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| 型號(hào)： | TP6508 |
| 英文描述： | Pushbutton Switch; Actuator Diameter:0.078"; Circuitry:6PDT; Switch Operation:6 Changeover Push-Push; Contact Current Max:100mA; Leaded Process Compatible:Yes; Mounting Type:PCB; Switch Function:6PDT |
| 中文描述： | 顯卡 |
| 文件頁(yè)數(shù)： | 44/134頁(yè) |
| 文件大?。?/td> | 600K |
| 代理商： | TP6508 |
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P.41
* Flat Panel Power sequencing
The TP6508’s power supply management design is very flexible . The following Figure shows
the timing diagram and the control signals related to power supply management . It is a very helpful
reference for VGA designing with portable or notebook computers .
It is worth mentioning that the FPVCC, FPVEE, and FPBACK signals can effectively resolve
problems of LCD power sequencing . The FPVCC signal is used to turn On/OFF the digital power(+5
Volt) for the digital logic of the LCD panel . The FPVEE signal is sent to bias voltage generator of the
LCD panel driver for control signal ON/OFF application . The FPBACK signal can be sent to the
back-light voltage generator to administer ON/OFF control .
There must be a 64ms skew between the FPVCC’s and FPVEE’s timing during power on(into On
mode) sequence and be a 16ms skew during power off (into Standby/Suspend/Off/Cover-Close mode)
sequence . The sequence is reversed between Power On and Power Off. For the convenience of
design, the length of skew is fixed and not adjustable, but Topro is confident that this skew will satisfy
the requirement of most panels .
FPVCC
LCD Digital Logic Power
Signals
LCD Panel Power Sequencing
[SP508B11.DSF]
FPVEE
LCD Driver Power
low
Skew 16 ms
Skew 16 ms
On-Mode
Panel-off
Panel-off
Panel-on power sequcnce
Panel-off power sequcnce
Skew 64 ms
Off-Mode
Off-Mode
RESET
Skew 64 ms
VDD
(+5V)
Skew 64 ms
low
(FLM / LP Tri-state)
FPBACK
LCD Backlight Power
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