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ADP1714-3.3-EVALZ Datasheet(PDF) 7 Page - Analog Devices |
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ADP1714-3.3-EVALZ Datasheet(HTML) 7 Page - Analog Devices |
7 / 8 page EVAL-ADP1712/ADP1713/ADP1714 Rev. 0 | Page 7 of 8 GROUND CURRENT MEASUREMENTS GND GND GND GND C1 C2 U1 C3 R1 R2 VIN VOUT EN J1 EVAL-ADP1712/ ADP1713/ADP1714 SS/ADJ/BYP/TRK + _ VOLTAGE SOURCE AMMETER LOAD _ + μA Figure 11. Ground Current Measurement Figure 11 shows how the evaluation board can be connected to a voltage source and an ammeter for ground current measure- ments. A resistor can be used as the load for the regulator. Ensure that the resistor has a power rating adequate to handle the power expected to be dissipated across it. An electronic load can be used as an alternative. Ensure that the voltage source used can supply enough current for the expected load levels. Follow these steps to connect to a voltage source and ammeter: 1. Connect the positive terminal (+) of the voltage source to the VIN pad on the evaluation board. 2. Connect the positive terminal (+) of the ammeter to one of the GND pads of the evaluation board. 3. Connect the negative terminal (−) of the ammeter to the negative (−) terminal of the voltage source. 4. Connect a load between the VOUT pad of the evaluation board and the negative (−) terminal of the voltage source. 5. The voltage source can now be turned on. If J1 is inserted (this connects EN to VIN for automatic startup), then the regulator powers up. GROUND CURRENT CONSUMPTION Ground current measurements are a way of determining how much current the regulator’s internal circuits are consuming while performing the regulation function. To be efficient, the regulator needs to consume as little current as possible. Typically, the regulator uses the maximum current when supplying its largest load level (300 mA). Figure 12 shows the typical ground current consumption for various load levels. 400 0 0.1 1000 ILOAD (mA) 1 10 100 350 300 250 200 150 100 50 Figure 12. Ground Current vs. Load Current When the device is disabled (EN = GND), ground current drops to less than 1 μA. Note: Larger ground current levels occur when using an evaluation board with R1 and R2 present. |
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