- 您現(xiàn)在的位置：買賣IC網(wǎng) > Datasheet目錄38 > FAN6921MRMY (Fairchild Semiconductor)IC CTLR PFC/FLYBACK 16-SOICN Datasheet資料下載
參數(shù)資料
| 型號： | FAN6921MRMY |
| 廠商： | Fairchild Semiconductor |
| 文件頁數(shù)： | 18/24頁 |
| 文件大?。?/td> | 1210K |
| 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： | 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) |
?2009 Fairchild Semiconductor Corporation
www.fairchildsemi.com
FAN6921MR Rev. 1.0.4
18
PFC Peak Current Limiting (CSPFC pin)
During PFC stage switching operation, the PFC switch
current is detected by current-sense resistor on the
CSPFC pin and the detected voltage on this resistor is
delivered to input terminal of a comparator and
compared with a threshold voltage 0.82 V (typical).
Once the CSPFC pin voltage is higher than the
threshold voltage, PFC gate is turned off immediately.
The PFC peak switching current is adjustable by the
current-sense resistor. Figure 33 shows the measured
waveform of PFC gate and CSPFC pin voltage.
Figure 33. Cycle-by-Cycle Current Limiting
Brown-In / Out Protection (VIN Pin)
With AC voltage detection, FAN6921MR can perform
brown-in/ out protection (AC voltage UVP). Figure 34
shows the key operation waveforms of brown-in / out
protection. Both use the VIN pin to detect AC input
voltage level and the VIN pin is connected to AC input
by a resistor divider (refer to Figure 1); therefore, the
V
VIN
voltage is proportional to the AC input voltage.
When the AC voltage drops, and V
VIN
voltage is lower
than 1 V for 100 ms, the UVP protection is activated and
the COMP pin voltage is clamped to around 1.6 V.
Because PFC gate duty is determined by comparing
sawtooth waveform and COMP pin voltage, lower
COMP voltage results in narrow PFC on-time, so that
the energy converged is limited and the PFC output
voltage decreases. When INV pin is lower than 1.2 V,
FAN6921MR stops all PFC and PWM switching
operation immediately until V
DD
voltage drops to turn-off
voltage then raises to turn-on voltage again (UVLO).
When the brownout protection is activated, all switching
operation is turned off, V
DD
voltage enters hiccup mode
up and down continuously. Until V
VIN
voltage is higher
than 1.3 V (typical) and V
DD
reaches turn-on voltage
again, the PWM and PFC gate is sent out.
The measured waveforms of brown-in / out protection
are shown in Figure 35.
Figure 34. Operation Waveforms of Brown-In/ Out
Protection
Figure 35. Measured Waveform of Brown-In/ Out
Protection (Adapter Application)
OPFC
OPWM
AC Input
V
DD
V
DD
Hiccup Mode
Brownout
Brown-In
OPFC
CSPFC
PFC MOS Current Limit
0.82V
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| FAN6961SZ | IC PFC CONTROLLER DCM 8SOP |
| FAN6982MY | IC CTLR PFC CCM 14-SOICN |
| FAN7527BN | IC PFC CTRLR TRANSITION 8DIP |
| FAN7529MX | IC PFC CTRLR CRM/TRANSITION 8SOP |
| FAN7930BM | IC PFC CTLR CRITICAL CONF 8-SOIC |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| 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 |
| FAN6961DZ | 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 |
| FAN6961SY | 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 |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。