MCZ5207SG

Application Note


Overview/Features

MCZ5207SG is an advanced symmetric LLC current resonant mode controller for bridge converter.
Built-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)
　■ Document equipment
　■ High power adapter
　■ CVCC high power LED lighting
　■ High power standard PSU
　■ High power Audio Amp

1. Robust 600V direct gate driver.
2. Optimized protections (OCP/burst/Timer delayed latch/Thermal) for LLC converter.
3. Bidirectional resonant current sensing.
4. Bidirectional capacitive mode protection.
5. Vcc supply up to 35V with 12.9V/8.7V UVLO.
6. Built-in voltage regulator of 10.5V for gate driver.
7. Independent UVLO for High side/Low side Gate drive VDD.
8. Safe soft starting function to prevent MOSFET didt stress.
9. Brown Out protection
10. Resonant peak current stabilized frequency clamp OLP.
11. Active stdby function to improve light load efficiency.
12. Less than 100mW no load consumption is possible with burst mode operation.
13. Latching protection with external signal is possible.


Application Note Contents

1. General description
    1.1 Features
    1.2 Internal block diagram
    1.3 Pin assignment
    1.4 Functions
    1.5 Typical circuit configuration
2. Functional description
    2.1 Operation mode
    2.2 Supply block
        2.2.1 IC supply (Vc1)
        2.2.2 Gate driver supply (Vc2)
        2.2.3 High side gate driver supply (VB)
    2.3 Functional terminal detail
        2.3.1 Gate driver output (VGH / VGL)
        2.3.2 Oscilator and Feedback (FB)
        2.3.3 Brown-out protection (Vsen)
        2.3.4 Current peak limiting fast OCP(CS1)
        2.3.5 Fequency clamped slow OLP (CS2/CSO)
        2.3.6 Capacitive mode protection (CS2)
        2.3.7 Safe startup
        2.3.8 Soft start (SST)
        2.3.9 Timer delayed latching protection (SST)
        2.3.10 High side floating VDD (VB)
        2.3.11 Active Stdby (AS)
        2.3.12 Burst mode operation (AS)
        2.3.13 Thermal shutdown
    2.4 Thermal shut down protection
3. Selecting components value
    3.1 Brown out protection (Vsen)
    3.2 Oscillator / Feedback (FB)
    3.3 Soft start / delayed protection timer (SST)
    3.4 OCP1/OCP2 and anti-capacitive mode protection
4. Circuit diagram
    4.1 DCDC Configuration example
5. Dimensions
    5.1 SOP16 (MCZ5207SG)

Example Circuits


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