Overvoltage Protection in Automotive Systems Figure 1. Discrete overvoltage protection circuit. How it Works The main pass element in the protection circuit shown in Figure 1 is the PNP transistor Q1. Care should be taken in selecting this part, as any power supply voltage drops will be determined by the characteristics of this transistor. A Zetex FMMT718 device has been used for this duty. Overvoltage Protection in Automotive Systems Maxim Figure 1. Discrete overvoltage protection circuit. How it Works The main pass element in the protection circuit shown in Figure 1 is the PNP transistor Q1. Care should be taken in selecting this part, as any power supply voltage drops will be determined by the characteristics of this transistor. A Zetex FMMT718 device has been used for this duty. APPLICATION NOTE m.littelfuse (see Figure 3). The main disadvantages are: 1. No noise immunity. 2. The minimum input voltage range is 9.5 V, so you are restricted to use it 1for higher voltages or to supplement it by feeding in an auxiliary supply voltage. THE SCR CHOICE The use of the SCR crowbar overvoltage protection circuits in DC power supplies has been, for many years, a Over Voltage Protection for Automotive Load Dump ... The Over Voltage Protection Circuit for Automotive Load Dump shown in Figure 1 is a perfect series disconnect or series cut of circuit which has been built to safeguard a switching regulator load that possessed an optimum input voltage of 24V. New, Robust Approach to Overvoltage Protection for ... Figure 1. Traditional overvoltage protection design with additional discrete components If a positive transient voltage pulse occurs, it is clamped with a current through diode D1 to VDD. The voltage is thereby limited to VDD plus the diode forward voltage. Over Voltage Protection for RS 485 Bus Nodes EE Power Figure 3: Integrated versus discrete over voltage protection designs. Figure 3 shows that the discrete solution already becomes cumbersome by merely providing the basic functions for over voltage protection, while still lacking a current limiter, which is a vital component for over voltage protection. Overvoltage Protection in Automotive Systems chinabaike Figure 1. Discrete overvoltage protection circuit How It Works The main pass element in the protection circuit shown in Figure 1 is the PNP transistor Q1. Care should be taken in selecting this part, as any power supply voltage drops will be determined by the characteristics of this transistor. A Zet ex FMMT718 device has been used for this duty. Protecting 5V 1 Wire® Slaves from Overvoltage Ex Maxim The circuit in Figure 7 is functionally equivalent to the one in Figure 4, but has a better performance and imposes a much lower load on the 1 Wire master. Its protection level is 40V, limited by Q2. The protection level can be increased by choosing a transistor with a higher V CE breakdown voltage.

figure 1 discrete overvoltage protection circuit Gallery


how an efuse can help provide robust industrial power path

how an efuse can help provide robust industrial power path

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