VISHAY Load Dump TVS Series for 24 V Powertrains
◆As more trucks and buses are built with complex electrical systems,load dump protection is an important safety feature for vehicles with 24 V powertrains.This article describes the changes to the load dump test condition and defines the maximum surge suppressing capability for Vishay load dump TVS series in these conditions.
★The New ISO Standard ISO-16750-2(2010)vs.the Old ISO Standard ISO-7637-2(2004)
◆The most significant difference between the new and old load dump tests is that the new standard(ISO-16750-2,2010)requires 10 pulses in 10 minutes with a one-minute interval per pulse,as shown in Table 1.The old standard (ISO-7637-2,2004)required only a single pulse.
◆The test condition of the 10 pulses in 10 minutes shows the reliability of the load dump protection device,which assists the circuit designer in selecting the best device based on surge capability in high-temperature conditions.
★Load Dump Protection for 24 V Systems Using an AEC-Q101-Qualified TVS Series Device
◆Figure 1 illustrates the load dump protection device clamping in the specified voltage range,which is different from the standard waveform.The active voltage range of the clamping device in the load dump pulse is the reason for this difference,as shown in Figure 1.The device in Figure 2 is clamping at 202 V U-s,3.5Ω Ri,and a 350 ms pulse width.
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Please see the document for details |
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English Chinese Chinese and English Japanese |
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2017/11/05 |
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