PFC controller integrates functionality to simplify design
July 02, 2010 // Paul Buckley
Fairchild Semiconductor is introducing an active PFC controller for boost Power Factor Correction (PFC) applications that operate in critical conduction mode (CRM)
The FAN7930 is ideal for LCD and PDP TV applications, as well as for applications using less than 200 W where PFC is mandated, including Class C lighting equipment greater than 25 W, and Class D PC, TV and monitors greater than 75 W.
The PFC controller uses a voltage-mode PWM which compares an internal ramp signal to the error amplifier output, resulting in a MOSFET turn-off signal. Because the voltage-mode CRM PFC controller does not need rectified AC line voltage information, it saves the power loss of an input voltage sensing network necessary for a current-mode CRM PFC controller.
Packaged in an 8-pin SOP, the FAN7930 includes a PFC-ready pin which can be used to trigger the next power stages, as an example in the LLC conversion stage, when PFC output voltage reaches the proper level with hysteresis. Also in the next power stage, the PFC-ready pin eliminates the need for an external circuit for PFC under-voltage lockout (UVLO) while reducing power loss.
The FAN7930 also includes a maximum switching frequency limitation and stable operating at the abnormal condition such as high noise and current. The AC Absent Detection function increases system reliability during the fast AC On-Off Test or in the event of a short electric power failure.
Additionally, the device provides soft-start and overshoot-less functions, reducing voltage and current stress at start-up while eliminating audible noise from unwanted over-voltage protection (OVP) triggering.
Availability and Pricing
Samples of FAN7930 are available now priced at 1.00 US Dollars in 1,000 quantity pieces.
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