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ML4827CP-1-ML4827IP-2
Fault-Protected PFC and PWM Controller Combo
Features Pin-compatible with industry-standard ML4824-1 TriFault Detect™ to conform to UL1950™ requirements Available in 50% or 74% max duty cycle versions Low total harmonic distortion Reduces ripple current in the storage capacitor between
the PFC and PWM sections Average current, continuous boost leading edge PFC High efficiency trailing-edge PWM can be configured for
current mode or voltage mode operation Average line voltage compensation with brown-out
control PFC overvoltage comparator eliminates output
“runaway” due to load removal Current fed gain modulator for improved noise immunity Overvoltage protection, UVLO, and soft start
General DescriptionThe ML4827 is a controller for power factor corrected,
switched mode power supplies, that includes circuitry
necessary for conformance to the safety requirements of
UL1950. A direct descendent of the industry-standard
ML4824-1, the ML4827 adds a TriFault Detect™ function to
guarantee that no unsafe conditions may result from single
component failure in the PFC. Power Factor Correction
(PFC) allows the use of smaller, lower cost bulk capacitors,
reduces power line loading and stress on the switching FETs,
and results in a power supply that fully complies with
IEC1000-3-2 specification. The ML4827 includes circuits
for the implementation of a leading edge, average current,
“boost” type power factor correction and a trailing edge,
pulse width modulator (PWM). The device is available in
two versions; the ML4827-1 (Duty CycleMAX = 50%) and
the ML4827-2 (Duty CycleMAX = 74%). The higher
maximum duty cycle of the -2 allows enhanced utilization of
a given transformer core’s power handling capacity. An over-
voltage comparator shuts down the PFC section in the event
of a sudden decrease in load. The PFC section also includes
peak current limiting and input voltage brown-out
protection. The PWM section can be operated in current or
voltage mode, and includes a duty cycle limit to prevent
transformer saturation.
