![]() ![]() In some cases, Quality and Reliability departments will require margining before they will approve manufactured boards.įigure 1 shows a DC-DC converter with a resistor connected to its internal Trim/Feedback Node. Margining tests typically are conducted during board debug. If the board has a number of board-mounted supplies, then the margining test should also include the variation of individual board-mounted supplies. Circuit boards are also subject to other margining tests, such as temperature, timing and noise.įor example, if the allowed tolerance of a supply input is ☑0%, the voltage margining test ensures that the board is functional when the input supply is at its margin-high (nominal voltage +10%) value and when its supply is at margin-low (nominal voltage -10%) value. The adjustable voltage supply values can be used to simulate the expected precision of the power supply voltage, drift that can occur due to component aging, ambient temperature changes or fluctuations in supply load current.Ī voltage margining test ensures that the board is functional across the operating range of its onboard and input supplies. This is referred to as supply voltage margining. For example, a circuit board can also be tested for reliable operation over a range of voltage supply values. Once the power supply is adjustable, other benefits can be realized. ![]() Providing a control signal to dynamically and continuously adjust a power supply's output voltage is referred to as closed-loop trimming. The cost effective alternative is to use a separate power supply management IC to adjust the precision of one or more supplies at the same time. More precise power supplies are available, but at a premium price. Modern microprocessors, FPGAs and other complex ICs require accurate power supply voltages, often more accurate, in fact, than the tolerances provided by commodity low-dropout regulators (LDOs) and DC-to-DC power supplies. ![]()
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