參數(shù)資料
型號(hào)： TPS2022P
廠商： Texas Instruments, Inc.
英文描述： POWER-DISTRIBUTION SWITCHES
中文描述： 配電開(kāi)關(guān)
文件頁(yè)數(shù)： 19/23頁(yè)
文件大?。?/td> 377K
代理商： TPS2022P
TPS2020, TPS2021, TPS2022, TPS2023, TPS2024
POWER-DISTRIBUTION SWITCHES
SLVS175A – DECEMBER 1998 – REVISED NOVEMBER 1999
19
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
GND
IN
IN
EN
OUT
OC
OUT
OUT
TPS202x
GND
IN
IN
EN
OUT
OC
OUT
OUT
TPS202x
Rpullup
V+
Rfilter
Rpullup
Cfilter
V+
Figure 39. 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 Figures 33–36. 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, PDIP = 106
°
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 an acceptable answer.
thermal protection
Thermal protection prevents damage to the IC when heavy-overload or short-circuit faults are present for
extended periods of time. The faults force the TPS202x into constant current mode, which causes the voltage
across the high-side switch to increase; under short-circuit conditions, the voltage across the switch is equal
to the input voltage. The increased dissipation causes the junction temperature to rise to high levels. The
protection circuit senses the junction temperature of the switch and shuts it off. Hysteresis is built into the thermal
sense circuit, and after the device has cooled approximately 20 degrees, the switch turns back on. The switch
continues to cycle in this manner until the load fault or input power is removed.
undervoltage lockout (UVLO)
An undervoltage lockout ensures that the power switch is in the off state at powerup. Whenever the input voltage
falls below approximately 2 V, the power switch will be quickly turned off. This facilitates the design of
hot-insertion systems where it is not possible to turn off the power switch before input power is removed. The
UVLO will also keep the switch from being turned on until the power supply has reached at least 2 V, even if
the switch is enabled. Upon reinsertion, the power switch will be turned on, with a controlled rise time to reduce
EMI and voltage overshoots.
相關(guān)PDF資料
PDF描述
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