AN2844 datasheet(22/37 Pages) STMICROELECTRONICS

No. de pieza	AN2844

Descripción Electrónicos	15 W wide range SMPS for metering

PDF	37 Pages

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Fabricante Electrónico	STMICROELECTRONICS [STMicroelectronics]

Página de inicio	http://www.st.com

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22 / 37 page

Functional check

AN2844

22/37

5.2

Power-down

Figure 21 shows the reaction of the board when it is unplugged from the mains. The output

voltage as well as the auxiliary self-supply voltage have clear transitions with no glitches or

restart trials.

Figure 21.

Power-down at 125 VDC

5.3

Short-circuit tests

The following figures depict the board’s behavior when a short circuit occurs on the output

connector. Throughout the duration of a short-circuit condition, the output voltage is sensed

through logic circuits which contain Q6 and Q7 and the L6565 driver is shut down through

pin 5. Once all the energy from the C9 capacitor has been discharged, a logical stop reacts

on the output voltage and the board starts to operate normally. If the short-circuit condition

persists, the whole cycle repeats until the short-circuit condition stops. When a short-circuit

connection is removed, the converter starts to operate normally again.

AN2844 Datasheet(PDF) 22 Page - STMicroelectronics