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參數資料
| 型號： | FAN7680N |
| 廠商： | FAIRCHILD SEMICONDUCTOR CORP |
| 元件分類： | 電源管理 |
| 英文描述： | PC Power Supply Outputs Monitoring IC |
| 中文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDIP8 |
| 封裝： | DIP-8 |
| 文件頁數： | 12/16頁 |
| 文件大小： | 234K |
| 代理商： | FAN7680N |
FAN7680
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during 75ms to avoid turn-on failure. At turn-off, there is an additional delay of 2.3ms from PSON to FPO.
Power should be delivered to the rails only when the PSON signal is held at ground potential, thus the FPO becomes a low
state after a debounce of 38ms. The FPO pin can be connected to +5V(or up to +15V) through a pull-up resistor.
Under Voltage Protection(UVP)
The FAN7680 provides undervoltage protection(UVP) for the +3.3V, +5V, and +12V power rails. When an undervoltage con-
dition appears at one of the VS33(+3.3V), VS5(+5V), or Vcc(+12V) input pins for more than 73us, the PGO goes low and
FPO output goes high. Also, this fault condition will be latched until the PSON is toggled from low to high or the Vcc falls
below a minimum operating voltage.
When the power supply is turned on by the AC input or PSON, an internal UVP delay is 75ms. But at normal state an UVP
delay time is a 73us debounce time. The need for undervoltage protection is often overlooked in off-line switching power sup-
ply system design. But it is very important in battery powered or hand-held equipment since the TTL or CMOS logic often
malfunctions under UVP condition.
Over Voltage Protection(OVP)
The overvoltage protection(OVP) of the FAN7680 monitors +3.3V, +5V, and +12V(the +12V output is sensed via the Vcc
pin). When an overvoltage condition appears at one of the +3.3V, +5V, or +12V input pins for more than 73us, the FPO output
goes high and the PGO goes low. Also, this fault condition will be latched until the PSON is toggled from low to high or Vcc
drops below a minimum operating voltage. During fault conditions, most power supplies have the potential to deliver higher
output voltages than those normally specified or required. In unprotected equipment, it is possible for output voltages to be
high enough to cause internal or external damage to the system. To protect the system under these abnormal conditions, it is
common practice to provide overvoltage protection within the power supply.
Because TTL and CMOS circuits are very vulnerable to overvoltage, it is becoming industry standard to provide overvoltage
protection on all +3.3V, +5V, and +12V outputs. Therefore, not only the +3.3V and +5V rails for the logic circuits on the moth-
erboard need to be protected, but also the +12V peripheral devices such as the hard disk, flopply disk, and CD-ROM players
etc., need to be protected.
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| FAN7685 | PC Power Supply Output Monitoring IC |
| FAN7685M | PC Power Supply Output Monitoring IC |
| FAN7685MX | PC Power Supply Output Monitoring IC |
| FAN7685N | PC Power Supply Output Monitoring IC |
| FAN7686 | ECONOLINE: REC3-S_DRW(Z)/H4,H6 - Safety standards and approval: EN 60950 certified, rated for 250VAV (LVD test report)- Applied for Ul 1950 Component Recognised Certification- 3W DIP Package- 4kVDC & 6kVDC Isolation- Regulated Output- Continuous Short Circiut Protection Auto-Restarting |
相關代理商/技術參數 |
參數描述 |
|---|---|
| FAN7685 | 制造商:FAIRCHILD 制造商全稱:Fairchild Semiconductor 功能描述:PC Power Supply Output Monitoring IC |
| FAN7685M | 制造商:FAIRCHILD 制造商全稱:Fairchild Semiconductor 功能描述:PC Power Supply Output Monitoring IC |
| FAN7685MX | 制造商:FAIRCHILD 制造商全稱:Fairchild Semiconductor 功能描述:PC Power Supply Output Monitoring IC |
| FAN7685N | 制造商:FAIRCHILD 制造商全稱:Fairchild Semiconductor 功能描述:PC Power Supply Output Monitoring IC |
| FAN7686 | 制造商:FAIRCHILD 制造商全稱:Fairchild Semiconductor 功能描述:PC Power Supply Output Monitoring IC |
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