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