Fairchild FAN7688 advanced PFM controller now at Mouser

The Fairchild FAN7688 advanced PFM controller employs Fairchild's charge current control technology, enabling the controller to use current-mode control opposed to voltage mode control. Using a triangular waveform, the oscillator on the FAN7688 is combined with the integrated switch current information to determine switching frequency. This advanced technique offers better control-to-output transfer functionality of the power stage, which not only helps simplify the feedback loop design, but also allows true input power limit capabilities. A closed-loop soft-start on the FAN7688 permits a monotonic rising of the output voltage regardless of load condition. The efficiency of the FAN7688 is rated up to 97 per cent (typical) for a 400V input/12V output power supply.

The FAN7688 controller's comprehensive set of protection functions also help in providing its best-in-class efficiency when it comes to isolated DC/DC converters. These features include over-load protection (OLP), over-current protection (OCP), output-short protection (OSP), over-voltage protection (OVP), over-temperature protection (OTP), and NON zero-voltage switching prevention (NZS).

Fairchild's FAN7688 advanced PFM controller is available now at Mouser Electronics in a 16-pin, SOP package, has a wide operating frequency spanning 36-690kHz, and works over a temperature range from -40 to +125degC. The controller is well suited for a variety of applications, including desktop servers, telecom power supplies, intelligent off-line power supplies, high-efficiency DC/DC converters, industrial power and large screen display power.

In addition, the FAN7688 is supported by two evaluation boards, the FEBFAN7688_I00250A and the FEBFAN7688SJXA_CP14U306, also available from Mouser Electronics. Please follow the link to learn more about the FAN7688 advanced pulse frequency modulated (PFM) controller.