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AN1842 Datasheet(PDF) 10 Page - STMicroelectronics |
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AN1842 Datasheet(HTML) 10 Page - STMicroelectronics |
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10 / 17 page  AN1842 APPLICATION NOTE 10/17 Figure 19. Short circuit on 12V @90 VAC - 60Hz - full load Figure 20. Short circuit on 12V @265 VAC - 50Hz - full load Short Circuit Protection @ Low Load After the full load tests, some checks on the short circuit protection with reduced loads have been done, as reported here following. The tests have been done even at minimum and maximum input voltage with the same results, as the previous tests. @Half Load The waveforms of figure 21 are relevant to a short circuit test simulating a fault during normal opera- tions of the equipment, with a consumption halved with respect to the maximum output power levels (I+12V = 2A, I+5V = 1A). – At Vin = 90Vac: shorting each output the over current protection works correctly, providing for the hiccup mode. – At Vin = 265Vac: the circuit behaves correctly. Figure 21. Short circuit on 5V @265 VAC - 50Hz - half load @Reduced Load This condition simulates a fault during an operat- ing transition of the equipment, with the backlight off and a reduced consumption of the other output (I+12V = 0A, I+5V = 0.5A). – At Vin = 90Vac: shorting each output the over current protection works correctly, providing for the hiccup working mode. – At Vin = 265Vac: the behaviour of the circuit is correct like at 90Vac. – @Standby This condition simulates a fault during the standby operation of the equipment, with the backlight and the scaler off, and the µP working with a reduced consumption (I+12V = 0A, I+5V = 33mA). – At Vin = 90Vac: shorting each output the over- current protection works correctly, providing for the hiccup working mode. – At Vin = 265Vac: the behaviour of the circuit is correct like at 115Vac. CH1: VQ4 - Drain CH2: VPIN8 (Vcc) CH4: +12V short circuit current CH1: VQ4 - Drain CH2: VPIN8 (Vcc) CH4: +12V short circuit current CH1: VQ4 - Drain CH2: VPIN8 (Vcc) CH4: +5V short circuit current |
Similar Part No. - AN1842 |
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Similar Description - AN1842 |
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