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MCZ5303SG, MCZ5303SH Application Manual Vol. 1.0

5RE-125294-2

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4-3. GND Terminal (pin3)

This is a GND terminal for IC.

Connect it with the control GND of the main control IC.

4-4. COMPin Terminal (pin4) and COMPout Terminal (pin5)

The COMPin terminal is a comparator input terminal for burst control.

To operate it in indirect control, detect the Vcc winding rectified voltage on the primary side with voltage

divider and connect it to the COMPin terminal. Voltage supply to KVc1 is controlled according to the state

of the COMPin terminal (in burst mode). Connect KVc1 to Vcc(Vc1 terminal of MCZ5205 and MCZ5207)

of the LLC controller.

In normal mode, COMPin input becomes ineffective and the output voltage is continuously supplied to the

KVc1 terminal.

In burst mode (STBY: Open)

COMPin terminal input

threshold voltage

Operation

COMPout terminal

Upper limit of 1.06V

Converter operation stop (KVc1 supply stop)

Open

Lower limit of 0.96V

Converter operation start(KVc1 supply start)

Short (Lo)

The LLC controller repeats start and stop in burst duration as shown in Figure 6, set the voltage divider to

be connected to the COMPin terminal in a way that KVc1 supply start voltage setting should be equal to

the start voltage Vc1(start) of the LLC controller or more. In the case of MCZ5303SG, the COMPout

terminal is open drain, and the burst duration can be adjusted by connecting a resistor between the

COMPout and the COMPin terminal.

LLC IC_SS: Soft start signal of LLC part

Figure 6. Burst operation sequence drawing (MCZ5303SG)

KVc1

LLC MOS_ ID

LLC IC_ SS

Vo

COMPin

Vc1(start)

1.06V

0.96V