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AN2690 Datasheet(PDF) 19 Page - STMicroelectronics

Part # AN2690
Description  This application note describes the characteristics and the features
PDF  31 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN2690 Datasheet(HTML) 19 Page - STMicroelectronics

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AN2690
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Figure 20.
Flyback open loop - restart option 230 Vac 50 Hz - half load
Table 3 gives the output voltage at OVP intervention. The measures therefore demonstrate
that, as previously explained, the L6566A sensing technique provides a very stable OVP
intervention threshold over the entire mains voltage and load ranges.
Table 3.
Output voltage at OVP intervention vs. input voltage and output power
Input voltage
Output power
Output voltage at OVP intervention
115 V
75 W
20.21 V
115 V
35 W
20.19 V
115 V
0 W
20.21 V
230 V
75 W
20.22 V
230 V
35 W
20.20 V
230 V
0 W
20.22 V
CH1: VFF voltage
CH2: Vcc
CH3: ZCD voltage
CH4: Output voltage



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