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| 型號： | PTD08D210WACT |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 電源模塊 |
| 英文描述： | 1-OUTPUT DC-DC REG PWR SUPPLY MODULE |
| 封裝： | ROHS COMPLIANT, PLASTIC, DIP-22 |
| 文件頁數(shù)： | 19/19頁 |
| 文件大?。?/td> | 480K |
| 代理商： | PTD08D210WACT |
0
2
4
6
8
10
1.0
0
1.5
0.5
2.5
3.0
2.0
V
I
= 12 V
fSW = 750 kHz
V
O
= 2.5 V
V
O
= 1.8 V
V
O
= 3.3 V
V
O
= 1.2 V
P
D
–
P
o
w
e
r
D
is
s
ip
a
ti
o
n
–
W
I
O
– Output Current – A
V
O
= 0.8 V
40
20
60
30
80
90
70
50
200 LFM
V
I
= 12 V
fSW = 750 kHz
T
A
–
A
m
b
ie
n
t
T
e
m
p
e
r
a
tu
r
e
–
°
C
0
1
2
3
4
5
P
D(VOA)
+P
D(VOB)
P
D
– Total Power Dissipation – W
3.5
400 LFM
Natural Convection
100 LFM
www.ti.com
SLTS295B – DECEMBER 2009 – REVISED DECEMBER 2010
APPLICATION INFORMATION
Determining the Safe Operating Area
The Safe Operating Area (SOA) curves for the
PTD08D210W are determined by the total power
dissipation of the module, the maximum ambient
temperature, and the minimum available airflow of the
application. Operation below the application airflow
curve is considered a thermally safe design. For a
given SOA, refer to the Power Dissipation curves for
the same input voltage and switching frequency to
determine each output's power dissipation. Add the
power dissipation of VOA and VOB to get the total power
dissipation. The total power dissipation can then be
used to determine the safe operating area for the
application.
For example, consider an application operating from a
12-V input and a 750-kHz switching frequency,
requiring 1.2 V @ 10 A and 3.3 V @ 6 A outputs. In
order to determine the safe operating area the power
dissipation for each of the outputs must first be
determined. Using the VI = 12 V, fSW = 750 kHz Power
Dissipation graph, the power dissipation for the 1.2 V
@ 10 A output is 2 W and the power dissipation for the
3.3 V @ 6 A output is 1.5 W. Adding the power
dissipation for both outputs results in a total power
dissipation of 3.5 W. The safe operating area can then
be determined using the VI = 12V, fSW = 750 kHz SOA
graph, the amount of airflow of the application and the
3.5-W total power dissipation. At 3.5 W and 400 LFM,
the application can operate up to 85°C, but when no
airflow is available the maximum ambient temperature
is limited to less than 71°C.
NOTE
Graphs above have been replicated from the Typical Characteristics section for this example
The maximum output current for either output must not exceed 10 A.
Copyright 2009–2010, Texas Instruments Incorporated
9
Product Folder Link(s): PTD08D210W
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