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AN1523 Datasheet(PDF) 9 Page - STMicroelectronics |
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AN1523 Datasheet(HTML) 9 Page - STMicroelectronics |
9 / 24 page ![]() 9/24 AN1523 APPLICATION NOTE Figure 13. START-UP BEHAVIOUR Figure 14. START-UP BEHAVIOUR Vin = 115 Vrms - 50 Hz @FULL LOAD Vin = 220 Vrms - 50 Hz @FULL LOAD CH3: +5VOUT CH3: +5VOUT CH4: +12VOUT CH4: +12VOUT Wake-up time In the following picture (Figure 16), there are the waveforms with the wake-up time measured at 115V input mains. Thanks to the L6590 internal current source, the capacitor C2 is charged with a constant current, independent from the input mains value. This means that the power supply wake-up time is perfect- ly constant. Thus, the annoying problem of a very long start-up time, especially at low mains, is solved without adding any additional extra component. Be- sides, it is a key feature during stand-by operation be- cause it is disconnected from the mains helping a lot the power consumption decreasing. The measured time in Figure 16 at 115Vac is less than 150ms but it doesn’t show variations from 88 to 265 Vac. The traces shown in Figure 16 are the drain voltage, the Vcc and the +5V output: on the picture is clearly visible that no overshoots, undershoots, dips or any lost of control happens during the power supply start- up phase and the circuit starts correctly overall the in- put mains range Figure 15. START-UP BEHAVIOUR Vin = 115 Vrms - 50 Hz @STAND-BY CH3: +5VOUT CH4: +12VOUT |
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Similar Description - AN1523 |
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