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參數(shù)資料
| 型號： | SG6846A |
| 廠商： | Fairchild Semiconductor Corporation |
| 英文描述： | Highly Integrated Green-Mode PWM Controller |
| 中文描述： | 高度集成的綠色模式PWM控制器 |
| 文件頁數(shù)： | 10/13頁 |
| 文件大小： | 494K |
| 代理商： | SG6846A |
Product Specification
Highly Integrated Green-Mode PWM Controller
SG6846A
System General Corp.
Version 1.1.1 (IAO33.0059.B1)
- 10 -
www.sg.com.tw www.fairchildsemi.com
September 26, 2007
Brownout Protection
Since the VIN pin is connected through a resistive
divider to the rectified AC input line voltage, it can also
be used for brownout protection. If the V
IN
voltage is
less than 0.7V, the PWM output shuts off. If the V
IN
voltage is over 0.9V, the PWM output turns on again.
The hysteresis window for ON/OFF is around 0.2V.
V
DD
Over-voltage Protection
V
DD
over-voltage protection is built-in to prevent the
controller from over-voltage destruction. When V
DD
voltage is over 23.6V, the SG6846A is latched off.
Over-Temperature Protection
An external NTC thermistor can be connected from the
RT pin to GND. The impedance of the NTC decreases
at high temperatures. When the voltage of the RT pin
drops below 1.065V, the SG6846A is turned off. For
the protection modes options, please see ORDER
INFORMATION.
Noise Immunity
Noise from the current sense or the control signal may
cause
significant
pulse
continuous-conduction mode. Slope compensation
helps alleviate this problem. Good placement and
layout practices should be followed. Avoid long PCB
traces and component leads. Compensation and filter
components should be located near the SG6846A.
Usually an RC network is put on between sensing
resistor and the CS pin to filter high-frequency
switching noise, as shown Figure 1.
jitter,
particularly
in
FIG-1 Current Sense RC Filter
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| SG6846ACSZ | Highly Integrated Green-Mode PWM Controller |
| SG6846ALSZ | Highly Integrated Green-Mode PWM Controller |
| SG6858 | Low-Cost, Green-Mode PWM Controller for Flyback Converters |
| SG6858DZ | Low-Cost, Green-Mode PWM Controller for Flyback Converters |
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| SG6846A_08 | 制造商:FAIRCHILD 制造商全稱:Fairchild Semiconductor 功能描述:Highly Integrated Green-Mode PWM Controller |
| SG6846ACSY | 功能描述:電流型 PWM 控制器 Highly Integrated Gr Mode PWM Contrl RoHS:否 制造商:Texas Instruments 開關頻率:27 KHz 上升時間: 下降時間: 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 安裝風格:SMD/SMT 封裝 / 箱體:TSSOP-14 |
| SG6846ACSZ | 制造商:FAIRCHILD 制造商全稱:Fairchild Semiconductor 功能描述:Highly Integrated Green-Mode PWM Controller |
| SG6846ALSY | 功能描述:電流型 PWM 控制器 Highly Integrated Gr Mode PWM Contrl RoHS:否 制造商:Texas Instruments 開關頻率:27 KHz 上升時間: 下降時間: 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 安裝風格:SMD/SMT 封裝 / 箱體:TSSOP-14 |
| SG6846ALSZ | 功能描述:電流型 PWM 控制器 Highly-Integrated Green-Mode PWM RoHS:否 制造商:Texas Instruments 開關頻率:27 KHz 上升時間: 下降時間: 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 安裝風格:SMD/SMT 封裝 / 箱體:TSSOP-14 |
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