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參數(shù)資料
| 型號： | SG6841S |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | High-integrated Green-mode PWM Controller |
| 中文描述： | 高集成度綠色模式PWM控制器 |
| 文件頁數(shù)： | 2/14頁 |
| 文件大?。?/td> | 357K |
| 代理商： | SG6841S |
Product Specification
High-integrated Green-mode PWM Controller
SG6841
MARKING DIAGRAMS
System General Corp. - 2 - www.sg.com.tw
Version 1.7 (IRO33.0001.B1) JUL.25,2003
4
3
2
1
5
7
6
8
FB
V IN
R i
G N D
VD D
R T
Sense
G ate
PIN CONFIGURATION
ORDERING INFORMATION
Part Number
SG684
1
S
SG684
1
D
PIN DESCRIPTIONS
Package
8-Pin SOP
8-Pin DIP
Pin No. Symbol Function
Description
1
GND
Ground
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
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
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.
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. If a short circuit failure happens on current sense resistor, the SG6841
will shut off after a continuous low voltage detection on SENSE pin.
Power Supply.
The totem-pole output driver for the power MOSFET. A soft driving waveform is
implemented to improve EMI.
2
FB
Feedback
3
VIN
Start-Up
Input
4
Ri
Reference Setting
5
RT
Temperature
Protection
6
SENSE
Current Sense
7
VDD
Power supply
8
GATE
Driver Output
8
1
T
: D = DIP, S = SOP
XXXXXXX
: Wafer Lot
YY
: Year;
WW
: Week
V
: Assembly Location
SG6841
T
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相關(guān)PDF資料 |
PDF描述 |
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| SG6846LD | Highly-Integrated Green-Mode PWM Controller |
| SG6846LDZ | Highly-Integrated Green-Mode PWM Controller |
| SG6846CS | Highly-Integrated Green-Mode PWM Controller |
| SG6846CSZ | Highly-Integrated Green-Mode PWM Controller |
| SG6846LS | Highly-Integrated Green-Mode PWM Controller |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SG6841SZ | 功能描述:電壓模式 PWM 控制器 HI-INTEGRD GRN-MODE PWM CONTROLLER RoHS:否 制造商:Texas Instruments 輸出端數(shù)量:1 拓撲結(jié)構(gòu):Buck 輸出電壓:34 V 輸出電流: 開關(guān)頻率: 工作電源電壓:4.5 V to 5.5 V 電源電流:600 uA 最大工作溫度:+ 125 C 最小工作溫度:- 40 C 封裝 / 箱體:WSON-8 封裝:Reel |
| SG6841SZ3 | 功能描述:電壓模式 PWM 控制器 HI-INTEGRD GRN-MODE PWM CONTROLLER RoHS:否 制造商:Texas Instruments 輸出端數(shù)量:1 拓撲結(jié)構(gòu):Buck 輸出電壓:34 V 輸出電流: 開關(guān)頻率: 工作電源電壓:4.5 V to 5.5 V 電源電流:600 uA 最大工作溫度:+ 125 C 最小工作溫度:- 40 C 封裝 / 箱體:WSON-8 封裝:Reel |
| SG6842BLVDZ | 制造商:Fairchild Semiconductor Corporation 功能描述: |
| SG6842BLVSY | 功能描述:電流型 PWM 控制器 Current Mode PWM Controller RoHS:否 制造商:Texas Instruments 開關(guān)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(fēng)格:SMD/SMT 封裝 / 箱體:TSSOP-14 |
| SG6842BLVSZ | 制造商:Rochester Electronics LLC 功能描述: 制造商:Fairchild Semiconductor Corporation 功能描述: |
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