MCZ5203SE

Application Note


Overview/Features

MCZ5203 is an advanced symmetric LLC current resonant mode controller for bridge converter.
Bulit-in high voltage direct gate drivers, control circuit and optimized protections allow simplified and space/cost-saving design of power supplies for :

　■ Large screen flat panel TVs (PDP / LCD ) PSU
　■ Laser printer PSU
　■ High power adapters

1.　Robust 600V gate driver directly drives high side Switch.
2.　Optimized gate drive capability minimizes the number of components for gate drive circuit.
3.　Optimized protective functions (OCP/burst/Timer delayed latch/Thermal) for LLC converter
4.　Advanced ZVS boundary chaser (capacitive mode protection) eliminates below resonant (capacitive di/dt) operation.
5.　OCP operates by detecting peak primary current with 0.345V / threshold.
6.　Vcc supplies up to 35V with 13.5V/8.4V UVLO
7.　Built-in voltage regulator of 10V for gate driver
8.　Independent high side / low side Gate driver UVLO with hysteresis
9.　Adjustable soft starting function
10. Anti-di/dt startup function eliminates improper startup of Non ZVS operation
11. Optimized brown out protection


Application Note Contents

1. General description
    1.1 Features
    1.2 Block diagram (SOP22)
    1.3 Pin assignment
    1.4 Functions
    1.5 Application circuits
2. Symmetric LLC converter Operating description
    2.1 Features
    2.2 Fundamental circuitry
    2.3 Operating waveform example
    2.4 Control characteristics
    2.5 Major parameters and components
    2.6 IC operation
3. Selecting peripheral components
    3.1 Oscillator (Rt)
    3.2 Vsense brown-out protection (RvsenseL)
    3.3 Soft start (Css)
    3.4 OCP (Rocpdet/RocpL)
    3.5 di/dt protection
    3.6 Timer latch protection (CTimer)
    3.7 High side floating Vcc (VB)
    3.8 Gate driver
4. Circuit diagram
    4.1 Typical circuit example
5. Dimensions
    5.1 SOP22 (MCZ5203SE)

Example Circuits


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