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參數(shù)資料
| 型號(hào)： | SG6859 |
| 廠商： | Fairchild Semiconductor Corporation |
| 英文描述： | Low Cost Green-Mode PWM Controller for Flyback Converters |
| 中文描述： | 低成本綠色模式PWM控制器，用于回掃轉(zhuǎn)換 |
| 文件頁(yè)數(shù)： | 9/13頁(yè) |
| 文件大?。?/td> | 483K |
| 代理商： | SG6859 |
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Product Specification
Low Cost Green-Mode PWM Controller for Flyback Converters
SG6859
Gate Output
System General Corp.
Version 1.2.1(IAO33.0067.B2)
- 9 -
www.sg.com.tw
www.fairchildsemi.com
September 28, 2007
The SG6859 BiCMOS output stage is a fast totem
pole gate driver. Cross conduction has been avoided to
minimize heat dissipation, increase efficiency, and
enhance reliability. The output driver is clamped by an
internal 17V Zener diode in order to protect power
MOSFET transistors against undesired over-voltage gate
signals.
Built-in Slope Compensation
The sensed voltage across the current sense resistor
is used for current mode control and pulse-by-pulse
current limiting. Built-in slope compensation will
improve stability and prevent sub-harmonic oscillations
due to peak-current mode control. The SG6859 has a
synchronized, positively-sloped ramp built-in at each
switching cycle. The slope of the ramp is:
.)
(max
36
.
Duty
Duty
×
Noise Immunity
Noise from the current sense or the control signal can
cause significant pulse width jitter, particularly in
continuous-conduction mode. While slope compensation
helps alleviate these problems, further precautions should
still be taken. Good placement and layout practices should
be followed. Avoiding long PCB traces and component
leads, locating compensation and filter components near
the SG6859, and increasing the power MOS gate
resistance is advised.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| SG6859DZ | Low Cost Green-Mode PWM Controller for Flyback Converters |
| SG6859TZ | Low Cost Green-Mode PWM Controller for Flyback Converters |
| SG6901A | PFC / Flyback PWM Controller |
| SG6901ASZ | PFC / Flyback PWM Controller |
| SG6902 | Green-Mode PFC / Flyback-PWM Controller |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SG6859A | 制造商:FAIRCHILD 制造商全稱:Fairchild Semiconductor 功能描述:Low-Cost, Green-Mode PWM Controller for Flyback Converters |
| SG6859A_10 | 制造商:FAIRCHILD 制造商全稱:Fairchild Semiconductor 功能描述:Low-Cost, Green-Mode PWM Controller for Flyback Converters |
| SG6859ADY | 制造商:FAIRCHILD 制造商全稱:Fairchild Semiconductor 功能描述:Low-Cost, Green-Mode PWM Controller for Flyback Converters |
| SG6859ADZ | 功能描述:電流型 PWM 控制器 Current Mode PWM Controller 8-Pin RoHS:否 制造商:Texas Instruments 開(kāi)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 |
| SG6859AT | 制造商:Fairchild Semiconductor Corporation 功能描述: |
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