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参数资料
| 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： | 10/31页 |
| 文件大小： | 1020K |
| 代理商： | TPS2411PWG4 |
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GATE DRIVE, CHARGE PUMP AND C(BYP)
FAST COMPARATOR INPUT FILTERING – C(FLTR)
(
)
÷
è
v2
t
= - R × C
× ln
DLY
(FLTR)
v -v
2 1
(4)
C(FLTR)
Source
Load
A
C
FLTR
Fast
Comparator
Turn-on
Amplifier/
Comparator
v
1
t
DLY
time
Comparator Input
Bus Transient
V
F
L
T
R
-A
v
1
t
DLY
time
Comparator Input
Bus Transient
V
F
L
T
R
-A
Dt
DLY
V
(FL
TR
-A)
V
(FL
TR
-A)
V2
V1
V2
SLVS727C – NOVEMBER 2006 – REVISED JUNE 2009 .................................................................................................................................................. www.ti.com
Gate drive of 270
A typical is generated by an internal charge pump and current limiter. A separate supply, V
DD,
is provided to avoid having the large charge pump currents interfere with voltage sensing by the A and C pins.
The GATE drive voltage is referenced to V(A) as GATE will only driven high when V(A) > V(C). The recommended
capacitor on BYP (bypass) must be used in order to form a quiet supply for the internal high-speed comparator.
V(GATE) must not exceed V(BYP).
The FLTR (filter) pin enables a simple method of filtering the input to the fast turn-off comparator as
demonstrated in Figure 14. To minimize the impact of a bus fault, the ORing controller turns off the external
MOSFET as fast as possible when a voltage reversal occurs. However, having a fast reaction increases the
likelihood that noise or non-fault transients may cause false triggering. Examples of such transients are ESD,
EFT, RF induction, step loads, and insertion of high-inrush units. The effect of the filter on a time-domain
transient are illustrated by assuming a step input from positive to negative. The expression for the time to reach 0
V across the fast comparator inputs follows, where the variables are defined in Figure 14.
Figure 14 graphically illustrates that the external MOSFET is turned off after a longer delay for a small transient
than a large voltage reversal. For example, the delay from 10 mV forward to 10-mV reverse is about 52 ns (R =
520
, C = 150 pF), while the delay for a 100-mV reverse transient is 7 ns. It is unlikely that the transient in a
real system is a step response, making exact calculations on the effect of the R-C filter to a specific transient
difficult.
The need for a C(FLTR), and its value, is dependent on the electrical noise environment of the particular system. If
the electrical environment is understood, the need for the filter, or its value, is selected based on approximations
or simulations. If the system is not understood or does not exist when the TPS2410 circuit design is completed, it
is recommended that a C(FLTR) of 100 pF be included in initial schematics. Evaluation of system performance may
allow removal of C(FLTR). The tolerance of the internal resistance is about ±25% including temperature variations.
Figure 14. Fast Comparator Input Filtering
18
Copyright 2006–2009, Texas Instruments Incorporated
Product Folder Link(s): TPS2410 TPS2411
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| 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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