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How to Test MOSFETs in Motor Controllers?
1. Preliminary Visual Inspection Check the appearance of the MOS tube first. Observe whether the chip surface is burnt, the pins are burned open‑circuit, the solder joints are cracked or the plastic package bulges. If obvious damage is found, the device is directly judged defective without fur...Read more -
How to Eliminate or Suppress the Miller Effect
The Miller effect comes from the parasitic Miller capacitance Cgd between gate and drain of MOSFET. During switching, the drain‑voltage swing couples current into the gate loop. It causes gate voltage platform (Miller plateau), slows switching speed, increases switching loss, may induce false tu...Read more -
Popular MOSFET Brands on the Market
1. Popular international brands 1.1 Infineon (Germany) 1.1.1 Strengths：The global top‑tier power semiconductor vendor. OptiMOS series for low‑voltage applications, CoolMOS super‑junction series for high‑voltage AC‑DC power supplies. Excellent consistency and reliability, full automotive‑gra...Read more -
Which Companies Lead in FET / MOSFET Technology？
1. International leading manufacturers 1.1 Infineon (Germany) Global top‑ranked power MOSFET supplier, full‑voltage‑range technology leader. Low‑&‑medium‑voltage：OptiMOS 5/6 SGT shield‑gate MOSFET, widely used for server power, automotive BMS, battery protection boards. Low \(R_{DS(o...Read more -
Two MOSFETs Connected in Series as Power Switch
1. Ordinary series connection (Drain‑to‑Source cascade) This topology connects the source of the first MOSFET to the drain of the second MOSFET. Both devices sit on the same current path. 1.1 Core purpose Increase the overall withstand‑voltage capability. When single‑device voltage rating ...Read more -
What Are the Functions of MOSFETs in Lithium‑ion Battery Protection Boards?
1. Over‑charge protection When the battery cell voltage rises to the over‑charge threshold after full charging, the protection IC sends a signal to turn off the charge MOSFET. The charging path is physically disconnected, and external power cannot continue to charge the battery. This prevent...Read more -
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
