ML4824CP1

The ML4824 controller features an average current controlled continuous boost Power Factor Corrector (PFC) front end and a synchronized Pulse Width Modulator (PWM) backend. The PWM can operate in current or voltage mode, with feedforward from the PFC output buss improving line regulation. The PWM stage uses trailing-edge duty cycle modulation, while the PFC uses leading-edge modulation. This synchronization simplifies PWM compensation due to controlled ripple on the PFC output capacitor. The device is available in two versions, ML4824-1 and ML4824-2, with different PWM frequencies. The ML4824 enables power factor correction, reduces power line loading, and complies with IEC1000-2-3 specification. The PWM section is straightforward and synchronized to the PFC section, with current-mode or voltage mode operation. The controller also includes various pins for functions such as PWM current limit, ground, PWM driver output, PFC driver output, positive supply, reference output, transconductance voltage error amplifier input and output, transconductance current error amplifier output, gain control reference input, current sense input, RMS line voltage compensation input, soft start capacitor connection, PWM voltage feedback input, and oscillator timing nodes.

The two versions of the ML4824 controller mentioned in the document are the ML4824-1 (fPWM = fPFC) and the ML4824-2 (fPWM = 2 x fPFC).

The ML4824 controller helps in reducing power line loading and stress on the switching FETs by incorporating Power Factor Correction (PFC) .