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ST72774 bảng dữ liệu(PDF) 133 Page - STMicroelectronics

tên linh kiện ST72774
Giải thích chi tiết về linh kiện  8-BIT USB MCU FOR MONITORS, WITH UP TO 60K OTP, 1K RAM, ADC, TIMER, SYNC, TMU, PWM/BRM, H/W DDC & I2C
PDF  144 Pages
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nhà sản xuất  STMICROELECTRONICS [STMicroelectronics]
Trang chủ  http://www.st.com
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ST72774 bảng dữ liệu(HTML) 133 Page - STMicroelectronics

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6.1 POWER CONSIDERATIONS
The average chip-junction temperature, TJ, in
degrees Celsius, may be calculated using the
following equation:
TJ = TA + (PD x θJA) (1)
Where:
– TA is the Ambient Temperature in °C,
–
θJ
A is the Package Junction-to-Ambient Thermal
Resistance, in
°C/W,
– PD is the sum of PINT and PI/O,
– PINT is the product of IDD and VDD, expressed in
Watts. This is the Chip Internal Power
– PI/O represents the Power Dissipation on Input
and Output Pins; User Determined.
For most applications PI/O<PINT and may be
neglected. PI/O may be significant if the device is
configured to drive Darlington bases or sink LED
Loads.
An approximate relationship between PD and TJ
(if PI/O is neglected) is given by:
PD = K÷ (TJ + 273°C) (2)
Therefore:
K = PD x (TA + 273°C) + θJA x PD
2 (3)
Where:
– K is a constant for the particular part, which may
be determined from equation (3) by measuring
PD (at equilibrium) for a known TA. Using this
value of K, the values of PD and TJ may be ob-
tained by solving equations (1) and (2) iteratively
for any value of TA.
Table 34. Thermal Characteristics
Symbol
Package
Value
Unit
θJ
A
PSDIP42
95
°C/W
θJ
A
TQFP44
95
°C/W



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