Maker : ETC
Part No. : SG6846

  Datasheet PDF : SG6846.pdf
  Cross Reference : SG6846 Cross Reference
  Buy Component : SG6846 Find Stock and Price

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Product Information

Product Specification Highly-Integrated Green-Mode PWM Controller SG6846 the switching frequency under light-load conditions. Under zero-load conditions, the power supply enters burst-mode. This completely shuts off PWM output. The output restarts just before the supply voltage drops below the UVLO lower limit. This green-mode function enables power supplies to easily meet international power conservation requirements. The SG6846 is especially designed for SMPS with surge-current output. It is incorporated with a two-level OCP function. Besides the cycle-by-cycle current limiting, if the switching current is higher than 2/3 of the peak-current threshold for a delay time, over-current protection will be activated such that the SG6846 will be totally shutdown. Other protection functions include: AC input brownout protection with hysteresis, and VDD over-voltage protection. For over-temperature protection, an external NTC thermistor can be applied to sense the ambient temperature. When OCP, VDD OVP, or OTP are activated, an internal latch circuit is used to latch-off the controller. The latch will reset when the VDD supply is removed. Other features of this controller include: Built-in synchronized slope compensation, proprietary internal compensation for constant output power limit over universal AC input range. Also, the gate output is clamped at 18V to protect the external MOSFET from over-voltage damage. The SG6846 series controllers are available in both 8-pin DIP and SO packages. FEATURES Two-level OCP with 96mS delay time Peak-current-mode operation with cycle-by-cycle current limiting PWM frequency continuously decreasing w/ burst mode at light loads Low start-up current (8uA) Low operating current (3.7mA) VDD over-voltage protection (OVP) www.DataSheet4U.com AC input brownout protection with hysteresis Programmable over-temperature protection (OTP) Constant power limit over universal AC input range Internal latch circuit for OTP, OVP, OCP Very few external components APPLICATIONS General-purpose switch mode power supplies and flyback power converters, including: Power adapters Open-frame SMPS Specifically fit for SMPS with surge-current output, such as for printers, scanners, motor drivers, etc. DESCRIPTION The highly integrated SG6846 series of PWM controllers provides several features to enhance the performance of flyback converters. To minimize standby power consumption, a proprietary green-mode function provides off-time modulation to continuously decrease TYPICAL APPLICATION © System General Corp. Version 1.0(IAO33.0008.B0) -1- www.sg.com.tw Sep. 30, 2004 Product Specification Highly-Integrated Green-Mode PWM Controller SG6846 PIN CONFIGURATION MARKING DIAGRAMS 8 F: L = OTP Latch C = Hysteresis OTP T: D = DIP, S = SOP SG6846FTP MXXXXXXYYWWV P: Null = regular Z = Lead free M: Mask version XXXXXX: Wafer Lot YY: Year; WW: Week V: Assembly Location GND FB VIN RI 1 2 3 4 8 7 6 5 GATE VDD SENSE RT www.DataSheet4U.com 1 ORDERING INFORMATION Part Number SG6846LS SG6846LD SG6846CS SG6846CD SG6846LSZ SG6846LDZ SG6846CSZ SG6846CDZ Package 8-Pin SOP 8-Pin DIP 8-Pin SOP 8-Pin DIP 8-Pin SOP (Lead Free) 8-Pin DIP (Lead Free) 8-Pin SOP (Lead Free) 8-Pin DIP (Lead Free) OTP Mode Latch off Latch off Hysteresis Hysteresis Latch off Latch off Hysteresis Hysteresis © System General Corp. Version 1.0(IAO33.0008.B0) -2- www.sg.com.tw Sep. 30, 2004 Product Specification Highly-Integrated Green-Mode PWM Controller SG6846 PIN DESCRIPTIONS Pin No. Symbol 1 2 GND FB Function Ground Feedback Line-voltage Detection Reference Setting Temperature Detection Description 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. 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 si...

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