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参数资料
| 型号： | TPS2053DR |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 电源管理 |
| 英文描述： | 3-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO16 |
| 封装： | GREEN, PLASTIC, SOIC-16 |
| 文件页数： | 9/28页 |
| 文件大小： | 601K |
| 代理商： | TPS2053DR |
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TPS2043, TPS2053
TRIPLE POWER-DISTRIBUTION SWITCHES
SLVS191 – JANUARY 1999
17
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
OC response (continued)
GND1
IN1
EN1
EN2
OC1
OC2
OUT1
OUT2
TPS2043
GND1
IN1
EN1
EN2
OC1
OC2
OUT1
OUT2
TPS2043
Rpullup
V+
Rfilter
Rpullup
Cfilter
To USB
Controller
V+
OC3
NC
OUT3
NC
GND2
IN2
EN3
NC
GND2
IN2
EN3
NC
OC3
NC
OUT3
NC
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 rDS(on) at
the input voltage and operating temperature. As an initial estimate, use the highest operating ambient
temperature of interest and read rDS(on) from Figure 21. Next, calculate the power dissipation using:
P
D +
r
DS(on)
I2
Finally, calculate the junction temperature:
T
J +
P
D
RqJA ) TA
Where:
TA = Ambient Temperature °C
RθJA = 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 an acceptable answer.
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| TPS2054AD | 功能描述:电源开关 IC - USB Qd .345A 2.7-5.5V Hi RoHS:否 制造商:Micrel 电源电压-最小:2.7 V 电源电压-最大:5.5 V 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:SOIC-8 封装:Tube |
| TPS2054ADG4 | 功能描述:电源开关 IC - USB Qd .345A 2.7-5.5V Hi RoHS:否 制造商:Micrel 电源电压-最小:2.7 V 电源电压-最大:5.5 V 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:SOIC-8 封装:Tube |
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