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ADP7183-EVALZ Datasheet(PDF) 6 Page - Analog Devices |
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ADP7183-EVALZ Datasheet(HTML) 6 Page - Analog Devices |
6 / 9 page UG-795 ADP7183-EVALZ User Guide Rev. 0 | Page 6 of 9 – + VOLTAGE SOURCE LOAD –+ AMMETER –0.00355 A Figure 7. Ground Current Measurement Setup GROUND CURRENT MEASUREMENTS Figure 7 shows how to connect the ADP7183 evaluation board to a voltage source and an ammeter for ground current measurements. Use a resistor as the load for the regulator. Ensure that the resistor has a power rating that is adequate to handle the power expected to dissipate across it. As an alternative, use an electronic load. Ensure that the voltage source can supply enough current for the expected load levels. Follow these steps to connect the evaluation board to a voltage source and ammeter: 1. Connect the negative terminal (−) of the voltage source to the VIN pad on the evaluation board. 2. Connect the negative terminal (−) of the ammeter to one of the GND pads of the evaluation board. 3. Connect the positive terminal (+) of the ammeter to the positive terminal (+) of the voltage source. 4. Connect a load between the positive terminal (+) of the voltage source and the VOUT pad of the evaluation board. When these connection steps are completed, turn on the voltage source. If J1 is inserted (connecting EN to VIN for automatic startup), the regulator powers up. Ground Current Consumption Ground current measurements can determine how much current the internal circuits of the regulators consume while the circuits perform the regulation function. To be efficient, the regulators must consume as little current as possible. Typically, the regulators use the maximum current when supplying their largest load level (−300 mA for the ADP7183). Figure 8 shows the typical ground current consumption for the various load levels at VOUT = −3.3 V and TA = 25°C. When the device is disabled (EN = GND), the ground current drops to less than 1 μA. ILOAD (mA) –3.5 –4.0 –3.0 –2.5 –2.0 –1.5 –1.0 –0.5 0 –300 –200 –100 0 Figure 8. Ground Current vs. Load Current (ILOAD), VOUT = −3.3 V, TA = 25°C |
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