Fairchild Semiconductor introduces critical conduction mode (CRM) power factor correction (PFC) controller ICs specially designed to meet stringent stand-by power and harmonic regulations affecting ballast, notebook adaptors, LCD TVs and LCD monitors.
FAN7529 and FAN7530 utilise a patent-pending variable on-time control method to achieve industry-leading Total Harmonic Distortion (THD) performance (<10 percent at 25 percent load, 265Vac) for good system reliability. The FAN7529 and FAN7530 also easily meet stand-by power regulations by reducing input-voltage sensing loss to approximately 100mW.
According to Fairchild, its FAN7529 and FAN7530 PFC controllers offer designers the ideal THD performance on the market, an important consideration since government regulations specify that manufacturers must reduce harmful noise that can affect system reliability.
Fairchild uses a unique variable on-time control method based on ZCD winding voltage to achieve less than 10 percent THD at 25 percent of the full load. As a result, when designing four lamp ballasts, a designer can control THD to be less than 10 percent even if only one lamp is turned on. This low THD translates into good system performance and offers more flexibility to system designers.
Fairchild's FAN7529 and FAN7530 utilise an internal voltage-mode PWM method compared with conventional current-mode controllers requiring rectified AC-line voltage information even when the PFC IC does not operate. As a result, Fairchild's CRM PFC controllers reduce overall power loss by approximately 200mW.
Moreover, Fairchilds controllers offer a disable function to further reduce power consumption during stand-by mode, and their current-type error amplifiers enable the FAN7529 and FAN7530to use a higher Rfb (output-voltage-sensing resistor) over 1 megaohm, resulting in reduced power loss (80 milliwatts, 2 megaohms).
In addition to these PFC controllers, Fairchild also offers the FAN7528, a dual-output CRM PFC controller IC. The FAN7529 and FAN7530 add to Fairchild Semiconductors offering of discrete and IC product solutions, broad in the industry targeting switch-mode power supplies from 1W to 1500W.
FAN7529 and FAN7530 half-bridge gate drivers are available from Soanar .