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In recent years, the automobile industry has entered a period of major change in vehicle structure due to the unprecedented evolution of car technology such as EV (electric vehicles), HEV (hybrid vehicles), ADAS (advanced driver assistance systems), and AD (autonomous driving). I'm welcoming you.
In proportion to this change, the requirements for vehicle noise, represented by CISPR25, have become extremely strict.
Under these circumstances, if you are reading this article right now, do you have the same concerns when designing the power supply for your in-vehicle ECU?
・To clear the noise level, the amount of design and evaluation man-hours has become enormous.
・Noise filter parts are being added more and more for noise countermeasures.
・Since this alone cannot solve the problem, additional shields are required, resulting in an increase in cost.
Products with Silent Switcher technology from Analog Devices can solve these problems.
This article introduces a silent switcher that facilitates the realization of low EMI required for automotive ECUs, which has become a major design issue.
What is a silent switcher?
Silent switchers are low EMI switching regulators from Analog Devices.
All devices in the Silent Switcher series have cleared CISPR25 Class 5 noise requirements on their own, making it possible to minimize switching regulator noise, which is a source of noise on the board.
Features of silent switchers that achieve low EMI
Here we will introduce typical features of how silent switchers achieve low EMI.
(1) Elimination of bonding wires that generate parasitic capacitance that causes noise
The Silent Switcher series uses flip-chip mounting to eliminate bonding wires that generate parasitic capacitance that causes noise.
Flip chip mounting is a method of mounting a bare chip by flipping it over, and it has the following advantages over wire bonding mounting.
-Compared to wire bonding, the wiring length is shorter and the inductance component is less.
-Space saving compared to wire bonding
-直接接続されることから、抵抗値が低く低損失を実現
(2) Magnetic field confinement by two hot loops
The main source of noise in switching regulators is the hot loop, which has the largest current fluctuations.
Furthermore, if an inductance component is added to this path, it directly leads to noise deterioration, so the theory is to make the hot loop as small as possible.
In the silent switcher, Vin is provided at both ends of the IC to separate the hot loop. In addition, the divided symmetrical current loop confines the magnetic field, significantly reducing the overall magnetic field radiating from the regulator, resulting in low EMI.
Lineup of silent switcher products
Considering the adoption of silent switchers in automotive applications, we have prepared a large lineup of high-voltage products.
New devices are released every day as the flagship product of Analog Devices.
Click here for demo video
For the silent switcher introduced so far, the highlights of the function explanation and the demonstration using the evaluation kit are shown.
It is summarized in the video, so please take a look.
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Inquiry
Regarding this product, our technical specialists can also propose devices that match the required specifications, so please feel free to contact us.
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