MCZ5216ST

Application Note


Overview/Features

MCZ5216ST is a frequency modulation type current resonance power supply control IC.
Equipped with a high voltage self-start terminal (drain kick function) with a withstand voltage of 600V, enabling lossless start-up. In addition, it has a high-voltage gate driver and can directly drive the high-side MOSFET.
It is realizable that standby power can be further reduced as X-capacitor discharge resistance can be expelled by an X-capacitor discharge function. And equipped with two types of input detection modes enables either AC input or LLC section input after bridge Diode rectification (X capacitor discharge function supports only AC input.)
In addition, various protection functions such as overcurrent protection function and out-of-resonance protection (Capacitive Mode Protection) function are provided, which can reduce the number of components and also can realize high efficiency.
Equipped with standby power improvement function during standby (active standby function, burst function), it is maintainable for the power supply by high efficiency through the entire load range, so it is matched with the following products.

　■ Power Supply for Large Flat Screen TV like LED/Organic-EL
　■ Power Supply for OA Equipment like Lasor Printer
　■ Power Supply for External device like AC Adaptor
　■ Industrial Machinery Power Supply
　■ Isolated LED Lighting Power Supply
　■ Power Supply for Audio, and Projector

  1. 　Equipped with a self-starting terminal of a withstand voltage(600V) , and achieved lossless starting.
  2. 　Built-in 600V withstand voltage gate driver that boasts high reliability, and it enables high-side MOSFET also to drive directly.
  3. 　Equipped with X-capacitor discharge function to reduce discharge resistance loss.
  4. 　Due to equipped with input detection mode for AC & DC, various input voltage detection is possible.
  5. 　Power good signal enables transmission of IC operating status via photocoupler (AC input detection mode)
  6. 　Equipped with various protection functions required for LLC converter (Overcurrent, timer latch, undervoltage, overheat-protection)
  7. 　Equipped with overcurrent protection function by direct detection of resonance current in both positive & negative directions.
  8. 　Equipped with capacitive mode protection function by direct detection of the resonance current in both positive & negative directions.
  9. 　Support a wide range of input voltages by Vc1 withstand voltage (35V).
  10.  Built-in regulator(Vc2) for MOSFET drive power supply realizes stable drive.
  11.  Independent low-voltage protection (UVLO) for high-side and low-side gate outputs.
  12.  Equipped with soft start function to reduce di/dt stress of MOSFET
  13.  Equipped with a safe protection that stops operation during low-input-voltage operation such as Brown Out.
  14.  Equipped with an input voltage correction function in the overcurrent protection function of frequency clamp type corresponging to the peak load, the stress can be reduced during over-load by reducing the dependency of the overcurrent protection operation start points due to input voltage.
  15.  By switching the timer charge current in two stages during OCP2 operation, the protection is achieved during over load and safety operation of several 100ms at peak load.
  16.  Equipped with an active standby function to improve efficiency at light load.
  17.  Equipped with a high-efficiency burst function to improve efficiency during standby load.
  18.  Further improvement of standby efficiency is realized by the built-in fss input correction function during burst (DC input detection mode).
  19.  Equipped with immediate latch stop function (SST terminal) by external signal.
  20.  Equipped with Vc1 OVP function (immediate latch stop)
  21.  500kHz operation is possible by introducing control suitable for higher frequency.


Application Note Contents

1. General Discription
    1.1 Features
    1.2 Internal Block Diagram
    1.3 Pin Assignment
    1.4 Function List for each Pin
2. Discription of Basic Operation
    2.1 Control Method of each Operation
        2.1.1 Input-Output Detection Mode
        2.1.2 Oscillator Control Method and operation Mode
        2.1.3 HV startup
    2.2 AC Input/Output Voltage Detection Mode
        2.2.1 Power Supply(AC Input/Output Detection Mode)
        2.2.2 X Cap discharge / Input voltage detection (LS, Vsen Terminals)
    2.3 DC Input Voltage Detection Mode Operation
        2.3.1 Power Supply(DC Input Detection Mode)
    2.4 Each Mode common Terminal Operation
        2.4.1 Gate Driver Output(VGL and VGH terminals)
        2.4.2 Oscillation Control (FB terminal)
        2.4.3 Over-Current-Protection (CS and CSO terminal)
        2.4.4 Input Voltage Correction of OCP2 (CS terminal)
        2.4.5 Soft-Start, di/dt Protection at startup, Latch-Stop (SST pin)
        2.4.6 High-Side-Driver Power Supply(VB terminal)
        2.4.7 Light-Load-Area-loss Improvement(ASTBY, Burst terminal)
            2.4.7.1 Active Standby Function
            2.4.7.2 Burst Function
        2.4.8 Thermal shutdown Protection(TSD function)
        2.4.9 Over-Voltage-Protection of Vc1 (Vc1 OVP function)
    2.5 Reference
3. Peripheral Circuit Constants Setting
    3.1 Input monitoring section design in AC input voltage detection mode
          (LS, Vsen pin)
    3.2 Input monitor design in DC input voltage detection mode
    3.3 Oscillation Control (FB terminal)
    3.4 Timer charge-time adjustment at soft start and abnormality (SST terminal)
    3.5 Over-Current-Protection (OCP & di/dt), Adjustment (CS & CSO terminal)
    3.6 Circuit Constants Setting when using Active Standby
    3.7 Circuit Constants Setting when using Burst
4. Pattern layout of peripheral of IC
    4.1 Caution of pattern layout of peripheral of IC
5. Circuit Examples
    5.1 Basic Circuit
6. Dimension
    6.1 SOP18 (MCZ5216ST)

Example Circuits


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