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參數(shù)資料
| 型號： | TPS2096DR |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | QUAD POWER-DISTRIBUTION SWITCHES |
| 中文描述： | 四配電開關(guān) |
| 文件頁數(shù)： | 15/19頁 |
| 文件大?。?/td> | 314K |
| 代理商： | TPS2096DR |
TPS2090, TPS2091, TPS2092 DUAL,
TPS2095, TPS2096, TPS2097 QUAD
POWER-DISTRIBUTION SWITCHES
SLVS245A
–
SEPTEMBER 2000
–
REVISED MARCH 2001
15
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
OC response (continued)
GND
IN1
IN2
EN1
OC
EN2
OUT1
OUT2
TPS2092
Rpullup
V+
Figure 25. Typical Circuit for OC Pin
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 that of power packages; it is
good design practice to check power dissipation and junction temperature. Begin by determining the r
DS(on)
of
the N-channel MOSFET relative to 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 18. Using this value, the power
dissipation per switch can be calculated by:
PD
rDS
(
on
)
I
2
Multiply this number by the total number of switches being used, to get the total power dissipation coming from
the N-channel MOSFETs.
Finally, calculate the junction temperature:
TJ
PD
RJA
TA
Where:
T
A
= Ambient Temperature
°
C
R
θ
JA
= Thermal resistance SOIC = 172
°
C/W (for 8 pin), 111
°
C/W (for 16 pin)
P
D
= Total power dissipation based on number of switches being used.
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.
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 TPS209x 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.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TPS2096DRG4 | 功能描述:電源開關(guān) IC - 配電 0.3A 2.7-5.5V Quad Hi-Side MOSFET RoHS:否 制造商:Exar 輸出端數(shù)量:1 開啟電阻（最大值）:85 mOhms 開啟時間（最大值）:400 us 關(guān)閉時間（最大值）:20 us 工作電源電壓:3.2 V to 6.5 V 電源電流（最大值）: 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOT-23-5 |
| TPS2097D | 功能描述:電源開關(guān) IC - 配電 0.3A 2.7-5.5V Quad Hi-Side MOSFET RoHS:否 制造商:Exar 輸出端數(shù)量:1 開啟電阻（最大值）:85 mOhms 開啟時間（最大值）:400 us 關(guān)閉時間（最大值）:20 us 工作電源電壓:3.2 V to 6.5 V 電源電流（最大值）: 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOT-23-5 |
| TPS2097DG4 | 功能描述:電源開關(guān) IC - 配電 0.3A 2.7-5.5V Quad Hi-Side MOSFET RoHS:否 制造商:Exar 輸出端數(shù)量:1 開啟電阻（最大值）:85 mOhms 開啟時間（最大值）:400 us 關(guān)閉時間（最大值）:20 us 工作電源電壓:3.2 V to 6.5 V 電源電流（最大值）: 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOT-23-5 |
| TPS2097DR | 功能描述:電源開關(guān) IC - 配電 0.3A 2.7-5.5V Quad Hi-Side MOSFET RoHS:否 制造商:Exar 輸出端數(shù)量:1 開啟電阻（最大值）:85 mOhms 開啟時間（最大值）:400 us 關(guān)閉時間（最大值）:20 us 工作電源電壓:3.2 V to 6.5 V 電源電流（最大值）: 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOT-23-5 |
| TPS2097DRG4 | 功能描述:電源開關(guān) IC - 配電 0.3A 2.7-5.5V Quad Hi-Side MOSFET RoHS:否 制造商:Exar 輸出端數(shù)量:1 開啟電阻（最大值）:85 mOhms 開啟時間（最大值）:400 us 關(guān)閉時間（最大值）:20 us 工作電源電壓:3.2 V to 6.5 V 電源電流（最大值）: 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOT-23-5 |
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