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TC1265-1.8VOA bảng dữ liệu(PDF) 8 Page - Microchip Technology

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TC1265
DS21376D-page 8
© 2006 Microchip Technology Inc.
5.0
THERMAL CONSIDERATIONS
5.1
Thermal Shutdown
Integrated thermal protection circuitry shuts the
regulator off when die temperature exceeds 160°C.
The regulator remains off until the die temperature
drops to approximately 150°C.
5.2
Power Dissipation
The amount of power the regulator dissipates is
primarily a function of input voltage, output voltage and
output current. The following equation is used to
calculate worst-case actual power dissipation:
EQUATION 5-1:
The
maximum
allowable
power
dissipation
(Equation 5-2) is a function of the maximum ambient
temperature (TAMAX), the maximum allowable die
temperature (TJMAX) and the thermal resistance from
junction-to-air (
θJA).
EQUATION 5-2:
Table 5-1 and Table 5-2 show various values of
θJA for
the TC1265 package types.
TABLE 5-1:
THERMAL RESISTANCE
GUIDELINES FOR TC1265 IN
8-PIN SOIC PACKAGE
TABLE 5-2:
THERMAL RESISTANCE
GUIDELINES FOR TC1265 IN
5-PIN DDPAK/TO-220
PACKAGE
Equation 5-1 can be used in conjunction with
Equation 5-2 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 TC1265 dissipates a maximum of
260 mW, below the allowable limit of 500 mW. In a
similar manner, Equation 5-1 and Equation 5-2 can be
used to calculate maximum current and/or input
voltage limits. For example, the maximum allowable
VIN is found by substituting the maximum allowable
power dissipation of 500 mW into Equation 5-1, from
which VINMAX = 4.6V.
Copper
Area
(Topside)*
Copper
Area
(Backside)
Board
Area
Thermal
Resistance
JA)
2500 sq mm
2500 sq mm
2500 sq mm
60°C/W
1000 sq mm
2500 sq mm
2500 sq mm
60°C/W
225 sq mm
2500 sq mm
2500 sq mm
68°C/W
100 sq mm
2500 sq mm
2500 sq mm
74°C/W
* Pin 2 is ground. Device is mounted on the top-side.
Where:
VINMAX
VOUTMIN
ILOADMAX
PD = Worst-case actual power dissipation
= Minimum regulator output voltage
= Maximum output (load) current
= Maximum voltage on VIN
PD
VINMAX VOUTMIN
()I
LOADMAX
=
Where:
VINMAX
VOUTMIN
ILOADMAX
PD = Worst-case actual power dissipation
= Minimum regulator output voltage
= Maximum output (load) current
= Maximum voltage on VIN
PDMAX
TJMAX TAMAX
θ
JA
---------------------------------------
=
Copper
Area
(Topside)*
Copper
Area
(Backside)
Board
Area
Thermal
Resistance
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 top-side copper
Given:
VINMAX =3.3V ± 10%
VOUTMIN = 2.7V ± 0.5%
ILOADMAX =275 mA
TJMAX = 125°C
TAMAX =95°C
θJA = 60°C/W (SOIC)
PD
VINMAX VOUTMIN
()I
LOADMAX
PD
3.3 1.1
×
()
2.7 .995
×
()
275 10
3
×
=
PD
260 mW
=
PDMAX
TJMAX TAMAX
θ
JA
---------------------------------------
=
PDMAX
125 95
()
60
-------------------------
=
PDMAX
500 mW
=


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