DESCRIPTION
The MPX2003 is an all-in-one flyback controller
with an integrated primary driving circuit,
secondary controller, synchronous rectification
driver, and safety-compliant feedback. It offers
the benefits of both primary-side regulation (PSR)
and secondary-side regulation (SSR).
A feedback circuit is not required, which reduces
system complexity and the total BOM cost. The
synchronous rectifier (SR) can match the driving
signal of the primary-side MOSFET, meaning the
SR can operate safely in continuous conduction
mode (CCM). Meanwhile, the integrated SR
controller regulates the SR MOSFET at a low
threshold, which increases the overall efficiency
and design flexibility. An internal linear regulator
is integrated for the SR power supply, so the
MPX2003 can drive the low-side SR MOSFET
without auxiliary winding, even when the output
is low.
The MPX2003 can run in CCM under heavy
loads, then operate in quasi-resonant (QR)
mode when the load decreases. If the load drops
further, the MPX2003 works in pulse-frequency
modulation (PFM) mode. The switching
frequency (fSW) is fixed at 20kHz when the device
enters burst mode, which can prevent audible
noise. The MPX2003 achieves high efficiency
under most load conditions while improving
electromagnetic interference (EMI) performance.
The MPX2003 features advanced protections,
including VCC over-voltage protection (OVP),
primary over-current protection (POCP),
secondary-sense output overload protection
(OLP), internal brown-in/brownout (B/I, B/O),
short-circuit protection (SCP), current-sense
short protection (SSP), current-sense open
protection (SOP), SR gate open/short protection
(SGOP/SGSP), SRD abnormal protection
(SRDP), FB OVP and under-voltage protection
(UVP), internal thermal shutdown, under-voltage
lockout (UVLO), and an externally triggered
protection (Ext.P).
The MPX2003 is available in SOICW-16 and
TSOICW16-15 packages.

FEATURES
• Isolation Voltage >3750VAC
• 100% Production HIPOT Compliance
Testing
• UL1577 and IEC62368 Safety Approved,
DIN VDE V 0884-17 in Process
• Integrated Multi-Mode: Discontinuous
Conduction Mode (DCM), Quasi-Resonant
(QR) Mode, and Continuous Conduction
Mode (CCM)
• Flyback Controller, Secondary-Side
Synchronous Rectifier (SR) Sensing/Driving
Circuitry, and Safety-Compliant Feedback
Link
• Integrated 650V Primary-Side Current
Source and 150V Secondary-Side Current
Source
• Less than 30mW in Standby Mode
• Improved SR Control for Reliable Operation
and Higher Efficiency
• VCC Over-Voltage Protection (OVP), Primary
Over-Current Protection (POCP),
Secondary-Sense Output Overload
Protection (OLP), Internal BrownIn/Brownout (B/O, B/I), Short-Circuit
Protection (SCP), Current-Sense Short
Protection (SSP), Current-Sense Open
Protection (SOP), SR Gate Open/Short
Protection (SGOP/SGSP), SRD Abnormal
Protection (SRDP), FB OVP and UnderVoltage Protection (UVP), Internal Thermal
Shutdown, Under-Voltage Lockout (UVLO),
and an Externally Triggered Protection
(Ext.P)
• Available in TSOICW16-15 and SOICW-16
Packages
APPLICATIONS
• High-Performance USB PD Adapters
• Offline Battery Chargers
• High Efficiency, High-Current Power
Supplies