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參數資料
| 型號： | TPS3808G33MDBVREP |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 電源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO6 |
| 封裝： | GREEN, PLASTIC, SOT-23, 6 PIN |
| 文件頁數： | 15/15頁 |
| 文件大?。?/td> | 530K |
| 代理商： | TPS3808G33MDBVREP |
C
T (nF)
+ tD (s)*0.5
10*3 (s)
175
(1)
1.2V
3.3V
TPS3808G12
TPS3808G33
DSP
SENSE
V
DD
V
DD
SENSE
V
I/O
V
CORE
GPIO
GND
RESET
MR
C
T
C
T
RESET
IMMUNITY TO SENSE PIN VOLTAGE
3.3V
TPS3808xxx
V
DD
SENSE
MR
90kW
GND
SELECTING THE RESET DELAY TIME
Delay (s) = CT (nF) + 0.5 x 103 (s)
20ms Delay
300ms Delay
(c)
(b)
(a)
175
3.3V
TPS3808G33
V
DD
SENSE
C
T
RESET
3.3V
TPS3808G33
V
DD
SENSE
C
T
C
T
RESET
3.3V
TPS3808G33
V
DD
SENSE
C
T
50k
RESET
www.ti.com ................................................................................................................................................. SBVS103C – APRIL 2008 – REVISED NOVEMBER 2008
affected by the choice of resistor. Figure 14b shows a
fixed 20-ms delay time by leaving the CT pin open.
Figure 14c shows a ground referenced capacitor
connected to CT for a user-defined program time
between 1.25 ms and 10 s.
The capacitor CT should be ≥ 100 pF nominal value
in order for the TPS3808xxx to recognize that the
capacitor is present. The capacitor value for a given
delay time can be calculated using the following
equation:
The reset delay time is determined by the time it
Figure 12. Using MR to Monitor Multiple System
takes an on-chip precision 220-nA current source to
Voltages
charge the external capacitor to 1.23 V. When a
RESET is asserted the capacitor is discharged. When
the RESET conditions are cleared, the internal
current source is enabled and begins to charge the
external capacitor. When the voltage on this capacitor
reaches 1.23 V, RESET is deasserted. Note that a
low-leakage type capacitor such as a ceramic should
be used, and that stray capacitance around this pin
may cause errors in the reset delay time.
TRANSIENTS
The TPS3808 is relatively immune to short negative
Figure 13. Using an External MOSFET to Minimize
transients on the SENSE pin. Sensitivity to transients
IDD When MR Signal Does Not Go to VDD
is dependent on threshold overdrive, as shown in the
Maximum Transient Duration at Sense vs Sense
Threshold Overdrive Voltage graph (Figure 6) in the
Typical Characteristics section.
The TPS3808 has three options for setting the
shows the configuration for a fixed 300-ms typical
delay time by tying CT to VDD; a resistor from 40 k
to 200 k
must be used. Supply current is not
Figure 14. Configuration Used to Set the RESET Delay Time
Copyright 2008, Texas Instruments Incorporated
9
Product Folder Link(s): TPS3808-EP
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相關代理商/技術參數 |
參數描述 |
|---|---|
| TPS3808G33QDBVRMO | 制造商:Rochester Electronics LLC 功能描述: 制造商:Texas Instruments 功能描述: |
| TPS3808G33QDBVRQ1 | 功能描述:監控電路 Lo Quies Current Pro Delay Sup Circuit RoHS:否 制造商:STMicroelectronics 監測電壓數: 監測電壓: 欠電壓閾值: 過電壓閾值: 輸出類型:Active Low, Open Drain 人工復位:Resettable 監視器:No Watchdog 電池備用開關:No Backup 上電復位延遲（典型值）:10 s 電源電壓-最大:5.5 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:UDFN-6 封裝:Reel |
| TPS3808G50DBVR | 功能描述:監控電路 Programmable-Delay Supervisory RoHS:否 制造商:STMicroelectronics 監測電壓數: 監測電壓: 欠電壓閾值: 過電壓閾值: 輸出類型:Active Low, Open Drain 人工復位:Resettable 監視器:No Watchdog 電池備用開關:No Backup 上電復位延遲（典型值）:10 s 電源電壓-最大:5.5 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:UDFN-6 封裝:Reel |
| TPS3808G50DBVRG4 | 功能描述:監控電路 Programmable-Delay Supervisory RoHS:否 制造商:STMicroelectronics 監測電壓數: 監測電壓: 欠電壓閾值: 過電壓閾值: 輸出類型:Active Low, Open Drain 人工復位:Resettable 監視器:No Watchdog 電池備用開關:No Backup 上電復位延遲（典型值）:10 s 電源電壓-最大:5.5 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:UDFN-6 封裝:Reel |
| TPS3808G50DBVT | 功能描述:監控電路 Programmable-Delay Supervisory RoHS:否 制造商:STMicroelectronics 監測電壓數: 監測電壓: 欠電壓閾值: 過電壓閾值: 輸出類型:Active Low, Open Drain 人工復位:Resettable 監視器:No Watchdog 電池備用開關:No Backup 上電復位延遲（典型值）:10 s 電源電壓-最大:5.5 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:UDFN-6 封裝:Reel |
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