DESCRIPTION
The MP4078 is an single-stage offline controller
with active power factor correction (PFC) for
constant voltage output applications. The device
implements primary-side regulation (PSR)
control without requiring a secondary feedback
circuit or optocoupler for flyback applications. It
is also available for non-isolated topologies (e.g.
buck-boost).
The device achieves ultra-low standby power
consumption. Its pulse frequency modulation
(PFM) implements a minimum operating
frequency under no-load conditions. The
MP4078 works in discontinuous conduction
mode (DCM) with valley switching for improved
efficiency performance.
The MP4078 operates in constant-on-time (COT)
mode to achieve a high power factor across the
universal input. It adopts a cascode MOSFET
technique to achieve fast start-up with few
external components.
The MP4078 integrates multiple protection
features that greatly enhance system reliability
and safety, including output over-voltage
protection (OVP), output short-circuit protection
(SCP), primary-side over-current protection
(OCP), and over-temperature protection (OTP).
The MP4078 is available in an SOIC-8 package.

FEATURES
 Primary-Side Control with Simple Design
and Minimal External Components
 Ultra-Low No-Load Power Consumption,
Typically below 50mW with 230VAC
 Good Performance on PF and THD
 Fast Transient Response
 Fast Start-Up
 Novel Control Scheme with Continuous
Peak Current Limitation
 Primary-Side Over-Current Protection
(OCP)
 Output Over-Voltage Protection (OVP)
 Output Short-Circuit Protection (SCP)
 Brownout Protection
 Thermal Shutdown
 Available in an SOIC-8 Package

APPLICATIONS
 Smart LED Lighting
 Front-End Pre-Regulators