參數(shù)資料
型號(hào)： FAN6921MLMY
廠商： Fairchild Semiconductor
文件頁(yè)數(shù)： 21/23頁(yè)
文件大?。?/td> 1764K
描述： IC CTLR PFC/FLYBACK 16-SOICN
標(biāo)準(zhǔn)包裝： 2,500
模式： 臨界傳導(dǎo)（CRM）
電流 - 啟動(dòng)： 10µA
電源電壓： 8.5 V ~ 25 V
工作溫度： -40°C ~ 105°C
安裝類型： 表面貼裝
封裝/外殼： 16-SOIC（0.154"，3.90mm 寬）
供應(yīng)商設(shè)備封裝： 16-SOIC N
包裝： 帶卷 (TR)
 
?2010 Fairchild Semiconductor Corporation
 
www.fairchildsemi.com
FAN6921ML " Rev. 1.0.3
21
 
Open-Loop, Short-Circuit, and Overload Protection
(FB Pin)
Referring to Figure 45, outside of FAN6921ML; the FB
pin is connected to the collector of transistor of an opto-
coupler. Inside of FAN6921ML, the FB pin is connected
to an internal voltage bias through a resistor of ~5 kW.
As the output loading is increased, the output voltage is
decreased and the sink current of transistor of opto-
coupler on primary side is reduced. So the FB pin
voltage is increased by internal voltage bias. In the case
of an open loop, output short circuit, or overload
conditions; this sink current is further reduced and the
FB pin voltage is pulled to high level by internal bias
voltage. When the FB pin voltage is higher than 4.2 V
for 50ms, the FB pin protection is activated.
FB
V
O
Open-loop
Short-circuit / overload
 
Figure 45. FB Pin Open-Loop, Short Circuit,
and Overload Protections
Under-Voltage Lockout (UVLO, VDD Pin)
Referring to Figure 36 and Figure 37, the turn-on and
turn-off V
DD
  threshold voltages are fixed at 18 V and
10 V, respectively. During startup, the hold-up capacitor
(V
DD
  capacitor) is charged by the HV startup current
until V
DD
 voltage reaches the turn-on voltage. Before the
output voltage rises to rated voltage and delivers energy
to the V
DD
 capacitor from auxiliary winding, this hold-up
capacitor has to sustain the V
DD
  voltage energy for
operation. When V
DD
  voltage reaches turn-on voltage,
FAN6921ML   starts   all   switching   operation   if   no
protection is triggered before V
DD
 voltage drops to turn-
off voltage V
DD-PWM-OFF
.
 
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FAN6921MR 制造商:FAIRCHILD 制造商全稱:Fairchild Semiconductor 功能描述:Integrated Critical-Mode PFC / Quasi-Resonant Current-Mode PWM Controller
FAN6921MRMY 功能描述:電流型 PWM 控制器 Crtcl Md PFC & Quasi Res Cur Md PWM Cntlr RoHS:否 制造商:Texas Instruments 開關(guān)頻率:27 KHz 上升時(shí)間: 下降時(shí)間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數(shù)量:1 最大工作溫度:+ 105 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TSSOP-14
FAN6961 制造商:FAIRCHILD 制造商全稱:Fairchild Semiconductor 功能描述:Interleaved Dual BCM PFC Controllers
FAN6961BMY 制造商:Fairchild Semiconductor Corporation 功能描述:
FAN6961DY 功能描述:功率因數(shù)校正 IC Green mode PFC Fwd PWM Controller RoHS:否 制造商:Fairchild Semiconductor 開關(guān)頻率:300 KHz 最大功率耗散: 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Reel
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