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参数资料
| 型号： | TPS2458RHBR |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 电源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PQCC32 |
| 封装： | PLASTIC, QFP-32 |
| 文件页数： | 13/28页 |
| 文件大小： | 966K |
| 代理商： | TPS2458RHBR |
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12-V Inrush Slew Rate Control
OUT
SFC
g
V
I
t
C
D
@
D
(7)
R
SENSE
IN12
PASS
C
R>1k W
ToLoad
12-V ORing Operation for Redundant Systems
25V
Gnd
1
0
m
V
-
3
m
V
V
G
A
T
E
V
OR
SLUS916 – FEBRUARY 2009 ............................................................................................................................................................................................ www.ti.com
Although it is possible to slow the gate slew rate it is very unlikely that would be necessary since the TPS2458
limits inrush current at turn on. The limit level is programmed by the user.
As normally configured, the turn-on slew rate of the 12-V channel output voltage VOUT is shown in Equation 7.
where Isrc equals the current sourced by the PASS pin (nominally 30 A) and Cg equals the effective gate
capacitance. For purposes of this computation, the effective gate capacitance approximately equals the reverse
transfer capacitance, Crss. To reduce the slew rate, increase Cg by connecting additional capacitance from PASS
to ground. Place a resistor of at least 1000
in series with the additional capacitance to prevent it from
interfering with the fast turn off of the FET.
Figure 21. RC Slew Rate Control
The 12-V channels use external pass FETs to provide reverse blocking. The TPS2458 pulls the BLK pin high
when the input-to-output differential voltage VIN12–OUT12 exceeds a nominal value of 10 mV, and it pulls the
pin low when this differential falls below a nominal value of –3 mV. These thresholds provide a nominal 13 mV of
hysteresis to help prevent false triggering (Figure 21).
The source of the blocking FET connects to the source of the pass FET, and the drain of the blocking FET
connects to the load. This orients the body diode of the blocking FET such that it conducts forward current and
blocks reverse current. The body diode of the blocking FET does not normally conduct current because the FET
turns on when the voltage differential across it exceeds 10 mV.
Figure 22. ORing Thresholds
20
Copyright 2009, Texas Instruments Incorporated
Product Folder Link(s): TPS2458
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相关代理商/技术参数 |
参数描述 |
|---|---|
| TPS2458RHBT | 功能描述:热插拔功率分布 12V/3.3V Hot Swap & ORing 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 |
| TPS2458RHBT | 制造商:Texas Instruments 功能描述:Hot Swap Controllers TI |
| TPS2459EVM | 功能描述:电源管理IC开发工具 Full-Ftd AdvMC Slot Controller Eval Mod RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V |
| TPS2459RHBR | 功能描述:热插拔功率分布 3V/12V Hot Swap & ORing 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 |
| TPS2459RHBT | 功能描述:热插拔功率分布 3V/12V Hot Swap & ORing 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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