Bringing five-star stand-by to 75W mains power supplies Fairchild, has introduced a controller that cuts no-load dissipation to 30mW, including input filters.
Called FAN6756, the fly-back chip is aimed at notebooks, printers, LCD TVs and monitors.
"It includes a proprietary deep burst mode technology that reduces switching loss at no-load and light-load conditions," said the firm.
Operating frequency is 65kHz, which in 'green-mode' slides down to 23kHz at light load. Injected jitter reduces the EMI signature.
The chip has a low-dissipation X-capacitor discharge circuit branded Ax-cap "discharging X-cap energy through the HV pin when the power is unplugged from the AC outlet while still meeting the IEC61010-1 safety requirement," said Fairchild.
Proprietary sense resistor short-circuit protection shuts down the PWM output to prevent system damage if the sense resistor is shorted.
Power switching is through an external mosfet and feedback in isolated PSUs is through an opto-isolator.
The chip comes in an 8pin SOP package.