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參數(shù)資料
| 型號(hào)： | LM3880 |
| 廠商： | National Semiconductor Corporation |
| 英文描述： | Power Sequencer |
| 中文描述： | 電力序 |
| 文件頁數(shù)： | 9/12頁 |
| 文件大小： | 619K |
| 代理商： | LM3880 |
Application Information
(Continued)
20192617
EN Glitch
If the enable signal remains high for the entire power-up
sequence, then the part will operate as shown in the stan-
dard timing diagrams. However, if the enable signal is de-
asserted before the power-up sequence is completed the
part will enter a controlled shutdown. This allows the system
to walk through a controlled power cycling, preventing any
latch conditions from occuring. This state only occurs if the
enable pin is de-asserted after the completion of timer 1, but
before the entire power-up sequence is completed.
When this event occurs, the falling edge of enable pin resets
the current timer and will allow the remaining power-up cycle
to complete before beginning the power down sequence.
The power down sequence starts approximately 120ms after
the final power-up flag. This allows output voltages in the
system to stabilize before everything is shutdown. An ex-
ample of this operation can be seen below:
20192618
Incomplete Sequence
All the internal timers are generated by a master clock that
has an extremely low tempco. This allows for tight accuracy
across temperature and a consistent ratio between the indi-
vidual timers. There is a slight additional delay of approxi-
mately 400us to timers 1 and 4 which is a result of the
EPROM refresh. This refresh time is in addition to the pro-
grammed delay time and will be almost insignificant to all but
the shortest of timer delays.
CUSTOM SEQUENCER
The LM3880 Power Sequencer is based on a CMOS pro-
cess utilizing an EPROM that has the capability to be custom
programmed at the factory. Approximately 500,000,000 dif-
ferent options are available allowing even the most complex
system to be simply sequenced. Because of the vast options
that are possible, customization is limited to orders of a
certain quantity. Please contact National Semiconductor for
more information.
The variables that can be programmed include the six delay
timers and the reverse sequence order. For the timers, each
can be individually selected from one of the timer selector
columns in the table shown below. However, all six time
delays must be from the same column.
L
www.national.com
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相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LM3880MF-1 | Power Sequencer |
| LM3880MFX-1 | Power Sequencer |
| LM3886 | LM3886 Overture⑩ Audio Power Amplifier Series High-Performance 68W Audio Power Amplifier w/Mute |
| LM3886T | LM3886 Overture⑩ Audio Power Amplifier Series High-Performance 68W Audio Power Amplifier w/Mute |
| LM3886TF | LM3886 Overture⑩ Audio Power Amplifier Series High-Performance 68W Audio Power Amplifier w/Mute |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LM3880_07 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Power Sequencer |
| LM3880_08 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Power Sequencer |
| LM3880EVAL | 功能描述:電源管理IC開發(fā)工具 EVAL BOARD RoHS:否 制造商:Maxim Integrated 產(chǎn)品:Evaluation Kits 類型:Battery Management 工具用于評估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V |
| LM3880MF-1 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Power Sequencer |
| LM3880MF-1AA | 功能描述:監(jiān)控電路 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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