參數(shù)資料
型號(hào)： TPS2202AI
廠商： Texas Instruments, Inc.
英文描述： DUAL-SLOT PC CARD POWER-INTERFACE SWITCH WITH RESET FOR SERIAL PCMCIA CONTROLLER
中文描述： 雙插槽PC卡電源，串行接口，PCMCIA控制器復(fù)位開關(guān)
文件頁(yè)數(shù)： 17/21頁(yè)
文件大?。?/td> 455K
代理商： TPS2202AI
TPS2202, TPS2202Y
DUAL-SLOT PC CARD POWER-INTERFACE SWITCHES
FOR SERIAL PCMCIA CONTROLLERS
SLVS103A – DECEMBER 1994 – REVISED AUGUST 1995
6–17
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
overcurrent and thermal protection
The TPS2202 uses sense FETs to check for overcurrent conditions in each of the V
CC
and V
pp
outputs. Unlike
sense resistors or polyfuses, these FETs do not add to the series resistance of the switch; therefore, voltage
and power losses are reduced. Overcurrent sensing is applied to each output separately. When an overcurrent
condition is detected, only the power output affected is limited; all other power outputs continue to function
normally. The OC indicator, normally a logic high, is a logic low when any overcurrent condition is detected,
providing for initiation of system diagnostics and/or sending a warning message to the user.
During power up, the TPS2202 controls the rise time of the V
CC
and V
pp
outputs and limits the current into a
faulty card or connector. If a short circuit is applied after power is established (e.g., hot insertion of a bad card),
current is initially limited only by the impedance between the short and the power supply. In extreme cases, as
much as 10 A to 15 A may flow into the short before the current limiting of the TPS2202 engages. If the V
CC
or V
pp
outputs are driven below ground, the TPS2202 may latch nondestructively in an off state. Cycling power
reestablishes normal operation.
Overcurrent limiting for the V
CC
outputs is designed to engage if powered up into a short in the range of
0.75 A to 1.9 A, typically at about 1.3 A; the V
pp
outputs limit from 120 mA to 400 mA, typically around 200 mA.
The protection circuitry acts by linearly limiting the current passing through the switch, rather than initiating a
full shutdown of the supply. Shutdown occurs only during thermal limiting.
Thermal limiting prevents destruction of the IC from overheating when the package power-dissipation ratings
are exceeded. Thermal limiting, disables all power outputs (both A and B slots) until the device has cooled.
calculating junction temperature
The switch resistance, r
DS(on)
, is dependent on the junction temperature, T
J
, of the die. The junction temperature
is dependent on both r
DS(on)
and the current through the switch. To calculate T
J
, first find r
DS(on)
from Figures
16, 17, and 18 using an initial temperature estimate about 50
°
C above ambient. Then calculate the power
dissipation for each switch, using the formula:
I2
PD
rDS(on)
Next, sum the power dissipation and calculate the junction temperature:
TJ
PD
RJA
TA, RJA
108 C W
Compare the calculated junction temperature with the initial temperature estimate. If they are not within a few
degrees of each other, reiterate using the calculated temperature as the initial estimate.
logic input and outputs
The serial interface consists of DATA, CLOCK, and LATCH leads. The data is clocked in on the positive leading
edge of the clock (see Figure 2). The 9-bit (D0 through D8) serial data word is loaded during the positive edge
of the latch signal. The latch signal should occur before the next positive leading edge of the clock.
The shutdown bit of the data word places all V
CC
and V
pp
outputs in a high-impedance state and reduces chip
quiescent current to 1
μ
A to conserve battery power.
The TPS2202 serial interface is designed to be compatible with serial-interface PCMCIA controllers and current
PCMCIA and JEIDA standards.
An overcurrent output (OC) is provided to indicate an overcurrent condition in any of the V
CC
or V
pp
outputs,
as previously discussed.
相關(guān)PDF資料
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
TPS2202AIDB 功能描述:熱插拔功率分布 1A Dual-Slot PC Card Pwr Sw RoHS:否 制造商:Texas Instruments 產(chǎn)品:Controllers & Switches 電流限制: 電源電壓-最大:7 V 電源電壓-最小:- 0.3 V 工作溫度范圍: 功率耗散: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Tube
TPS2202AIDBG4 功能描述:熱插拔功率分布 1A Dual-Slot PC Card Pwr Sw RoHS:否 制造商:Texas Instruments 產(chǎn)品:Controllers & Switches 電流限制: 電源電壓-最大:7 V 電源電壓-最小:- 0.3 V 工作溫度范圍: 功率耗散: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Tube
TPS2202AIDBLE 制造商:Rochester Electronics LLC 功能描述:- Bulk
TPS2202AIDBR 功能描述:熱插拔功率分布 1A Dual-Slot PC Card w/Serial Interface RoHS:否 制造商:Texas Instruments 產(chǎn)品:Controllers & Switches 電流限制: 電源電壓-最大:7 V 電源電壓-最小:- 0.3 V 工作溫度范圍: 功率耗散: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Tube
TPS2202AIDBRG4 功能描述:熱插拔功率分布 1A Dual-Slot PC Card w/Serial Interface RoHS:否 制造商:Texas Instruments 產(chǎn)品:Controllers & Switches 電流限制: 電源電壓-最大:7 V 電源電壓-最小:- 0.3 V 工作溫度范圍: 功率耗散: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Tube
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