Field effect transistor MOSFET is a voltage-controlled element, which is widely used in consumer electronics, electric vehicles, power management,Industrial applications, lighting and other fields. MOSFET can be turned on as long as the required voltage is added to its voltage-controlled element. Its turn-on is just like that of a triode in a saturated state, and the voltage drop at the junction is the smallest, which is the classic switching function. Using MOSFET as a switch can also reduce power consumption and have better switching characteristics.

LCE15P25JK introduced by Leimao can replace IRF6215SPDF of IR brand, but customers have problems in use. In view of the problems of customers, the quality control department of Leimao analyzes and puts forward solutions.

Customer feedback: using LEIDITECH brand LCE15P25JK instead of IR brand IRF6215SPDF will appear.

CE problem is conduction disturbance. This MOSFET LCE15P25JK is connected in series with the positive pole of the power supply for switching, which will cause power quality problems on the power supply line, and then other devices connected to the same power supply will not work normally.

Anatomical analysis:

Only when the electrical parameters of the two products are different, the Vth of LEIDITECH brand LCE15P25JK is 5.7V, and the Vth of IR brand IRF6215SPDF is above 8V-9V.

The customer's Vgs is fixed at -10V, which is higher than 5.7V.

Initially, it is considered that the voltage is turned on too early.

The following is the analysis chart:

IRF6215SPDF of IR brand

LEIDITECH brand LCE15P25JK

Solution:

1. It is not difficult to design a MOS model that meets the requirements technically, but the opening cost is high and the market consumption can't support the cost. Discard this method.

2. The customer reduces the driving voltage. After discussion, the customer can reduce the driving voltage. Optimal scheme.