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Impacts Caused by Damaged Anti-Reverse MOSFET
1. Definition of Anti-Reverse MOS Anti-reverse MOS is a power MOS arranged in the charging input path, mainly to block reverse current when the adapter is plugged reversely, or when battery voltage surges back to damage the charging chip. It is often configured as back-to-back NM...Read more -
What is Charge MOSFET (Charge MOS)?
1. Basic Definition Charge MOSFET is not a dedicated special type of MOS device. It is a universal industry term referring to the power MOSFET placed on the battery charging circuit path. Controlled by BMS or charging management IC, it governs charging voltage, current and all sa...Read more -
How to Choose MOSFETs for High-Frequency BLDC Fan & Motor Drive Applications?
For BLDC fan, industrial motor control and synchronous buck power boards, switching frequency keeps rising to lower noise, shrink PCB size and boost efficiency. Many hardware engineers struggle with overheating, EMI noise and short service life after selecting unsuitable dual N+P MOSFETs. Toda...Read more -
MOSFET Key Characteristics
Introduction MOSFET (Metal‑Oxide‑Semiconductor Field‑Effect Transistor) is a voltage‑controlled semiconductor device widely adopted in power supplies, BLDC motor drives, signal switching and analog circuits. Different from current‑driven BJTs, the MOSFET is controlled by gate‑sou...Read more -
Back-to-Back NMOS: Principle, Structure and Working Mechanism
1. Circuit Structure Two identical N-channel MOSFETs are connected source to source. - The two drain pins become the two main power terminals. - The two gates are driven independently. - The two intrinsic body diodes face opposite directions, canceling each other’s one-way conduction character...Read more -
What Key Parameters Should You Focus On When Selecting MOSFETs?
1. Drain-Source Voltage Rating (V₍DSS₎) VDS is the maximum sustainable voltage between drain and source when the MOSFET is off. Rule of thumb: Select a VDS with at least 30% voltage margin above the circuit’s maximum operating drain voltage. Voltage spikes from inductive loads (BLDC motors, ...Read more -
How Much Current Is Required to Drive a MOSFET?
Many engineers hold a misunderstanding: MOSFETs are voltage-controlled devices, so no driving current is needed. In fact, almost no current flows through the gate under steady-state conditions. However, instantaneous peak current is required to charge and discharge the gate capacitance during ...Read more -
Difference Between Unipolar SPWM & Bipolar SPWM
1. Basic Definition SPWM (Sinusoidal Pulse Width Modulation) is widely used for BLDC sine drive, single-phase / three-phase inverters, UPS and power converters. According to the level of output voltage during switching, it is divided into unipolar SPWM and bipolar SPWM. 2. Core Working Principle ...Read more -
Operating Frequency Range of SiC MOSFET
1. Core Overview In theory, SiC MOSFET supports switching frequency up to 1 MHz or higher. However, the practical operating frequency is restricted by topology, power level, heat dissipation and EMI conditions. We need to distinguish theoretical capability and mass-production mature frequency ran...Read more -
Advantages of Silicon Carbide (SiC) Power Devices
1. Overview Silicon Carbide (SiC) belongs to wide bandgap semiconductor materials. Compared with traditional silicon power devices (Si MOSFET, IGBT), SiC power devices have inherent physical advantages, making them the preferred solution for high-voltage, high-frequency, high-efficiency power con...Read more -
Silicon Carbide (SiC) vs Silicon MOSFET: Advantages & Disadvantages
1. Introduction Traditional power switches adopt silicon-based MOSFET. In recent years, SiC MOSFET has been widely used in high-voltage, high-frequency scenarios such as EV chargers, energy storage, solar inverters and high-power BLDC controllers. Many designers are confused about how to sel...Read more -
What Is the Function of MOSFET in Antenna Circuits?
1. Overview MOSFETs are core control components inside antenna RF front-end circuits, widely used in mobile phones, BLDC remote control, WiFi, Bluetooth, RFID, 5G base station and wireless sensor equipment. They are mainly divided into RF small-signal MOS (for signal switching/tuning) and po...Read more
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