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AN1523 Datasheet(PDF) 10 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) 10 Page - STMicroelectronics

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AN1523 APPLICATION NOTE
10/24
Turn-Off
Even at turn off the transition is clean, without any ab-
normal behaviour like overshoots or glitches both on
the output voltages. Checking the full load condition,
a restart attempt is present on the Vcc voltage: it is
due to the circuit Q1, Q2,R9, R10, R11, C6 connect-
ed to the COMP pin. During the switching off phase
the energy in the bulk capacitor is no more refreshed,
then the voltage on it starts to decrease. This pro-
vides for an increasing of the COMP pin voltage due
to the loop intervention which is regulating the output
voltage while the input voltage is decreasing. At a
certain value the COMP voltage is able to switch on
Q1 and then Q2, thus disconnecting the transformer
from Vcc, so that the L6590 stops the operation. Be-
cause the circuit is switched off externally, the bulk
capacitor has still some energy stored and when the
Vcc has dropped below the Vccoff the IC detects that
residual input voltage higher than its Drain start volt-
age (Vdsmin). Hence the L6590 reactivates the inter-
nal current source like in a normal start-up, and the
voltage on the Vcc pin tends to increase again. But
checking the Fig. 17 it is important to note that the
Vcc value is far from the Start Threshold voltage (Vc-
con), then no any perturbation appears on the output,
avoiding any problem..
Figure 16. WAKE UP TIME
Vin = 115 Vrms - 50 Hz @FULL LOAD
CH1:
VPIN1 - DRAIN VOLTAGE
CH2:
VPIN3 -Vcc
CH3:
+5VOUT
Figure 17. TURN-OFF
Figure 18. TURN-OFF
Vin = 115 Vrms - 50 Hz @FULL LOAD
Vin = 115 Vrms - 50 Hz @STAND-BY
CH1:
VPIN1 – DRAIN VOLTAGE
CH1:
VPIN1 – DRAIN VOLTAGE
CH2:
VPIN3 - Vcc
CH2:
VPIN3 -Vcc
CH3:
+5VOUT
CH3:
+5VOUT


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