FAN7527B: CrCM PFC Controller

The FAN7527B provides simple and high-performance active Power Factor Correction (PFC). The FAN7527B is optimized for electronic ballasts and low–power, high-density power supplies that require minimum board size, reduced external components, and low power dissipation. Because the R/C filter is included in the current-sense block, an external R/C filter is not necessary. Special circuitry prevents no-load runaway conditions. Regardless of the supply voltage, the output drive clamping circuit limits the overshoot of the power MOSFET gate drive, which improves system reliability.

Features

• Internal Startup Timer
• Internal R/C Filter Eliminates the Need for External R/C Filter
• Precise Adjustable Output Over-Voltage Protection
• Zero Current Detector
• One Quadrant Multiplier
• Trimmed 1.5% Internal Band Gap Reference
• Under-Voltage Lockout with 3 V of Hysteresis
• Totem-Pole Output with High-State Clamp
• Low Startup and Operating Current
• 8-Pin SOP or 8-Pin DIP

Application Notes