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参数资料
| 型号： | TPS2216DAPR |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 电源管理 |
| 英文描述： | 3-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO32 |
| 封装： | GREEN, PLASTIC, HTSSOP-32 |
| 文件页数： | 11/29页 |
| 文件大小： | 549K |
| 代理商： | TPS2216DAPR |
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TPS2216
DUALSLOT PC CARD POWERINTERFACE SWITCH
FOR SERIAL PCMCIA CONTROLLERS
SLVS179D MARCH 1999 REVISED JUNE 2000
19
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
designing for voltage regulation
The current PCMCIA specification for output voltage regulation, VO(reg), of the 5-V output is 5% (250 mV). In
a typical PC power-system design, the power supply has an output-voltage regulation, VPS(reg), of 2% (100 mV).
Also, a voltage drop from the power supply to the PC Card will result from resistive losses, VPCB, in the PCB
traces and the PCMCIA connector. A typical design would limit the total of these resistive losses to less than
1% (50 mV) of the output voltage. Therefore, the allowable voltage drop, VDS, for the TPS2216 would be the
PCMCIA voltage regulation less the power supply regulation and less the PCB and connector resistive drops:
V
DS +
V
O(reg)
–V
PS(reg)
–V
PCB
Typically, this would leave 100 mV for the allowable voltage drop across the 5-V switch. The specification for
output voltage regulation of the 3.3-V output is 300 mV; so, using the same equation by deducting the voltage
drop percentages (2%) for power-supply regulation and PCB resistive loss (1%), the allowable voltage drop for
the 3.3-V switch is 200 mV. The voltage drop is the output current multiplied by the switch resistance of the
TPS2216. Therefore, the maximum output current, IO max, that can be delivered to the PC Card in regulation
is the allowable voltage drop across the IC, divided by the output-switch resistance.
I
O
max
+
V
DS
r
DS(on)
The xVCC outputs can deliver 1 A continuously at 5 V and 3.3 V within regulation over the operating temperature
range. The xVPP outputs of the IC can deliver 200 mA continuously.
overcurrent and overtemperature protection
PC Cards are inherently subject to damage that can result from mishandling. Host systems require protection
against short-circuited cards that could lead to power-supply or PCB trace damage. Even systems robust
enough to withstand a short circuit would still undergo rapid battery discharge into the damaged PC Card,
resulting in the rather sudden and unacceptable loss of system power. Most hosts include fuses for protection.
However, the reliability of fused systems is poor, as blown fuses require troubleshooting and repair, usually by
the manufacturer.
The TPS2216 takes a two-pronged approach to overcurrent protection, which is designed to activate if an output
is shorted or when an overcurrent condition is present when switches are powered up. First, instead of fuses,
sense FETs monitor each of the xVCC and xVPP power 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. Excessive current generates an error signal that limits the output
current of only the affected output, preventing damage to the host. Each xVCC output overcurrent limits from
1 A to 2.2 A, typically around 1.6 A; the xVPP outputs limit from 250 mA to 500 mA, typically around 375 mA.
Second, when an overcurrent condition is detected, the TPS2216 asserts an active low OC signal that can be
monitored by the microprocessor or controller to initiate diagnostics and/or send the user a warning message.
In the event that an overcurrent condition persists, causing the IC to exceed its maximum junction temperature,
thermal-protection circuitry activates. This shuts down all power outputs until the device cools to within a safe
operating region, which is ensured by a thermal shutdown hysteresis.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| TPS2216DAPRG4 | 功能描述:热插拔功率分布 1A Dual-Slot PC Card w/Serial Interface RoHS:否 制造商:Texas Instruments 产品:Controllers & Switches 电流限制: 电源电压-最大:7 V 电源电压-最小:- 0.3 V 工作温度范围: 功率耗散: 安装风格:SMD/SMT 封装 / 箱体:MSOP-8 封装:Tube |
| TPS2216DB | 功能描述:热插拔功率分布 Dual PCMCIA RoHS:否 制造商:Texas Instruments 产品:Controllers & Switches 电流限制: 电源电压-最大:7 V 电源电压-最小:- 0.3 V 工作温度范围: 功率耗散: 安装风格:SMD/SMT 封装 / 箱体:MSOP-8 封装:Tube |
| TPS2216DBG4 | 功能描述:热插拔功率分布 1A Dual-Slot PC Card w/Serial Interface RoHS:否 制造商:Texas Instruments 产品:Controllers & Switches 电流限制: 电源电压-最大:7 V 电源电压-最小:- 0.3 V 工作温度范围: 功率耗散: 安装风格:SMD/SMT 封装 / 箱体:MSOP-8 封装:Tube |
| TPS2216DBR | 功能描述:热插拔功率分布 1A Dual-Slot PC Card w/Serial Interface RoHS:否 制造商:Texas Instruments 产品:Controllers & Switches 电流限制: 电源电压-最大:7 V 电源电压-最小:- 0.3 V 工作温度范围: 功率耗散: 安装风格:SMD/SMT 封装 / 箱体:MSOP-8 封装:Tube |
| TPS2216DBRG4 | 功能描述:热插拔功率分布 1A Dual-Slot PC Card w/Serial Interface RoHS:否 制造商:Texas Instruments 产品:Controllers & Switches 电流限制: 电源电压-最大:7 V 电源电压-最小:- 0.3 V 工作温度范围: 功率耗散: 安装风格:SMD/SMT 封装 / 箱体:MSOP-8 封装:Tube |
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