Description

The MD6751 is a fully digital-controlled power

supply IC, which incorporates a bridgeless PFC control

circuit and an LLC current-resonant circuit. The PFC

circuit, driven by continuous conduction mode (CCM),

is controlled with frequencies suitable for applied input

voltages and loads. The LLC circuit incorporates a

floating drive circuit that drives an external high-side

power MOSFET, in addition to its functionally-rich

protections such as capacitive mode detection. These

digitally controlled strategies allow application-specific

optimal settings. Compared to conventional analog

control circuits, the IC can achieve more cost-effective,

high-efficient, yet low-noise power systems with fewer

external components.

Features

● Fully Digital-controlled PFC and LLC Currentresonant Circuits

● Soft Start

● X-capacitor Discharge (No Discharge Resistor

Required)

● Bridgeless PFC Circuit

● Continuous Conduction Mode (CCM) PFC Control

● LLC Capacitive Mode Detection

● LLC Automatic Standby Mode

● Protections Include:

- AC Power Supply Input Undervoltage Lockout

- PFC Output Undervoltage Protection (PFC_UVP)

- PFC Output Overvoltage Protection (PFC_OVP)

- PFC Overcurrent Protection (PFC_OCP)

- LLC High-side Driver Undervoltage Lockout

(VB_UVLO)

- LLC Overcurrent Protection (LLC_OCP)

- LLC Overload Protection (LLC_OLP)

- VCC Pin Overvoltage Protection (VCC_OVP)

- Thermal Shutdown (TSD)

Applications

For devices requiring high power supplies such as:

● Audiovisual Equipment (e.g., LCD TV)

● Office Automation Equipment (e.g., Server,

Multifunction Printer)

● Industrial Equipment

● Communication Equipment