參數(shù)資料
型號: L9805
廠商: 意法半導(dǎo)體
元件分類: 基準(zhǔn)電壓源/電流源
英文描述: Super Smart Power Motor Driver with 8-BIT MCU, CAN Interface, 16K EPROM, 256Bytes RAM, 128 Bytes EEPROM, 10 Bit ADC, WDG, 2 Timers, 2 PWM Modules, Ful
中文描述: 超級智能型電動馬達(dá)驅(qū)動器,帶有8位微控制器,CAN接口,16K的存儲器,256Bytes RAM內(nèi)存,128字節(jié)EEPROM,10位ADC,水分散粒劑,2定時器,2個PWM模塊,涪陵
文件頁數(shù): 94/103頁
文件大?。?/td> 853K
代理商: L9805
94/103
L9805
7.2 POWER CONSIDERATIONS
The average chip-junction temperature, T
J
, in de-
grees Celsius, may be calculated using the follow-
ing equation:
T
J
= T
A
+ (P
D
x
θ
JA
) (1)*
Where:
– T
A
is the Ambient Temperature in
°
C,
θ
JA
is the Package Junction-to-Ambient Thermal
Resistance, in
°
C/W,
– P
D
is the sum of P
INT
and P
I/O
,
– P
INT
is the product of I
1
and
VB, plus the
power
dissipated by the power bridge, expressed in
Watts. This is the Chip Internal Power
– P
I/O
represents the Power Dissipation on Input
and Output Pins; User Determined.
For most applications P
I/O
<<P
INT
and may be ne-
glected. P
I/O
may be significant if the device is con-
figured to drive Darlington bases or sink LED Loads.
An approximate relationship between P
D
and T
J
(if P
I/O
is neglected) is given by:
P
D
= K
÷
(T
J
+ 273°C) (2)
Therefore:
K = P
D
x (T
A
+ 273°C) +
θ
JA
x P
D2
(3)
Where:
– K is a constant for the particular part, which may
be determined from equation (3) by measuring
P
D
(at equilibrium) for a known T
A.
Using this val-
ue of K, the values of P
D
and T
J
may be obtained
by solving equations (1) and (2) iteratively for any
value of T
A
.
Table 15. Thermal Characteristics (VB=18V, T
J
= 150°C, I
LOAD
= 2A)
(*):
Maximum chip dissipation can directly be obtained from T
j
(max),
θ
JA
and T
A
parameters.
Symbol
Description
Value
Unit
P
D
Dissipated Power
3
W
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