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參數(shù)資料
| 型號： | TC2117-3.3EB |
| 廠商： | Microchip Technology Inc. |
| 英文描述： | 800 mA Fixed Low Dropout Positive Regulator |
| 中文描述： | 800毫安固定低壓差穩(wěn)壓器正 |
| 文件頁數(shù)： | 8/18頁 |
| 文件大?。?/td> | 751K |
| 代理商： | TC2117-3.3EB |
TC2117
DS21665C-page 8
2006 Microchip Technology Inc.
TABLE 4-2:
THERMAL RESISTANCE
GUIDELINES FOR TC2117 IN
3-PIN DDPAK PACKAGE
Equation 4-1
can be used in conjunction with
Equation 4-2
to ensure regulator thermal operation is
within limits. For example:
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 786 mW; below the allowable limit of 1.186W. In a
similar manner,
Equation 4-1
and
Equation 4-2
can be
used to calculate maximum current and/or input volt-
age limits.
Copper
Area
(Topside)*
Copper
Area
(Backside)
Board Area
Thermal
Resistance
(
θ
JA
)
2500 sq mm
2500 sq mm
2500 sq mm
25°C/W
1000 sq mm
2500 sq mm
2500 sq mm
27°C/W
125 sq mm
2500 sq mm
2500 sq mm
35°C/W
*Tab of device attached to topside copper.
Given:
V
IN
MAX
V
OUT
MIN
I
LOADMAX
T
J
MAX
T
A
MAX
= 5.0V ± 5%
= 3.3V ± 0.5%
= 400 mA
= 125°C
= 55°C
= 59°C/W (SOT-223)
θ
JA
P
D
≈
(V
IN
MAX
– V
OUT
MIN
)I
LOAD
MAX
= [(5.0 x 1.05) – (3.3 x .995)] 400 x 10
-3
= 786 mW
P
D
MAX
=
(T
J
MAX
– T
A
MAX
)
θ
JA
=
(125 – 55)
59
=
1.186W
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