Texas Instruments TPS22922B, TPS22921 manual EVM Setup, Recommended Test Equipment

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Chapter 4

SLVU286–January 2009

EVM Setup

4.1Recommended Test Equipment

The following test equipment is recommended:

∙Two-channel storage oscilloscope

∙Current probe

∙Voltage probe

∙3.6 V at 2-A power supply

∙Volt-ohm meter

4.2Calculating Voltage Drop and Load Current

The user should read the applicable data sheet before using the EVM.

Figure 4-1shows the EVM test setup for measuring input and output voltage. The load switch is enabled

into a passive on-board load for this measurement. After measuring the voltages at both VIN and VOUT, the voltage drop across the switch as well as the load current can be calculated from the following equations:

VDROP = VIN – VOUT ILOAD = VOUT / RLOAD

3.6 V, 2 A Max

Oscilloscope

Voltage
probe
+		+
IN	EVM	OUT
–		–

Voltage probe

7” twisted pair, #20 AWG

Figure 4-1. EVM Setup For Calculating Voltage Drop and Load Current

SLVU286–January 2009	EVM Setup	13
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Contents Users Guide Submit Documentation Feedback Contents List of Figures Introduction TPS22921/22/22B Load Switch Evaluation Module EVMSubmit Documentation Feedback Schematic Schematics and Bill of MaterialsEVM Options Bill of Materials Bill of MaterialsTPS22921/22/22B EVM Board Board LayoutTPS22921/22/22B EVM Top-Side Layout Layout Considerations Submit Documentation Feedback Recommended Test Equipment EVM SetupCalculating Voltage Drop and Load Current Submit Documentation Feedback Related Documentation from Texas Instruments Evaluation BOARD/KIT Important Notice Important Notice