AN1376 datasheet(9/35 Pages) STMICROELECTRONICS

部件名	AN1376

功能描述	25W QUASI-RESONANT FLYBACK CONVERTER FOR

PDF	35 Pages

Scroll/Zoom	100%

制造商	STMICROELECTRONICS [STMicroelectronics]

网页	http://www.st.com

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9 / 35 page

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AN1376 APPLICATION NOTE

Figure 6.

Vin = 115 Vrms - 50 Hz

Unplugging the output connector the circuit

is still able to maintain all the voltages per-

fectly under control and within the tolerance.

Hence a perfect functionality of the circuit is

achieved also in this abnormal condition.

During the no load operation the circuit

works in burst mode and, thanks to the con-

troller functionality, the switching frequency

inside the Burst pulses is kept at low. This

provides for a low power consumption of the

power supply, making it suitable to support

stand-by operation with low consumption

from the mains.

It has to be kept into ac-

count that this circuit has not been opti-

mized for the Stand-by operation, hence it

could be improved.

Vin = 220 Vrms - 50 Hz

CH1:

VPIN5 - ZCD

CH2:

VPIN4 - ISENSE

CH3:

VPIN7 - OUT

CH4:

VPIN2 - COMP

AN1376 数据表(PDF) 9 Page - STMicroelectronics