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参数资料
| 型号： | SG6841SZ3 |
| 厂商： | Fairchild Semiconductor |
| 文件页数： | 2/14页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR FLYBACK PWM 8-SOIC |
| 产品变化通告： | Mold Compound Change 12/Dec/2007 |
| 标准包装： | 2,500 |
| PWM 型： | 控制器 |
| 输出数： | 1 |
| 频率 - 最大： | 70kHz |
| 占空比： | 90% |
| 电源电压： | 10 V ~ 20 V |
| 降压： | 无 |
| 升压： | 无 |
| 回扫： | 是 |
| 反相： | 无 |
| 倍增器： | 无 |
| 除法器： | 无 |
| Cuk： | 无 |
| 隔离： | 无 |
| 工作温度： | -20°C ~ 85°C |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 包装： | 带卷 (TR) |
Product Specification
High-integrated Green-mode PWM Controller
MARKING DIAGRAMS
PIN CONFIGURATION
SG6841
T : D = DIP, S = SOP
GND
GATE
SG6841 TP
XXXXXXXYYWWV
P : Z = Lead Free
Null=regular package
XXXXXXX : Wafer Lot
YY : Year; WW : Week
V : Assembly Location
FB
VIN
RI
VDD
SENSE
RT
ORDERING INFORMATION
Part Number
SG6841S
SG6841D
SG6841SZ
SG6841DZ
PIN DESCRIPTIONS
Package
8-Pin SOP
8-Pin DIP
8-Pin SOP(Lead Free)
8-Pin DIP(Lead Free)
Pin No.
1
2
Symbol
GND
FB
Function
Ground
Feedback
Description
Ground.
The signal from external compensation circuit is feed into this pin. The PWM duty cycle is
determined by this FB pin and current sense signal from Pin 6.
This pin is pulled high to the rectified line input through a resistor for start-up. Since the
3
VIN
Start-Up Input
start-up current requirement for SG6841 is very small, a large start-up resistance can be
used to minimize power loss. Under normal operation, this pin is also used to detect line
voltage to compensate for constant output power limit for universal AC input.
A resistor from RI pin to ground will generate a constant current source forSG6841. This
current is used to charge an internal capacitor and hence the switching frequency are
4
Ri
Reference Setting
determined. Increasing the resistance will decrease the current source and reduce the
switching frequency. A 26k ? resistor R i creates a 50uA constant current I i and generates
65kHz switching frequency.
5
6
7
8
RT
SENSE
VDD
GATE
Temperature
Protection
Current Sense
Power supply
Driver Output
For over-temperature protection. An external NTC thermistor is connected from this pin
to ground. The impedance of the NTC will decrease under high temperature. Once the
voltage on RT pin drops below a fixed limit, the PWM output will be disabled.
Current sense. The sensed voltage is used for current mode control and pulse-by-pulse
current limiting.
Power Supply.
The totem-pole output driver for the power MOSFET. A soft driving waveform is
implemented to improve EMI.
?System General Corp.
Version 2.1 (IRO33.0001.B5)
-2-
www.sg.com.tw
Jun.15,2006
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相关代理商/技术参数 |
参数描述 |
|---|---|
| SG6842BLVDZ | 制造商:Fairchild Semiconductor Corporation 功能描述: |
| SG6842BLVSY | 功能描述:电流型 PWM 控制器 Current Mode PWM Controller RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
| SG6842BLVSZ | 制造商:Rochester Electronics LLC 功能描述: 制造商:Fairchild Semiconductor Corporation 功能描述: |
| SG6842JLDZ | 制造商:Fairchild Semiconductor Corporation 功能描述: |
| SG6842JLSY | 功能描述:电流型 PWM 控制器 Highly Integrated Gr Mode PWM Contrl RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
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