SG6840

This high-integrated PWM controller provides several special enhancements to satisfy the needs for low power standby and protection features. In standby mode, PWM frequency reduction is used to lower the power consumption and support a stable output voltage. Due toBi-CMOS process, the SG6840 reduces startup andoperation current to achieve a higher efficiency power conversion. Start-up current has been reduced to 30uA typical and operating current has been shrunk to 3mA. The SG6840 is a fixed frequency PWM controller in normal operation; its patented green-mode function will decrease the PWM frequency in response to the decrease of the load. This green function dramatically reduces the power loss in no load and light load conditions that assist the power supply to meet the power conservation requirement. The proprietary synchronized slope compensationensures the stability of the current loop for continuous-mode operation. Built-in line voltage compensation maintains an identical output power for a wide input range. An NTC thermistor is applied to sense the temperature for over-temperature protection. The SG6840 is available in 8-pin DIP and SO packages.