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AN4130 Datasheet(PDF) 17 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) 17 Page - STMicroelectronics

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AN4130
Power converter performance
Doc ID 023315 Rev 1
17/41
3.7
Component stress
3.7.1
Thermal
The unit was mounted above the bench in free air with the narrow end (AC input) down.
Temperatures were recorded after 45 minutes of operation.
The dimmed temperatures were taken with a Triac dimmer feeding the unit. The dimmer was
adjusted to the point where the power analyzer reported greatest loss. Undimmed input
voltage was 120 Vrms. Dimmed input voltage was 108 Vrms, and conduction angle about
150 degrees.
Table 1.
Component thermal stress
Thermal stress
Undimmed
Dimmed
Efficiency
87.6%
85.7%
Power loss
1.41 W
1.56 W
Ambient
23.9c
24.9c
R1
36.7c
50.3c
R2
50.8c
73.2c
BR1
46.6c
50.6c
L2
42.1c
46.6c
U1
66.5c
78.1c
T1
56.3c
60.2c
D3
56.2c
58.7c
C11
41.9c
43.8c



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