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2022-09-24 23:33:15
SG6848 - Low cost green mode PWM controller for flyback converter
This highly integrated PWM controller offers several special enhancements designed to meet the power demands of low standby low power SMPS. To minimize standby power consumption, a proprietary green-mode function provides off-time modulation to linearly reduce switching frequency conditions at light loads. This green mode feature enables the power supply to easily meet even stringent power protection requirements. The BiCMOS fabrication process enables reducing the startup current to 5uA and the operating current to 2mA. To further improve energy saving, a large start-up resistor can be used. Built-in synchronous slope compensation ensures stable peak current mode control. Proprietary internal compensation specifies a constant output power limit range (90VAC to 264VAC) over a universal AC input. The pulsed current is limited by pulses, ensuring safe operation even in short circuits. In order to protect the external power MOSFET from damaging the power supply and overvoltage, the output driver of the SG6848 is clamped at 15V. The SG6848 controller can be used to improve performance and reduce the cost of producing power supplies. SG6848 is the best choice to replace the linear and RCC mode power adapter. This is available in 8-pin DIP and 6-pin SOT-26 packages.