Texas Instruments TPS22902B Load Switch Evaluation Module TPS22902BEVM TPS22902BEVM 数据表
产品代码
TPS22902BEVM
4.1
Recommended Test Equipment
4.2
Calculating Voltage Drop and Load Current
Oscilloscope
Voltage
probe
probe
3.6 V, 500 mA Max
7” twisted pair, #20 AWG
+
IN
–
+
OUT
–
EVM
Voltage
probe
probe
Chapter 4
SLVU287A – January 2009 – Revised March 2009
EVM Setup
The following test equipment is recommended:
•
Two-channel storage oscilloscope
•
Current probe
•
Voltage probe
•
3.6 V at 500-mA power supply
•
Volt-ohm meter
The user should read the applicable data sheet before using the EVM.
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
SLVU287A – January 2009 – Revised March 2009
EVM Setup
13