Shunt voltage reference

There are two types of voltage references, shunt references and series references. Each type has its own usage conditions and the process of selecting between the two can be intimidating.

When designing a system for applications ranging from automobiles to simple temperature measurements, interfacing with the analog world typically requ When designing a system for applications ranging from automobiles to simple temperature measurements, interfacing with the analog world typically requires data converters digital-to-analog and analog-to-digital , sensors, or other application-specific integrated circuits ICs. Accurate measurements require a reference voltage that does not fluctuate with system conditions such as input voltage or ambient temperature. A voltage-reference IC provides the steady voltage other ICs use to make measurements with the required accuracy. There are two types of voltage references: shunt references and series references.

Shunt voltage reference

You can also set the cathode current using the various resistors in series with the supply. This external resistor quick-start calculator tool lets you easily calculate valid external resistor values relative to voltage reference, supply and load-current bounds. With these inputs, you can instantly view the resulting calculations and use the color-coded indications to understand Use our reference design selection tool to find designs that best match your application and parameters. Minimize idle power consumption with low-quiescent current I Q shunt voltage references. Low idle power consumption in the power supply can help you design Energy Star-rated appliances and small but reliable power adapters. Our low-I Q shunt voltage references can help your power-supply designs achieve low standby power and longer battery run times, while lowering system costs. Minimize power consumption and extend battery life with our high-accuracy shunt references. Some power supplies, such as those used in servers and industrial instruments, accuracy and stability requirements demand more precise voltage references that can keep the output accurate across changes in input voltage, output load and operating temperature. Our portfolio of high-accuracy, low-temperature coefficient shunt voltage references help enable a more efficient power supply. In hybrid, electric and powertrain systems, shunt voltage references ensure feedback loop control and accuracy in system diagnostics. Our shunt voltage references are available in a range of voltage options and package sizes to meet your system requirements without draining power.

Dean, Christopher.

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In part three of our Understanding Voltage References series, my colleague Marek Lis talked about how to achieve shunt reference flexibility with series reference precision. Figure 1: TLV as a comparator. In a typical adjustable shunt reference application, the output is fed through a resistor divider to the feedback pin, such that the feedback pin is equal to the internal reference voltage during steady state. In the schematic shown in Figure 1 , the TLV adjustable shunt reference is configured for open-loop operation, which means that the output is not connected to the feedback pin. Instead, the signal V X drives the feedback pin through a resistor divider. The resistor divider is set such that the value at the feedback pin is equal to the internal reference voltage when V X is at the threshold voltage, V TH. This configuration is similar to running an op-amp in an open loop, and driving the positive terminal with V X. However, instead of having to create a reference with another supply or a resistor divider for the negative terminal, the comparator reference voltage is internal to the part. The output V OUT is driven high to V IN when the internal reference voltage is less than the threshold voltage, and is driven low when the internal reference voltage is greater than the threshold voltage. These conditions are summarized in Table 1 and illustrated in Figure 2.

Shunt voltage reference

When designing a system for applications ranging from automobiles to simple temperature measurements, interfacing with the analog world typically requ When designing a system for applications ranging from automobiles to simple temperature measurements, interfacing with the analog world typically requires data converters digital-to-analog and analog-to-digital , sensors, or other application-specific integrated circuits ICs. Accurate measurements require a reference voltage that does not fluctuate with system conditions such as input voltage or ambient temperature. A voltage-reference IC provides the steady voltage other ICs use to make measurements with the required accuracy.

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The resistor sets the total current sourced by the input supply as a function of the supply voltage. Power management. In this case, the operating current of the reference is added to the load current, along with the supply current of the microcontroller, to calculate the average load on the battery Equations 3, 4 :. Benefits: Micropower shunt references in small footprints Low output drift vs. The LM 2. Voltage reference product overview 3. Benefits: Adjustable voltage options from 2. View reference designs. In the meantime, visit www. Voltage references. Which topology is right for you? Selection guide. Figure 7 shows a series voltage reference device that does not require an external resistor. Benefits: Fixed and adjustable shunt reference selection 1-mm-bymm package size Low quiescent current options for battery-operated applications.

You can also set the cathode current using the various resistors in series with the supply.

However, connect it to a lower potential in the circuit instead of connecting the second terminal to ground Figure 4 , where V2 marks the lower potential. Minimize power consumption and extend battery life with our high-accuracy shunt references. Selection guide. In infotainment systems, shunt voltage references in flyback converters handle feedback loop control and precision referencing for internal analog-to-digital converters ADCs. For example, an industrial application requires a 2. When designing a system for applications ranging from automobiles to simple temperature measurements, interfacing with the analog world typically requ Up 0 Down Reply More Cancel. Accurate measurements require a reference voltage that does not fluctuate with system conditions such as input voltage or ambient temperature. Series reference use cases: Variation in load current, where a series will see lower for lighter loads. A series reference is best when the load current may change often, while the input voltage is fairly constant and within the bounds of the device limits. The shunt reference in Figure 3 regulates the reference voltage by acting as a variable current sink, effectively creating a variable resistor divider with R S to provide a constant voltage at the output node. Understanding Voltage References: Shunt vs series. Benefits: Micropower shunt voltage references in small footprints Low output drift vs.