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AN4130 Datasheet(PDF) 14 Page - STMicroelectronics

Part # AN4130
Description  LED driver using the HVLED815PF
PDF  41 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN4130 Datasheet(HTML) 14 Page - STMicroelectronics

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Power converter performance
AN4130
14/41
Doc ID 023315 Rev 1
3
Power converter performance
3.1
LED current vs. line voltage and load voltage
Nominal (18 LEDs) voltage is 54-56 V. Performance is excellent over a very wide range of
load conditions, even with the AC injection.
3.2
Efficiency and power dissipation
As expected, efficiency drops off at low voltage. The rather high RDS(on) of the
HVLED815PF and the input filter series resistances increase I2R loss due to higher required
input current.
Figure 19.
LED current vs. line voltage with 18
series LED load
Figure 20.
LED current vs. LED voltage at
120 V In
Figure 21.
Efficiency vs. line voltage
Figure 22.
Power loss vs. line voltage



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