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參數(shù)資料
| 型號： | TPS2056P |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | DUAL CURRENT-LIMITED POWER-DISTRIBUTION SWITCHES |
| 中文描述： | 雙限流配電開關(guān) |
| 文件頁數(shù)： | 20/23頁 |
| 文件大?。?/td> | 410K |
| 代理商： | TPS2056P |
TPS2046, TPS2056
DUAL CURRENT-LIMITED POWER-DISTRIBUTION SWITCHES
SLVS183 – APRIL 1999
20
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
generic hot-plug applications (see Figure 33)
In many applications it may be necessary to remove modules or pc boards while the main unit is still operating.
These are considered hot-plug applications. Such implementations require the control of current surges seen
by the main power supply and the card being inserted. The most effective way to control these surges is to limit
and slowly ramp the current and voltage being applied to the card, similar to the way in which a power supply
normally turns on. Due to the controlled rise times and fall times of the TPS2046 and TPS2056, these devices
can be used to provide a softer start-up to devices being hot-plugged into a powered system. The UVLO feature
of the TPS2046 and TPS2056 also ensures the switch will be off after the card has been removed, and the switch
will be off during the next insertion. The UVLO feature guarantees a soft start with a controlled rise time for every
insertion of the card or module.
Power
Supply
Block of
Circuitry
TPS2046
GND
IN
EN1
EN2
OC1
OUT1
OUT2
OC2
0.1
μ
F
1000
μ
F
Optimum
2.7 V to 5.5 V
PC Board
Overcurrent Response
Block of
Circuitry
Figure 33. Typical Hot-Plug Implementation
By placing the TPS2046 and TPS2056 between the V
CC
input and the rest of the circuitry, the input power will
reach these devices first after insertion. The typical rise time of the switch is approximately 2.5 ms, providng
a slow voltage ramp at the output of the device. This implementaion controls system surge currents and provides
a hot-plugging mechanism for any device.
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