參數(shù)資料
型號(hào)： LMK316BJ475KL
廠商： Texas Instruments, Inc.
英文描述： UNREGULATED 60-mA CHARGE PUMP VOLTAGE INVERTER
中文描述： 未穩(wěn)壓60 mA充電泵電壓型逆變器
文件頁(yè)數(shù)： 20/23頁(yè)
文件大?。?/td> 430K
代理商： LMK316BJ475KL
TPS60400, TPS60401, TPS60402, TPS60403
UNREGULATED 60-mA CHARGE PUMP VOLTAGE INVERTER
SLVS324
–
JULY 2001
20
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
OUT
IN
C1
–
TPS60400
C1+
GND
5
4
1
2
3
C(fly)
1
μ
F
5V6
CO
1
μ
F
CI
1
μ
F
VI
GND
VO
–
VI
GND
Figure 36.
power dissipation
As given in the data sheet, the thermal resistance of the unsoldered package is R
θ
JA
= 347
°
C/W. Soldered on
the EVM, a typical thermal resistance of R
θ
JA(EVM)
= 180
°
C/W was measured.
The terminal resistance can be calculated using the following equation:
TJ
PD
Where:
RJA
TA
T
J
is the junction temperature.
T
A
is the ambient temperature.
P
D
is the power that needs to be dissipated by the device.
TJ
PD
RJA
TA
The maximum power dissipation can be calculated using the following equation:
P
D
= V
I
×
I
I
–
V
O
×
I
O
= V
I(max)
×
(I
O
+ I
(SUPPLY)
)
–
V
O
×
I
O
The maximum power dissipation happens with maximum input voltage and maximum output current.
At maximum load the supply current is 0.7 mA maximum.
P
D
= 5 V
×
(60 mA + 0.7 mA)
–
4.4 V
×
60 mA = 40 mW
With this maximum rating and the thermal resistance of the device on the EVM, the maximum temperature rise
above ambient temperature can be calculated using the following equation:
T
J
= R
θ
JA
×
P
D
= 180
°
C/W
×
40 mW =
7.2
°
C
This means that the internal dissipation increases T
J
by
<
10
°
C.
The junction temperature of the device shall not exceed 125
°
C.
This means the IC can easily be used at ambient temperatures up to:
T
A
= T
J(max)
–
T
J
= 125
°
C/W
–
10
°
C = 115
°
C
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