參數(shù)資料
型號(hào)： TC563002ECT
廠商： Microchip Technology Inc.
英文描述： 150mA, 10V LDO with Shutdown
中文描述： 150mA的，10V的穩(wěn)壓器，帶有關(guān)斷
文件頁(yè)數(shù)： 4/16頁(yè)
文件大?。?/td> 639K
代理商： TC563002ECT
TC56
DS21436B-page 4
2002 Microchip Technology Inc.
4.0
THERMAL CONSIDERATIONS
4.1
Power Dissipation
The amount of power the regulator dissipates is
primarily a function of input and output voltage, and
output current. The following equation is used to
calculate worst case actual power dissipation.
EQUATION 4-1:
The
(Equation 4-2) is a function of the maximum ambient
temperature (T
A
MAX
), the maximum allowable die
temperature (T
J
MAX
) and the thermal resistance from
junction-to-air (
θ
JA
). The 5-Pin SOT-23A package has
a
θ
JA
of approximately 220
°
C/Watt.
maximum
allowable
power
dissipation
EQUATION 4-2:
Equation 4-1 can be used in conjunction with
Equation 4-2 to ensure regulator thermal operation is
within limits. For example:
Given:
V
IN
MAX
= 3.0V ±10%
V
OUT
MIN
= 2.7V
–
2%
I
LOAD
MAX
= 98mA
T
J
MAX
= 125
°
C
T
A
MAX
= 55
°
C
Find: 1. Actual power dissipation
2. Maximum allowable dissipation
Actual power dissipation:
P
D
≈
(V
IN
MAX
–
V
OUT
MIN
)I
LOAD
MAX
= [(3.0 x 1.1)
–
(2.7 x .98)]98 x 10
-3
= 64mW
Maximum allowable power dissipation:
P
D
MAX
= (T
J
MAX
–
T
A
MAX
)
In this example, the TC56 dissipates a maximum of
64mW; below the allowable limit of 318mW. In a similar
manner, Equation 4-1 and Equation 4-2 can be used to
calculate maximum current and/or input voltage limits.
4.2
Layout Considerations
The primary path of heat conduction out of the package
is via the package leads. Therefore, layouts having a
ground plane, wide traces at the pads, and wide power
supply bus lines combine to lower
θ
JA
and therefore,
increase the maximum allowable power dissipation
limit.
Where:
P
D
≈
(V
IN
MAX
–
V
OUT
MIN
)I
LOAD
MAX
P
D
V
IN
MAX
V
OUT
MIN
I
LOAD
MAX
= Worst case actual power dissipation
= Maximum voltage on V
IN
= Minimum regulator output voltage
= Maximum output (load) current
P
D
MAX
= (T
J
MAX
–
T
A
MAX
)
θ
JA
Where all terms are previously defined.
θ
JA
= (125
–
55)
220
= 318mW
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