4.1
Recommended Test Equipment
4.2
Calculating Voltage Drop and Load Current
Oscilloscope
Voltage
probe
3.6 V, 2 A Max
7” twisted pair, #20 AWG
+
IN
–
+
OUT
–
EVM
Voltage
probe
Chapter 4
SLVU286 – January 2009
EVM Setup
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
The user should read the applicable data sheet before using the EVM.
Figure 4-1
shows 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 V
IN
and V
OUT
, the
voltage drop across the switch as well as the load current can be calculated from the following equations:
V
DROP
= V
IN
– V
OUT
I
LOAD
= V
OUT
/ R
LOAD
Figure 4-1. EVM Setup For Calculating Voltage Drop and Load Current
SLVU286 – January 2009
EVM Setup
13
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Summary of Contents for TPS22921
Page 1: ...TPS22921 22 22B Load Switch EVM User s Guide Literature Number SLVU286 January 2009...
Page 2: ...2 SLVU286 January 2009 Submit Documentation Feedback...
Page 12: ...Board Layout 12 SLVU286 January 2009 Submit Documentation Feedback...
Page 14: ...EVM Setup 14 SLVU286 January 2009 Submit Documentation Feedback...