Automotive System
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Automotive System

Views: 0     Author: Site Editor     Publish Time: 2020-09-29      Origin: Site

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1. Primary side protection of automotive power supply

2. ESD Protection

● CAN, FlexRay, LCDS Interface Protection

● NFC antennas

● Digital and analog I/O

● RS-232 and RS-485

● USB2.0 and USB 3.0


Primary Side Protection of Automotive Power Supply


Automotive electronic products such as electronic control units, sensors and entertainment systems are connected to a power source. The power source of these electronic products is a battery or a generator. Due to the influence of temperature, working conditions and other conditions, the output voltage of the battery or the generator is unstable.

In addition, automotive systems that use electromagnetic loads such as fuel injection, valves, motors, electricity, and hydrolysis controllers introduce ESD, spike noise, and several transient and surge voltages into power and signal lines. 

When the engine is running and the generator is delivering current to the power cord of the car, if the battery is suddenly disconnected, the most serious inrush current will be generated. This situation is also called "load dump". Most car manufacturers and industry organizations have specified the maximum voltage, line impedance, and duration in this load dump situation.

Into the high power TVS is used to protect easily damaged circuits from electrical overstress and ensure high reliability. For primary protection, TVS should absorb the high energy in the case of load dump. YINT's SM8 series is suitable for such situations.


Take the 14V power system as an example:

Part number  VR
VBR  IT
Max reverse leakage Ipp  VC
SM8S24 24 26.7-32.6  5mA 10uA  153  43
SM8S24A 24 26.7-29.6 5mA 10uA  170  38.9


ESD Protection


For many years, ESD protection has been a topic of concern for electronic system design. At present, with the miniaturization and high integration of products, the threat of ESD damage has become very important, so the ESD protection level in electronic design has become a Issues that must be considered.

Adding ESD protection to the system is also a low-cost, simple way to prevent some problems in the product life cycle: If there are hidden ESD hazards in the system, it may reduce the product life,cause product failures, failures, and increase The after-sales cost of the product may cause product recalls and damage the company's reputation when serious.

YINT can provide more than hundreds of ESD protection programs and program combinations. This application guide covers automotive and industrial applications. For more information, please visit our official website http://www.yint.com.cn/cn/

CAN


YINT's solution can protect the CAN bus from ESD and other transient damage

Part number

VRWM IR(µA) VBR
IT(mA) IPP(A) Ppk(W) C(pF) Package IEC6100-4-2

ESDLC

24VAP

24
1 26.7  1 5 300 60 SOT-23 Air 15KV

ESDLC

24VD3B

24 1 26.7  1 5 350 0.4 SOD323 Air 15KV

FlexRay


YINT's solution can protect the Flexray bus from ESD and other transient damage, and meet the Flexray 10M/s transmission rate, and can absorb 300W of 8/20 μs surge energy.

Part number

VRWM IR(µA) VBR
IT(mA) IPP(A) Ppk(W) C(pF) Package IEC6100-4-2

ESDLC

24VAP

24
1 26.7  1 5 300 60 SOT-23 Air 15KV

ESDLC

24VD3B

24 1 26.7  1 5 350 0.4 SOD323 Air 15KV

CAN


ESD0524P is specially designed to protect the high-speed interfaces such as LCDS, HDMI and display port of the in-car network to avoid ESD damage.

It has the characteristics of convenient design and parasitic capacitance.

Part number

VRWM

IR(µA)

VBR

IT(mA) IPP(A) Ppk(W)

C(pF)

Package IEC6100-4-2

ESD0524P

5 1 6 1 5
150 0.35
DFN-10-

2.5*1.0*0.6

-0.5

Air 15KV

NFC antennas


NFC is a short-range, high-frequency radio technology that operates at a distance of 20 cm at 13.56MHz. Usually in NFC design, the NFC antenna is connected to the NFC control IC through a small contact, and these contacts are easily damaged by ESD, which can lead to the failure of the control IC, so it is strongly recommended to adopt the audio solution.

Part number

ESD0402/18P080

ESD0402/24P080

VRWM 18
24
IR(µA) 1 1
VC 65
80

C(pF)

0.8
0.8
IEC61000-4-2 air 15kV

air 15kV

Digital I/O


There are many ways to protect digital I/O ports. Since it is not a high-frequency interface, low capacitance is not necessary. You only need to consider one-way and two-way, several lines need protection, and packaging issues.

Part number VRWM IR(µA) VBR IT(mA) IPP(A) Ppk(W) C(pF) Package
ESD5V0D5/B 5 0.08 6.2 1 9.4
174
80 SOD523
ESDLC3V3D3/B 3.3 1 5.1 1 30 350 0.4 SOD323
ESD5V0AP/B 5 1 6 1 24 300 200 SOT-23
ESD5V0D3/B 5 1 6.2 1 24 350 350 SOD323
ESDLC5V0D3/B 5 1 6.2 1 24 350 0.4 SOD323
ESD5V0D9 5 1 6 1 88 102 30 SOD923
ESD5V0L4
ESD5V0J4
5 5 6 1


SOT-553
SOT-353
ESD5VM5
ESD5VK5
5 5 6 1 12.5

SOT-563
SOT-363


Analog I/O


ESD for analog signals has the following requirements: high turn-off voltage, low leakage current, and finally packaging requirements.

Part number VRWM IR(µA) VBR IT(mA) IPP(A) Ppk(W) C(pF) Package
ESD36VD3/B 36 1 40 1 4
350
40 SOD323
ESD24VD3/B 24 1 26.7 1 5 350 60 SOD323
ESDLC24VD3/B 24 1 26.7 1 5 350 0.4 SOD323
ESD24VAP 24 1 26.7 1 5 300 60 SOT23
ESD36VAP 36 1 40 1 4 300 40 SOT23
ESD24VD5/B 24 1 26.7 1 3 200 25 SOD523


RS-232 and RS-485


YINT provides a variety of products that can well protect RS-232 and RS485 interfaces.

As shown in the figure on the right,  ESD15VAP is used for unidirectional protection and ESD12VAPB is used for bidirectional protection. The added resistance can further limit the current entering the transceiver.

Part number VRWM IR(µA) VBR IT(mA) IPP(A) Ppk(W) C(pF) Package
ESD15VAP 15 1 16.7 1 10 300 80 SOT-23
ESD12VAPB 12 1 13.3 1 12 300 100 SOT-23

USB2.0


The characteristic of the USB2.0 standard is that the maximum signal transmission speed is 480Mbit/s, which is currently the most common interface. The picture on the right is the electrostatic protection scheme of YINT's USB2.0 bus.

Part number VRWM IR(µA) VBR IT(mA) IPP(A) Ppk(W) C(pF) Package
ESDSR05-4 5 1 6 1 12.5 500 2.5 SOT23-6L

USB3.0


USB3.0 is also considered as Super Speed USB, 5Gbps full duplex, ultra-high speed and line impedance limitation, it is a challenge to not only have no effect on the signal, but also to achieve ESD protection.

YINT's ESD0524P is specially designed for this purpose. The precise clamping voltage, low parasitic capacitance and superior performance are your ideal choice.

Part number VRWM IR(µA) VBR IT(mA) IPP(A) Ppk(W) C(pF) Package
ESD0524P 5 1 6 1 5 150 0.35 DFN-10-2.5*1.0*0.6-0.5



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