參數(shù)資料
型號(hào)： TC1267
廠商： Microchip Technology Inc.
英文描述： UF4006 800V 1A ULTRAFAST DIODE DO-41
中文描述： 400mA的LDO穩(wěn)壓器的PCI
文件頁(yè)數(shù)： 5/14頁(yè)
文件大?。?/td> 490K
代理商： TC1267
2002 Microchip Technology Inc.
DS21378B-page 5
TC1267
4.0
THERMAL CONSIDERATIONS
4.1
Thermal Shutdown
Integrated
regulator off when die temperature exceeds 160°C.
The regulator remains off until the die temperature
drops to approximately 150°C.
thermal
protection
circuitry
shuts
the
4.2
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
).
maximum
allowable
power
dissipation
EQUATION 4-2:
Table 4-1 shows various values of
θ
JA
for the TC1267
packages.
TABLE 4-1:
THERMAL RESISTANCE
GUIDELINES FOR TC1267 IN
5-PIN DDPAK
*Tab of device attached to topside copper.
Equation 4-1
Equation 4-2 to ensure regulator thermal operation is
within limits. For example:
can
be
used
in
conjunction
with
Given:
V
IN
MAX
V
OUT
MIN
I
LOAD
MAX
= 400mA
T
J
MAX
T
A
MAX
θ
JA
= 5V ± 5%
= 3.217V
= 95°C
= 70°C
= 27°C/W (DDPAK mounted on
1000 sq mm topside copper area)
Find: 1. Actual power dissipation
2. Maximum allowable dissipation
Actual power dissipation:
P
D
≈
(V
IN
MAX
– V
OUT
MIN
)I
LOAD
MAX
= (5.25V - 3.217V) 400mA
= 813mW
Maximum allowable power dissipation:
P
D
MAX
= (T
J
MAX
– T
A
MAX
)
θ
JA
= (95 – 70)
27
= 423mW
In this example, the TC1267 dissipates a maximum of
813mW; below the allowable limit of 926mW.
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
2500 sq mm
2500 sq mm
2500 sq mm
2500 sq mm
2500 sq mm
2500 sq mm
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.
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