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MCZ5303SG Arkusz danych(PDF) 11 Page - Shindengen Electric Mfg.Co.Ltd

Numer części MCZ5303SG
Szczegółowy opis  Starter IC with High-Efficiency Burst Function
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Producent  SHINDENGEN [Shindengen Electric Mfg.Co.Ltd]
Strona internetowa  http://www.shindengen.co.jp/
Logo SHINDENGEN - Shindengen Electric Mfg.Co.Ltd

MCZ5303SG Arkusz danych(HTML) 11 Page - Shindengen Electric Mfg.Co.Ltd

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Confidential
MCZ5303SG, MCZ5303SH Application Manual Vol. 1.0
5RE-125294-2
– 11 –
4-10. Vw Terminal (pin13)
The Vw terminal inputs voltage in which output from the Vcc winding is rectified. The maximum input
voltage of the Vw terminal is 35V. It is connected from the Vw terminal to the Vcc terminal with an 18.5V
dropper circuit and a Vw switch.
When oscillation of the LLC is started and the Vw terminal voltage is increased to (Vcc+1V) or more at the
time of start, the start circuit stops. When the Vw terminal voltage decreases to 7.5V or below, the start
circuit starts operation.
Since the maximum allowable current of the Vw terminal is 200mA, the current should be limited with
resistance, etc., in consideration of charging to Cvcc when the KVc1 SW is on.
VW terminal input threshold
voltage
Operation
(Vcc+1V) or more
Start circuit stop
7.5V or less
Start circuit operation start
4-11. Vin Terminal (pin16)
The Vin terminal is a terminal to supply a current from the rectified high voltage part to Vcc at the time of
power supply start and consists of a high withstand voltage switch and a constant current circuit. The
supply current is 14.5mA with Vin=100VDC. When Vcc is 1V, it is reduced to 2.7mA.
Operation of the high withstand voltage switch is controlled by the above-mentioned VW terminal. When
the high withstand voltage switch is turned on at the time of start, charging to the Vcc terminal capacitor is
started and continued until the Vcc terminal voltage is clamped to 17V. The high withstand voltage switch
is turned off when the LLC converter oscillates and the voltage of the Vw terminal becomes Vcc+1V or
more with supply from the primary Vcc winding.
Figure 9 is a start/stop sequence drawing in burst mode.
Figure 9. Start/stop sequence drawing in burst mode (MCZ5303SG)


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