin MWPH Series Power Inductor for TWS Earphones, with Higher Q Value and Lower Loss
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Overview
With the evolution of Bluetooth, chips, sensors and other technologies, the design of TWS earphones is becoming smaller and thinner, and the performance and size requirements of the inductor are also increasing. Compared with the conventional winding inductor, the open magnetic circuit design is optimized to semi-magnetic shielding, which reduces magnetic leakage to decrease the impact on other devices, and lessen the noise of TWS earphones. At the same time, the core material is optimized to effectively improve the current capacity, compared with the open-circuit winding inductor, the saturation current is increased by >30% and the loss is reduced by nearly 30%. The size of MWPH series ranges from 1.0*0.5mm to 1.6*0.8mm, and the inductance range is 0.33μH to 22μH. MWPH series is widely used in consumer electronics and portable medical equipment such as TWS earphones, smart watches, pads, etc.
Background
The traditional wire wound inductor is designed with an open magnetic circuit structure, which has large size and loss, while the new generation of wearable product design has higher requirements for product size and performance. Based on this background, SUNLORD Electronics relies on chip inductor platform to develop semi-magnetic shielded Power Inductor, using low-loss materials and high-precision coating processes to reduce the size and improve the product performance to meet the needs of the application side.
Features
Semi-magnetic shielded to reduce magnetic leakage.
Wide range of inductance (0.33μH~22μH), high Q, high SRF.
Ultra-thin and low profile, thickness 0f 0.5mm max.
Applications
Smart watches, TWS earphones, bracelets, etc
High-end mobile phone, Pad, etc
Small portable medical equipments
Shape and Dimensions
Electrical Characteristics
This part is the typical size & inductance, detailed information please refer to MWPH Series
New technology
Magnetic glue, semi-magnetic structure
The traditional winding inductor is coated with UV glue, which is an open magnetic circuit structure, only to protect the copper wire and facilitates the absorption of the customer's SMT. The MWPH series uses magnetic glue to reduce magnetic leakage while fixing the coil, reducing the bottom noise problem of TWS earphones.
High-precision dispensing control technology
The initial dispensing process uses air pressure dispensing, the glue fluidity is poor, resulting in the glue gathering together in the mold cavity, and lack of glue on the product body. After optimizing the formula of magnetic glue and adding control assembly design to the dispensing mechanism, the glue is easy to disperse and accurate dispensing is achieved.
Product Advantages
Smaller size and higher current compared with multilayer power inductors
Under the same size , the wire wound chip power inductor MWPH series has better saturation current, that is 350% higher than multilayer power inductors. Under the same inductance, the size of MWPH series is smaller, and the saturation current is still 60% higher than multilayer power inductors.
Higher Q and lower loss compared with molded power inductors
MWPH series has higher SRF, which can meet the higher frequency circuit applications. At high frequency, the Q value is higher and the loss is relatively small. And MWPH series has wider inductance range with 0.33μH~22μH.
Production
Mass production.
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