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TDA8133D 数据表(PDF) 9 Page - STMicroelectronics

部件名 TDA8133D
功能描述  5.1 V AND 8 V DUAL-VOLTAGE REGULATOR WITH DISABLE AND RESET FUNCTIONS
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制造商  STMICROELECTRONICS [STMicroelectronics]
网页  http://www.st.com
标志 STMICROELECTRONICS - STMicroelectronics

TDA8133D 数据表(HTML) 9 Page - STMicroelectronics

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TDA8133/D
POWER DISSIPATION AND LAYOUT INDICATIONS
5
POWER DISSIPATION AND LAYOUT INDICATIONS
The power is mainly dissipated by the two device buffers. It can be calculated by the equation:
P = (VIN1-VO1) x IO1 + (VIN2-VO2) x IO2
The following table lists the different RthJA values of these packages with or without a heat sink and
the corresponding maximum power dissipation assuming:
q
Maximum Ambient Temperature = 70° C
q
Maximum Junction Temperature = 140° C
Device
Heat Sink
RthJA in °C/W
PMAX in W
TDA8133
No
50
1.4
Yes
20
3.5
TDA8133D
No
56 to 40
1.25 to 1.75
Yes
32
2.2
Figure 7: Thermal Resistance (Junction-to-Ambient) of DIP16 Package without Heat Sink
Figure 8: Metal plate mounted near the TDA8133D for heat sinking
Copper area (cm²) (35 µm plus solder) Board is face-down
To optimize the thermal conductivity of the copper
layer and the exchanges with the air, the solder
must cover the maximum amount of this area.
60
40
50
10
12
0
55
45
24
8
6
Test Board with
“On Board” square heat sink area.
Top View
Bottom View


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