Overview The ML4800 is a power correction factor controller, switched power supply. Power Factor Correction (PFC) allows the use of small, lower cost bulk capacitors, reduces power line load and stress on switching FETs, and results in full compliance with IEC1000-3-2 specifications in the power supply. Intended as a BiCMOS version of the industry standard ML4824, the ML4800 includes a lead executive circuit, average current, "boost" type power factor correction and tail edge, and pulse width modulation (PWM). It also includes the TriFault Detection™ feature to help ensure that no unsafe conditions will result from a single component failure in the PFC. Gate-1A drive capability minimizes the need for external drive circuitry. Low power requirements increase efficiency and reduce component cost. The overvoltage comparator shuts down the PFC section during a sudden load shedding event. Part of the PFC also includes peak current limit and input voltage brownout protection. The PWM section can operate in current or voltage mode at up to 250kHz and includes an accurate 50% duty cycle limit to prevent transformer saturation.

Features internal synchronous leading edge PFC and trailingedgePWM in one IC
TriFault Detector Compliant and Compliant with UL1950 Enhanced Safety Slew Rate Enhanced Error Amplifier Transconductance Ultrafast Response PFC
Low power: 200 Ω starting current, 5.5 mA operating current, low total harmonic distortion, high CPF to reduce storage capacitor ripple current, average current between PFC and PWM section, continuous leading edge PFC boost PWM current mode or voltage mode configuration operation incumbent fed to improve noise immunity gain modulator overvoltage and undervoltage protection, UVLO and soft start