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參數(shù)資料
| 型號： | TC2117 |
| 廠商： | Microchip Technology Inc. |
| 英文描述： | D10 - BACKSHELL ENVIRON EMI-RFI 90 DEG M |
| 中文描述： | 800mA的低壓差固定正穩(wěn)壓器 |
| 文件頁數(shù)： | 5/12頁 |
| 文件大?。?/td> | 447K |
| 代理商： | TC2117 |
2002 Microchip Technology Inc.
DS21665B-page 5
TC2117
TABLE 3-2:
THERMAL RESISTANCE
GUIDELINES FOR TC2117 IN
3-PIN DDPAK PACKAGE
Equation 3-1
Equation 3-2 to ensure regulator thermal operation is
within limits. For example:
can
be
used
in
conjunction
with
Find:
1. Actual power dissipation
2. Maximum allowable dissipation
Actual power dissipation:
Maximum allowable power dissipation:
In this example, the TC2117 dissipates a maximum of
only 786mW; below the allowable limit of 1.186mW. In
a similar manner, Equation 3-1 and Equation 3-2 can
be used to calculate maximum current and/or input
voltage limits.
Copper
Area
(Topside)*
Copper
Area
(Backside)
Board Area
Thermal
Resistance
(
θ
JA
)
25°C/W
27°C/W
35°C/W
2500 sq mm
1000 sq mm
125 sq mm
*Tab of device attached to topside copper.
2500 sq mm
2500 sq mm
2500 sq mm
2500 sq mm
2500 sq mm
2500 sq mm
Given:
V
IN
MAX
V
OUT
MIN
I
LOADMAX
T
J
MAX
T
A
MAX
=
=
=
=
=
=
5.0V ± 5%
3.3V ± 0.5%
400mA
125°C
55°C
59°C/W (SOT-223)
θ
JA
P
D
≈
= [(5.0 x 1.05) – (3.3 x .995)] 400 x 10
-3
= 786mW
(V
IN
MAX
– V
OUT
MIN
)I
LOAD
MAX
P
D
MAX
=
(T
J
MAX
– T
A
MAX
)
θ
JA
(125 – 55)
59
=
=
1.186mW
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