Renesas Unveils Interleaved CCM PFC Control IC

Embarking as the first critical conduction mode (CCM) power factor correction (PFC) control IC that employs interleaved operation, the R2A20112 promises to improve performance levels of ac-input power supplies. The device uses two signals, master and slave, for control, allowing critical mode PFC control with interleaved operation that reduces variations in operating timing. The slave control circuit allows precise current distribution, making it possible to reduce the size of components such as the input filter, step-up coil, and input/output capacitors. The chip also includes a zero-current switching (ZCS) function that causes the power MOSFET to switch at the exact moment that no current is flowing. This reduces the device's heat emission and allows for a smaller heat sink. The combination of ZCS and interleaved operation prevents the flow of redundant currents such as step-up-diode recovery current. Available in the first quarter of 2007, sample pricing for either the R2A20112SP in a SOP-16 or the R2A20112DD in a DILP-16 is 1$ each. RENESAS TECHNOLOGY AMERICA INC., San Jose, CA. (408) 382-7407.