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參數(shù)資料
| 型號： | FAN6793NY |
| 廠商： | FAIRCHILD SEMICONDUCTOR CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | DUAL SWITCHING CONTROLLER, 68 kHz SWITCHING FREQ-MAX, PDIP16 |
| 封裝： | GREEN, MS-001BB, DIP-16 |
| 文件頁數(shù)： | 6/20頁 |
| 文件大小： | 1044K |
| 代理商： | FAN6793NY |
2008 Fairchild Semiconductor Corporation
www.fairchildsemi.com
FAN6791 / FAN6793 Rev. 1.0.3
14
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Functional Description
The
highly
integrated
FAN6791/3
dual-PWM
combination controller provides several features to
enhance the performance of converters.
Proprietary interleave switching synchronizes the
flyback and forward PWM stages. This reduces
switching noise.
The proprietary frequency jittering function for the
flyback and forward PWM stages helps reduce
switching EMI emissions.
For the flyback and forward PWM, the synchronized
slope compensation ensures the stability of the current
loop under continuous-mode operation. In addition,
FAN6791/3 provides complete protection functions,
such as brownout protection and RI open/short.
Startup Current
For startup, the HV pin is connected to the line input or
bulk
capacitor
through
external
resistor
RHV,
recommended as 100k. Typical startup current drawn
from pin HV is 2mA and it charges the hold-up capacitor
through the resistor RHV. When the VDD capacitor level
reaches VDD-ON, the startup current switches off. At this
moment, the VDD capacitor only supplies the FAN6791/3
to maintain the VDD before the auxiliary winding of the
main transformer provides the operating current.
Oscillator Operation
A resistor connected from the RI pin to the GND pin
generates a constant current source for the FAN6791/3
controller. This current is used to determine the center
PWM frequency. Increasing the resistance reduces
PWM frequency. Using a 24k resistor results in a
corresponding 65kHz PWM frequency. The switching
frequency is programmed by the resistor RI connected
between RI pin and GND. The relationship is:
)
kHz
(
)
(k
R
1560
f
I
PWM
Ω
=
(1)
The range of the PWM oscillation frequency is designed
as 33kHz ~ 130kHz. FAN6791/3 integrates frequency
hopping function internally. The frequency variation
ranges from around 61kHz to 69kHz for a center
frequency 65kHz. The frequency hopping function helps
reduce EMI emission of a power supply with minimum
line filters.
For power saving, flyback PWM stage has a green
mode function. Frequency linearly decreases when VFB
is within VG and VN. Once VFB is lower than VG,
switching frequency disables, and it enters burst mode.
Figure 23. Oscillation Frequency in Green Mode
Line Voltage Detection (VRMS)
Figure 24 shows a resistive divider with low-pass
filtering for line-voltage detection on VRMS pin. The
VRMS voltage is used for high/low line compensation that
keeps the constant power limit and provides brownout
protection. For brownout protection, when the VRMS
voltage drops below 0.8V, OPWM turns off.
Figure 24. Line-Voltage Detection on VRMS Pin
Remote On/Off
Figure 25 shows the remote on / off function. When the
supervisor FPO pin pulls down and enables the system
by connecting an opto-coupler, VREF applies to the
ON/OFF pin to enable forward PWM stage.
Figure 25. Remote On/Off
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| FAN6861 | 制造商:FAIRCHILD 制造商全稱:Fairchild Semiconductor 功能描述:Low-Cost, Highly Integrated, Green-Mode PWM Controller for Peak Power Management |
| FAN6861TY | 功能描述:IC REG CTRLR FLYBK ISO PWM 6SSOT RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- PWM 型:電流模式 輸出數(shù):1 頻率 - 最大:500kHz 占空比:100% 電源電壓:8.2 V ~ 30 V 降壓:無 升壓:無 回掃:是 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:是 工作溫度:0°C ~ 70°C 封裝/外殼:8-DIP（0.300"，7.62mm） 包裝:管件 產(chǎn)品目錄頁面:1316 (CN2011-ZH PDF) |
| FAN6862 | 制造商:FAIRCHILD 制造商全稱:Fairchild Semiconductor 功能描述:Highly Integrated Green-Mode PWM Controller |
| FAN6862_10 | 制造商:FAIRCHILD 制造商全稱:Fairchild Semiconductor 功能描述:Highly Integrated Green-Mode PWM Controller |
| FAN6862HRTY | 功能描述:電壓模式 PWM 控制器 Highly Int. Grn-Mode PWM Controller RoHS:否 制造商:Texas Instruments 輸出端數(shù)量:1 拓?fù)浣Y(jié)構(gòu):Buck 輸出電壓:34 V 輸出電流: 開關(guān)頻率: 工作電源電壓:4.5 V to 5.5 V 電源電流:600 uA 最大工作溫度:+ 125 C 最小工作溫度:- 40 C 封裝 / 箱體:WSON-8 封裝:Reel |
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