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參數(shù)資料
| 型號(hào)： | SG6848D |
| 廠商： | Electronic Theatre Controls, Inc. |
| 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> | 263K |
| 代理商： | SG6848D |
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Product Specification
Low Cost Green-Mode PWM Controller for Flyback Converters
SG6848
System General Corp.
Version 1.2(IRO33.0010.B0)
- 9 -
www.sg.com.tw
May.06, 2003
Under Voltage Lockout (UVLO)
The turn-on and turn-off thresholds of the SG6848
are fixed internally at 16.3V/11.7V. During start-up, the
hold-up capacitor must be charged to 16.3V through the
start-up resistor, so that the SG6848 will be enabled. The
hold-up capacitor will continue to supply V
DD
until power
can be delivered from the auxiliary winding of the main
transformer. V
DD
must not drop below 11.7V during this
start-up process. This UVLO hysteresis window ensures
that hold-up capacitor will be adequate to supply V
DD
during start-up.
Gate Output
The SG6848 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 15V 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 SG6848 has a
synchronized, positively-sloped ramp built-in at each
switching cycle. The slope of the ramp is:
(max)
33
.
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 SG6848, and increasing the power MOS gate
resistance is advised.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SG6848DY1 | 功能描述:電流型 PWM 控制器 Highly Integrated Gr Mode PWM Contrl 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 |
| SG6848DZ | 制造商:Rochester Electronics LLC 功能描述: 制造商:Fairchild Semiconductor Corporation 功能描述: |
| SG6848DZ1 | 功能描述:電流型 PWM 控制器 Lo Cost Gr-Mode PWM Ctrl Flyback Cnvrt 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 |
| SG6848T | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Low Cost Green-Mode PWM Controller for Flyback Converters |
| SG6848TZ | 功能描述:電流型 PWM 控制器 Lo Cost Gr-Mode PWM Ctrl Flyback Cnvrt 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 |
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