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參數(shù)資料
| 型號： | FAN6863TY |
| 廠商： | FAIRCHILD SEMICONDUCTOR CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING CONTROLLER, PDSO6 |
| 封裝： | 1.6 MM, MO-193, SUPERSOT, 6 PIN |
| 文件頁數(shù)： | 4/16頁 |
| 文件大?。?/td> | 1243K |
| 代理商： | FAN6863TY |
2011 Fairchild Semiconductor Corporation
www.fairchildsemi.com
FAN6863 Rev. 1.0.1
12
FAN6863
—
Highly
Integrated
Green-Mode
PWM
Controller
Protections
Self-protective functions include VDD Over-Voltage
Protection (OVP), Open-Loop / Overload Protection
(OLP), Over-Current Protection (OCP), Short-Circuit
Protection (SCP), SENSE pin Short-Circuit Protection
(SSCP), and Over-Temperature Protection (OTP). OLP,
OCP,
SCP,
and
SSCP
are
auto-restart
mode
protections; OVP and OTP are latch-mode protections.
Auto-Restart Mode Protection
Once a fault condition is detected, switching is
terminated and the MOSFET remains off. This causes
VDD to fall because no more power is delivered from
auxiliary winding. When VDD falls to VDD-OFF (7V), the
protection is reset and the operating current reduces to
startup current, which causes VDD to rise. FAN6863
resumes normal operation when VDD reaches VDD-ON
(16V). In this manner, the auto-restart can alternately
enable and disable the switching of the MOSFET until
the fault condition is eliminated (see Figure 28).
Figure 28. Auto Restart Operation
Latch-Mode Protection
Once this protection is triggered, switching is terminated
and the MOSFET remains off. The latch is reset only
when VDD is discharged below 4V by unplugging the
AC power line.
Over-Current Protection (OCP)
FAN6863 has two over-current protection thresholds.
One is for pulse-by-pulse current limit, which turns off
MOSFET for the remainder of the switching cycle when
the sensing voltage of MOSFET drain current reaches
the threshold. The other threshold is for the over-current
protection, which shuts down the MOSFET gate when
the sensing voltage of MOSFET drain current is above
the threshold longer than the shutdown delay (60ms).
Open-Loop / Overload Protection (OLP)
When the upper branch of the voltage divider for the
shunt regulator (KA431 shown in Figure 29) is broken,
no current flows through the photo-coupler transistor,
which pulls up the feedback voltage to 5.2V.
When feedback voltage is above 4.6V for longer than
60ms, OLP is triggered. This protection is also triggered
when the SMPS output drops below the nominal value
for longer than 60ms due to the overload condition.
If the secondary output-short situation occurs when the
feedback voltage is above 4.6V, protection time is 7ms
for shorter debounce time.
Figure 29. OLP Operation
VDD Over-Voltage Protection (OVP)
VDD over-voltage protection prevents IC damage caused
by over voltage on the VDD pin. The OVP is triggered
when VDD reaches 22.5V. A debounce time (typically
50s) prevents false triggering by switching noise.
Over-Temperature Protection (OTP)
The OTP circuit is composed of current source and
voltage comparators. Typically, an NTC thermistor is
connected between the RT and GND pins. If the voltage
of this pin drops below a threshold of 1.0V, PWM output
is disabled after tDOTP debounce time. If this pin drops
below
0.7V,
it
triggers
the
latch-off
protection
immediately after tDOTP2 debounce time.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| FAN6863TY_SN00257 | 制造商:Fairchild Semiconductor Corporation 功能描述:Highly Integrated Green Mode P |
| FAN6863WLTY | 功能描述:初級與次級側(cè) PWM 控制器 Hi-Integrated Green Mode PWM Controller RoHS:否 制造商:ON Semiconductor 輸出端數(shù)量:1 開關(guān)頻率:250 KHz 工作電源電壓:- 0.3 V to + 28 V 最大工作溫度:+ 85 C 最小工作溫度:- 5 C 封裝 / 箱體:SOIC-8 Narrow 封裝:Reel |
| FAN6863WRTY | 功能描述:初級與次級側(cè) PWM 控制器 Hi-Integrated Green Mode PWM Controller RoHS:否 制造商:ON Semiconductor 輸出端數(shù)量:1 開關(guān)頻率:250 KHz 工作電源電壓:- 0.3 V to + 28 V 最大工作溫度:+ 85 C 最小工作溫度:- 5 C 封裝 / 箱體:SOIC-8 Narrow 封裝:Reel |
| FAN6863WTY | 功能描述:初級與次級側(cè) PWM 控制器 Hi-Integrated Green Mode PWM Controller RoHS:否 制造商:ON Semiconductor 輸出端數(shù)量:1 開關(guān)頻率:250 KHz 工作電源電壓:- 0.3 V to + 28 V 最大工作溫度:+ 85 C 最小工作溫度:- 5 C 封裝 / 箱體:SOIC-8 Narrow 封裝:Reel |
| FAN6920 | 制造商:Fairchild Semiconductor Corporation 功能描述: |
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