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參數(shù)資料
| 型號： | TL7705 |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | Supply voltage Supervisor |
| 中文描述： | 電源電壓監(jiān)控 |
| 文件頁數(shù)： | 10/17頁 |
| 文件大?。?/td> | 340K |
| 代理商： | TL7705 |
Application
examples
6
Literature Number: SLVAE04
Figure 6. Voltage Supervision of a multiple power supply
In larger systems, where several supply voltages are required, it is necessary to supervise all supply
voltages which may cause dangerous conditions in case of power failure. In the circuit diagram of figure 6,
two TL7712A's are used to monitor the positive and the negative 12 volt supplies. Their outputs are fed to
the RESIN input of the TL7705A, which monitors the 5 volt supply. The output of this device provides a
reset signal, which becomes active whenever any one of the three supply voltages fails. A reset signal can
be generated manually via a switch which is connected to the voltage monitor of the positive 12V supply.
When designing a supply voltage monitor the designer has to take care, that when only one of the supply
voltages becomes marginal or fails, a defined reset signal is generated (at least if the main supply voltage
5 V is still available). Therefore the circuit which monitors the 12V supply voltage is supplied by the 5 V
supply. The reset signal of the circuit which monitors the negative supply is fed via a resistor divider to the
base of the transistor BC546, which controls the RESIN input of the TL7705A. The voltage divider is
designed so that a reset is generated even if the negative supply fails totally.
The capacitor which determines the delay of the two circuits which monitors the both 12v supplies, can be
chosen short (in the example shown here it is 0.01
μ
F). The output of these circuits has only to trigger the
third monitor TL7705A. The final duration of the reset signal will be determined by the capacitor C
t
of the
last mentioned circuit.
These supply voltage supervisor circuits were designed to detect supply voltage drops as short as
>300 ns. In figure 7 the minimum pulse width t
dmin
at the SENSE input is shown versus the amplitude of the
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PDF描述 |
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| TL7702 | Supply voltage Supervisor |
| TL7709 | Supply voltage Supervisor |
| TL7712 | Supply voltage Supervisor |
| TL7715 | Supply voltage Supervisor |
| TLAD0110G | 10 Gbits/s Laser Driver(10 G位/秒激光驅(qū)動器) |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TL7705A | 制造商:TI 制造商全稱:Texas Instruments 功能描述:SUPPLY-VOLTAGE SUPERVISORS |
| TL7705A_10 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:SUPPLY-VOLTAGE SUPERVISORS |
| TL7705AC | 制造商:TI 功能描述:7705 TI IN S3D8A 制造商:Texas Instruments 功能描述: |
| TL7705AC10 | 制造商:Texas Instruments 功能描述: |
| TL7705ACD | 功能描述:監(jiān)控電路 4.55V Monitor RoHS:否 制造商:STMicroelectronics 監(jiān)測電壓數(shù): 監(jiān)測電壓: 欠電壓閾值: 過電壓閾值: 輸出類型:Active Low, Open Drain 人工復(fù)位:Resettable 監(jiān)視器:No Watchdog 電池備用開關(guān):No Backup 上電復(fù)位延遲（典型值）:10 s 電源電壓-最大:5.5 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:UDFN-6 封裝:Reel |
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