參數(shù)資料
型號(hào)： TPS2058D
廠商： Texas Instruments, Inc.
英文描述： QUAD CURRENT-LIMITED POWER-DISTRIBUTION SWITCHES
中文描述： 四限流配電開(kāi)關(guān)
文件頁(yè)數(shù)： 17/24頁(yè)
文件大?。?/td> 424K
代理商： TPS2058D
TPS2048, TPS2058
QUAD CURRENT-LIMITED POWER-DISTRIBUTION SWITCHES
SLVS192 – APRIL 1999
17
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
GND1
IN1
EN1
EN2
OC1
OC2
OUT1
OUT2
TPS2048
GND1
IN1
EN1
EN2
OC1
OC2
OUT1
OUT2
TPS2048
Rpullup
V+
Rfilter
Rpullup
Cfilter
To USB
Controller
V+
OC3
OC4
OUT3
OUT4
GND2
IN2
EN3
EN4
GND2
IN2
EN3
EN4
OC3
OC4
OUT3
OUT4
Figure 30. Typical Circuit for OC Pin and RC Filter for Damping Inrush OC Responses
power dissipation and junction temperature
The low on-resistance on the n-channel MOSFET allows small surface-mount packages, such as SOIC, to pass
large currents. The thermal resistances of these packages are high compared to those of power packages; it
is good design practice to check power dissipation and junction temperature. The first step is to find r
DS(on)
at
the input voltage and operating temperature. As an initial estimate, use the highest operating ambient
temperature of interest and read r
DS(on)
from Figure 21. Next, calculate the power dissipation using:
I2
PD
rDS(on)
Finally, calculate the junction temperature:
TJ
PD
RJA
TA
Where:
T
A
= Ambient Temperature
°
C
R
θ
JA
= Thermal resistance SOIC = 172
°
C/W
Compare the calculated junction temperature with the initial estimate. If they do not agree within a few degrees,
repeat the calculation, using the calculated value as the new estimate. Two or three iterations are generally
sufficient to get a reasonable answer.
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