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AN1523 Datasheet(PDF) 9 Page - STMicroelectronics

Part # AN1523
Description  11W FLYBACK CONVERTER FOR AUXILIARY POWER SUPPLY APPLICATION USING THE L6590
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN1523 Datasheet(HTML) 9 Page - STMicroelectronics

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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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