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TC1266VUA датащи(PDF) 5 Page - Microchip Technology

номер детали TC1266VUA
подробное описание детали  200mA PCI LDO
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производитель  MICROCHIP [Microchip Technology]
домашняя страница  http://www.microchip.com
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TC1266VUA датащи(HTML) 5 Page - Microchip Technology

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© 2002 Microchip Technology Inc.
DS21377B-page 5
TC1266
4.0
THERMAL CONSIDERATIONS
4.1
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.
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
maximum
allowable
power
dissipation
(Equation 4-2) 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 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:
VINMAX
=5V± 5%
VOUTMIN =3.217V
ILOADMAX = 200mA
TJMAX
= 125°C
TAMAX
=70°C
θJA
= 130°C/W (SOIC)
Find: 1. Actual power dissipation
2. Maximum allowable dissipation
Actual power dissipation:
PD ≈ (VINMAX –VOUTMIN)ILOADMAX
= (5.25V - 3.217V) 200mA
= 407mW
Maximum allowable power dissipation:
In this example, the TC1266 dissipates a maximum of
407mW; below the allowable limit of 423mW.
Where:
PD ≈ (VINMAX –VOUTMIN)ILOADMAX
PD
VINMAX
VOUTMIN
ILOADMAX
= Worst case actual power dissipation
= Minimum regulator output voltage
= Maximum output (load) current
= Maximum voltage on VIN
PDMAX =(TJMAX –TAMAX)
θJA
Where all terms are previously defined.
PDMAX =(TJMAX –TAMAX)
θJA
= (125 – 70)
130
= 423mW


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