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AN2844 Datasheet(PDF) 22 Page - STMicroelectronics |
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AN2844 Datasheet(HTML) 22 Page - STMicroelectronics |
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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. |
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