Setup
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8
SLVUAS6A – March 2017 – Revised January 2018
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Copyright © 2017–2018, Texas Instruments Incorporated
LP2951EVM
Figure 8. EVM With Adjustable Mode Resistors Populated
3.3
Equipment Connection
•
Set power supply to desired input voltage. Verify that the supply is off. Connect positive voltage lead
from supply to the input J5 header. Connect the ground lead from the power supply to GND J4/J8
header.
•
Connect desired loading device from Output J9 header to GND J4/J8 header.
•
Verify that J11 has the Shutdown pin shorted to the pin labeled N.
3.4
Operation
•
Turn on the power supply.
•
Vary respective load and input voltage, as necessary, for test purposes.
4
Thermal Guidelines and Layout Recommendations
Thermal management is a key component in the design of any power converter and is especially
important when the power dissipation in the LDO is high. Use
Equation 2
to approximate the maximum
power dissipation for the particular ambient temperature:
where
•
Where T
J
is the junction temperature, T
A
is the ambient temperature
•
P
D
is the power dissipation in the device (Watts)
•
θ
JA
is the thermal resistance from junction to ambient
(2)
All temperatures are in degrees Celsius. The maximum operating junction temperature, T
J
, must not be
allowed to exceed 125 °C. The layout design must be copper trace. Plane areas smartly, as thermal sinks,
to prevent T
J
to exceed the absolute maximum rating under all temperature conditions and voltage
conditions across the part.
