Texas Instruments Evaluation Module for TPS79501 Single Output LDO TPS79501DRBEVM TPS79501DRBEVM 데이터 시트
제품 코드
TPS79501DRBEVM
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Thermal Guidelines
4
Thermal Guidelines
This section provides guidelines for the thermal management of the TPS7xx01DRBEVM board.
4.1
Thermal Considerations
Thermal management is a key design component of any power converter and is especially important
when the power dissipation in the LDO is high. To better help you design the TPS7xx01DRB family into
your application, the following formula should be used to approximate the maximum power dissipation at a
particular ambient temperature:
when the power dissipation in the LDO is high. To better help you design the TPS7xx01DRB family into
your application, the following formula should be used to approximate the maximum power dissipation at a
particular ambient temperature:
T
J
= T
A
+ P
D
×
q
JA
Where:
T
J
= junction temperature
T
A
= ambient temperature
P
D
= power dissipation in the IC
q
JA
= thermal resistance from junction to ambient
(1)
All temperatures are in degrees Celsius (°C).
The measured thermal resistance from junction to ambient for the TPS7xx01DRBEVM has a typical value
of 32°C/W. The recommended maximum operating junction temperature specified in the product data
sheets for the TPS7xx01 family is +125°C. With these two pieces of information, the maximum power
dissipation can be found by using
of 32°C/W. The recommended maximum operating junction temperature specified in the product data
sheets for the TPS7xx01 family is +125°C. With these two pieces of information, the maximum power
dissipation can be found by using
shows the maximum input voltage that can be applied to the input of the TPS7xx01DRBEVM by
device type and selected output voltage. The maximum input voltage shown provides the rated output
current while keeping the junction temperature at or below the recommended +125°C. Values for two
different ambient temperatures (+25°C and +85°C) are shown.
current while keeping the junction temperature at or below the recommended +125°C. Values for two
different ambient temperatures (+25°C and +85°C) are shown.
Table 3. Maximum Input Voltage versus Ambient Temperature and Output Voltage
Selected Output Voltage (V) for T
A
= +25°C
Selected Output Voltage (V) for T
A
= +85°C
I
OUT
Device
(A)
1.80
2.50
2.80
3.30
1.80
2.50
2.80
3.30
TPS78601DRB
1.50
3.88
4.58
4.88
5.38
2.63
3.33
3.63
4.13
TPS79501DRB
0.50
5.5
(1)
5.5
(1)
5.5
(1)
5.5
(1)
4.30
5.00
5.30
5.5
(1)
TPS79601DRB
1.00
4.93
5.5
(1)
5.5
(1)
5.5
(1)
3.05
3.75
4.05
4.55
(1)
Not limited by thermals; limited by recommended input voltage.
3
SBVU016 – June 2010
TPS78601/TPS79501/TPS79601DRB Evaluation Module
Copyright © 2010, Texas Instruments Incorporated