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參數(shù)資料
| 型號(hào)： | SG6846CD |
| 廠商： | Electronic Theatre Controls, Inc. |
| 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)： | 3/14頁 |
| 文件大?。?/td> | 3217K |
| 代理商： | SG6846CD |
Product Specification
Highly-Integrated Green-Mode PWM Controller
SG6846
PIN DESCRIPTIONS
System General Corp. - 3 - www.sg.com.tw
Version 1.0(IAO33.0008.B0) Sep. 30, 2004
Pin No. Symbol
Function
Description
1
GND
Ground
Ground.
The signal from the external compensation circuit is fed into this pin. This FB pin and the
current-sense signal from Pin 6 determine the PWM duty cycle.
2
FB
Feedback
3
VIN
Line-voltage
Detection
Line-voltage detection. The line-voltage detection is used for brownout protection with
hysteresis. Constant output power limit over universal AC input range is also achieved using
this VIN signal. It is suggested to add low pass filter to filter out line ripple on bulk capacitor.
4
RI
Reference
Setting
A resistor from the RI pin to ground will generate a reference current source inside SG6846.
This determines the switching frequency. Increasing the resistance will reduce the switching
frequency. Using a 26k
resistor Ri results in a 65kHz switching frequency.
For over-temperature protection. An external NTC thermistor is connected from this pin to
GND pin. The impedance of the NTC will decrease at high temperatures. Once the voltage
of the RT pin drops below a threshold, PWM output will be disabled.
Current sense. The sensed voltage is used for peak-current-mode control and
cycle-by-cycle current limiting. If the switching current is higher than 2/3 of the peak-current
threshold for longer than 96ms, over-current protection will be activated. This two-level OCP
feature is especially suitable for SMPS with surge current output.
Power Supply. The internal protection circuit will disable PWM output when VDD over
voltage.
The totem-pole output driver for the power MOSFET. A soft driving waveform is
implemented for improved EMI.
5
RT
Temperature
Detection
6
SENSE
Current Sense
7
VDD
Power Supply
8
GATE
Driver Output
BLOCK DIAGRAM (OTP LATCH VERSION)
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SG6846CDSMC_DBB14 WAF | 制造商:Fairchild Semiconductor Corporation 功能描述: |
| SG6846CDZ | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Highly-Integrated Green-Mode PWM Controller |
| SG6846CLDZ | 功能描述:軟開關(guān) PWM 控制器 Highly-Integrated Green-Mode PWM RoHS:否 制造商:Fairchild Semiconductor 輸出端數(shù)量: 輸出電流: 開關(guān)頻率: 工作電源電壓:30 V 電源電流: 最大工作溫度:+ 105 C 最小工作溫度:- 40 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Reel |
| SG6846CLSZ | 功能描述:軟開關(guān) PWM 控制器 Highly-Integrated Grn Mode PWM Cntrl RoHS:否 制造商:Fairchild Semiconductor 輸出端數(shù)量: 輸出電流: 開關(guān)頻率: 工作電源電壓:30 V 電源電流: 最大工作溫度:+ 105 C 最小工作溫度:- 40 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Reel |
| SG6846CS | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Highly-Integrated Green-Mode PWM Controller |
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