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AN4129 датащи(PDF) 31 Page - STMicroelectronics

номер детали AN4129
подробное описание детали  STEVAL-ILL044V1: 9 W Triac dimmable, high power factor
PDF  39 Pages
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производитель  STMICROELECTRONICS [STMicroelectronics]
домашняя страница  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN4129 датащи(HTML) 31 Page - STMicroelectronics

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AN4129
Circuit description and design guidance
Doc ID 023314 Rev 1
31/39
The unit produces usable light in about 0.1 seconds, and nearly full output in about 0.2
seconds. The vast majority of the startup time is the charging of the output filter capacitor
(C11) to the LED threshold voltage - reduced startup time can be traded off against
increased LED ripple current if faster startup is required.
4.16
Component stress
4.16.1
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 the greatest loss. Undimmed input
voltage was 121 V. Dimmed input voltage was 115 Vrms, conduction angle about 150
degrees. Efficiency measured 85.4%, loss measured 1.667 W.
4.16.2
Electrical
The scope image below was taken at 120 V input with an 18 LED load. The trigger was set
to pick up only the highest voltage, which occurs near the peak of each half cycle.
Table 1.
Temperatures after 45 minutes in free air
Measured point
Undimmed
Dimmed
Ambient
23.5
23.4
R1
41.5
50.3
R2
38.9
51.3
BR1
38.1
48
L2, L3
43
46.4
U1
58.7
63.1
T1
50.2
54.7
D3
51.6
53.5
C11
38.7
39.3



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