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SG6848DY1 Dataheets PDF



Part Number SG6848DY1
Manufacturers Fairchild Semiconductor
Logo Fairchild Semiconductor
Description Green-Mode PWM Controller
Datasheet SG6848DY1 DatasheetSG6848DY1 Datasheet (PDF)

NOT RECOMMENDED FOR NEW DESIGNS SG6848x1 — Low Cost, Green-Mode PWM Controller for Flyback Converters SG6848x1 Low-Cost, Green-Mode PWM Controller for Flyback Converters Features  Green-Mode PWM Controller  Low Startup Current: 5 μA  Low Operating Current: 3 mA  Programmable PWM Frequency  Peak-Current-Mode Operation  Leading-Edge Blanking  Built-in Synchronized Slope Compensation  Cycle-by-Cycle Current Limiting  Constant Output Power Limit  Gate Output Voltage Clamped at 15 V  Sm.

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NOT RECOMMENDED FOR NEW DESIGNS SG6848x1 — Low Cost, Green-Mode PWM Controller for Flyback Converters SG6848x1 Low-Cost, Green-Mode PWM Controller for Flyback Converters Features  Green-Mode PWM Controller  Low Startup Current: 5 μA  Low Operating Current: 3 mA  Programmable PWM Frequency  Peak-Current-Mode Operation  Leading-Edge Blanking  Built-in Synchronized Slope Compensation  Cycle-by-Cycle Current Limiting  Constant Output Power Limit  Gate Output Voltage Clamped at 15 V  Small SSOT-6 Package Applications General-purpose switched-mode power supplies (SMPS) and flyback power converters, such as:  Battery chargers for cellular phones, cordless phones, PDAs, digital cameras, and power tools  Power adapters for ink jet printers, video game consoles, and portable audio players  Open-frame SMPS for TV/DVD standby and auxiliary supplies, home appliances, and consumer electronics  Replacements for linear transformers and RCC SMPS  PC 5 V Standby Power Description This highly integrated PWM controller provides several enhancements to meet the low standby-power needs of low-power SMPS. To minimize standby power consumption, the proprietary Green Mode provides offtime modulation to continuously decrease PWM frequency under light-load conditions. Green Mode enables the power supply to meet even strict power conservation requirements. The BiCMOS fabrication process enables reducing the startup current to 5 μA and the operating current to 3 mA. As a result, a large startup resistance can be used. Built-in synchronized slope compensation ensures the stability of peak-current-mode control. Proprietary internal compensation provides a constant output power limit over a universal AC input range (90 VAC to 264 VAC). Cycle-by-cycle current limiting ensures safe operation during short-circuits. To protect the external power MOSFET from damage by supply over voltage, the SG6848X1 output driver is clamped at 15 V. The SG6848X1 controllers can be used to improve the performance and reduce the production cost of power supplies. The SG6848X1 can replace linear and RCC power supplies. It is available in DIP-8 and SSOT-6 packages. Ordering Information Part Number Operating Temperature Range Package SG6848TZ1 -40 to +105°C 6-Lead, SUPERSOT™-6, JEDEC MO-193, 1.6 mm Wide SG6848DZ1 -40 to +105°C 8-Lead, MDIP, JEDEC MS-001, .300" Wide, Two Dap SG6848DY1 -40 to +105°C 8-Lead, MDIP, JEDEC MS-001, .300" Wide, Two Dap Packing Method Tape & Reel Tube Tube © 2007 Fairchild Semiconductor Corporation SG6848x1 • Rev. 2, Feb-2020 www.fairchildsemi.com SG6848x1 — Low-Cost, Green-Mode PWM Controller for Flyback Converters Application Diagram NOT RECOMMENDED FOR NEW DESIGNS Figure 1. Typical Application Internal Block Diagram © 2007 Fairchild Semiconductor Corporation SG6848x1 • Rev. 2, Feb-2020 Figure 2. Functional Block Diagram 2 www.fairchildsemi.com SG6848x1 — Low-Cost, Green-Mode PWM Controller for Flyback Converters Marking Information NOT RECOMMENDED FOR NEW DESIGNS XXX: AAH=SG6848x1 TT : Die Run Code . . . : Year Code - - - : Week Code *Marking for SG6848TZ1 (Pb-free) T: D=DIP P: Z= Lead Free + RoHS Compatible Null=Regular Package XXXXXXXX: Wafer Lot Y: Year WW: Week V: Assembly Location *Marking for SG6848DZ1 (Pb-free) DZXXYYTTTT 6848 TPM F- Fairchild Logo Z- Plant Code X- 1-Digit Year Code Y- 1-Digit Week Code TT: 2-Digit Die Run Code T: Package Type (D=DIP) P: Z: Pb-free, Y: Green Package M: Manufacture Flow Code *Marking for SG6848DY1 (Green Compound) Figure 3. Top Mark © 2007 Fairchild Semiconductor Corporation SG6848x1 • Rev. 2, Feb-2020 3 www.fairchildsemi.com SG6848x1 — Low-Cost, Green-Mode PWM Controller for Flyback Converters Pin Configurations NOT RECOMMENDED FOR NEW DESIGNS Figure 4. SSOT-6 Pin Configuration Figure 5. DIP-8 Pin Configuration Pin Definitions DIP Pin # 1 2 3 4 5 6 7 8 SSOT Pin # Name Description 6 GATE The totem-pole output driver for driving the power MOSFET 5 VDD Power supply NC No connection Current sense. This pin senses the voltage across a resistor. When the voltage reaches 4 SENSE the internal threshold, PWM output is disabled. This activates over-current protection. This pin also provides current amplitude information for current-mode control. A resistor connected from the RI pin to ground generates a constant current source used to charge an internal capacitor and determine the switching frequency. Increasing 3 RI the resistance reduces the amplitude of the current source and the switching frequency. A 95 kΩ resistor, RI, results in a 50 μA constant current, II, and a 70 kHz switching frequency. NC No connection Feedback. The FB pin provides the output voltage regulation signal. It provides 2 FB feedback to the internal PWM comparator, so that the PWM comparator can control the duty cycle. 1 GND Ground © 2007 Fairchild Semiconductor Corporation SG6848x1 • R.


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