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參數(shù)資料
| 型號： | FAN6793MY |
| 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, PDSO16 |
| 封裝： | GREEN, MS-012AC, SOIC-16 |
| 文件頁數(shù)： | 7/20頁 |
| 文件大?。?/td> | 1044K |
| 代理商： | FAN6793MY |
2008 Fairchild Semiconductor Corporation
www.fairchildsemi.com
FAN6791 / FAN6793 Rev. 1.0.3
15
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ion
C
ont
roller
Interleave Switching
The
FAN6791/3
uses
interleaved
switching
to
synchronize the stand-by PWM / forward PWM stages.
This reduces switching noise and spreads the EMI
emissions. Figure 26 shows that an off-time tOFF is
inserted in between the turn-off of the stand-by gate
drives and the turn-on of the forward PWM.
Figure 26. Interleaved Switching
Slope Compensation
The stand-by PWM and forward PWM stage are
designed for flyback and forward power converters.
Peak-current-mode control is used to optimize system
performance. Slope compensation is added to stabilize
the
current
loop.
The
FAN6791/3
inserts
a
synchronized, positively sloped ramp at each switching
cycle. The positively sloped ramp is represented by the
voltage signal Vs-comp in Figure 27.
Figure 27. Slope Compensation
Gate Drivers
FAN6791/3 output stages are fast totem-pole gate
drivers. The output driver is clamped by an internal 18V
Zener diode to protect the power MOSFET.
Constant Power Control
To limit the output power of the converter constantly, a
power-limit function is included. Sensing the converter
input voltage through the VRMS pin, the power limit
function generates a relative peak-current-limit threshold
voltage for constant power control, as shown in Figure 28.
Figure 28. Constant Power Control
Protections
The FAN6791/3 provides full protection functions to
prevent the power supply and the load from being
damaged. The protection features include:
VDD Over-Voltage Protection. The stand-by PWM and
forward PWM stages will be disabled whenever the VDD
voltage exceeds the over-voltage threshold.
AC Under-Voltage Protection.
The VRMS pin is used to
detect the AC input voltage. When voltage is lower than
the brownout threshold, voltage disables both forward
and stand-by PWM.
RI Pin Open / Short Protection
. The RI pin is used to set
the switching frequency and internal current reference.
The stand-by PWM and forward PWM stages are
disabled whenever the RI pin is short or open.
Open-Loop Protection
. The stand-by PWM and forward
PWM stages of FAN6791/3 is disabled whenever the
FBFYB / FBPWM pin is open.
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| FAN6793NY | 功能描述:監(jiān)控電路 Highly Intgrtd Dual PWM Combo Controller RoHS:否 制造商:STMicroelectronics 監(jiān)測電壓數(shù): 監(jiān)測電壓: 欠電壓閾值: 過電壓閾值: 輸出類型:Active Low, Open Drain 人工復位:Resettable 監(jiān)視器:No Watchdog 電池備用開關:No Backup 上電復位延遲（典型值）:10 s 電源電壓-最大:5.5 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:UDFN-6 封裝:Reel |
| 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:- 標準包裝: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 |
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