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| 型号： | TPS2411PWG4 |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 模拟信号调理 |
| 英文描述： | SPECIALTY ANALOG CIRCUIT, PDSO14 |
| 封装： | GREEN, PLASTIC, TSSOP-14 |
| 文件页数： | 9/31页 |
| 文件大小： | 1020K |
| 代理商： | TPS2411PWG4 |
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MOSFET SELECTION AND R(RSET)
-470.02
R(RSET)
V
- 0.00314
(OFF)
÷
=
÷
è
(2)
I(TURN_OFF) =- 1 A
V(THRESHOLD)
r
DS(on)
-10mV
10mW
I(TURN_OFF) =
(3)
www.ti.com .................................................................................................................................................. SLVS727C – NOVEMBER 2006 – REVISED JUNE 2009
MOSFET selection criteria include voltage rating, voltage drop, power dissipation, size, and cost. The voltage
rating consists of both the ability to withstand the rail voltage with expected transients, and the gate breakdown
voltage. The MOSFET gate rating should be the minimum of 12 V or the controlled rail voltage. Typically this
requires a ±20 V GATE voltage rating.
While rDS(on) is often chosen with the power dissipation, voltage drop, size and cost in mind, there are several
other factors to be concerned with in ORing applications. When using the TPS2410, the minimum voltage across
the device is 10 mV. A device that would have a lower voltage drop at full-load would be overspecified. When
using a TPS2411 or TPS2410 with RSET programmed to a negative voltage, the permitted static reverse current
is equal to the turn-off threshold divided by the rDS(on). While this current may actually be desirable in some
systems, the amount may be controlled by selection of rDS(on) and RSET. The practical range of rDS(on) runs from
the low milliohms to 40 m
for a single MOSFET.
MOSFETs may be paralleled for lower voltage drop (power loss) at high current. For TPS2410 operation, one
should plan for only one of the MOSFETs to carry current until the 10 mV regulation point is exceeded and the
loop forces GATE fully ON. TPS2411 operation does not rely on linear range operation, so the MOSFETs are all
ON or OFF together except for short transitional times. Beyond the control issues, current sharing depends on
the resistance match including both the rDS(on) and the connection resistance.
The TPS2410 may be used without a resistor on RSET. In this case, the turnoff V(AC) threshold is about 3 mV.
The TPS2411 may only be operated without an RSET programming resistor if the loading provides a higher
V(AC). A larger negative turnoff threshold reduces sensitivity to false tripping due to noise on the bus, but permits
larger static reverse current. Installing a resistor from RSET to ground creates a negative shift in the fast turn-off
threshold per Equation 2.
To obtain a –10 mV fast turnoff ( V(A) is less than V(C) by 10 mV ), R(RSET) = (–470.02/ ( –0.01–0.00314) ) ≈
35,700
. If a 10 m rDS(on) MOSFET was used, the reverse turnoff current is calculated as follows.
The sign indicates that the current is reverse, or flows from the MOSFET drain to source ( C to A ).
The turn-off speed of a MOSFET is influenced by the effective gate-source and gate-drain capacitance (CISS).
Since these capacitances vary a great deal between different vendor parts and technologies, they should be
considered when selecting a MOSFET where the fastest turn-off is desired.
Copyright 2006–2009, Texas Instruments Incorporated
17
Product Folder Link(s): TPS2410 TPS2411
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| TPS2411PWR | 功能描述:热插拔功率分布 N+1 OR-ing Pwr Rail Cntrlr 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 |
| TPS2411PWRG4 | 功能描述:热插拔功率分布 N+1 and OR-ing Pwr Rail Controller 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 |
| TPS2412D | 功能描述:热插拔功率分布 N+1/ORing Power Controller 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 |
| TPS2412DG4 | 功能描述:热插拔功率分布 N+1/ORing Pwr Cntrlr 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 |
| TPS2412DR | 功能描述:热插拔功率分布 N+1/ORing Power Controller 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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