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AN4346 bảng dữ liệu(PDF) 17 Page - STMicroelectronics

tên linh kiện AN4346
Giải thích chi tiết về linh kiện  10 W wide range - high power factor - isolated LED driver using HVLED815PF
PDF  33 Pages
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nhà sản xuất  STMICROELECTRONICS [STMicroelectronics]
Trang chủ  http://www.st.com
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AN4346 bảng dữ liệu(HTML) 17 Page - STMicroelectronics

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AN4346
Measurement results
33
2.10
Overvoltage protection in no load condition
In the EVLHVLED815W10F demonstration board the OVP protection has been set at 30
VDC typ.
Regulated output voltage during no load condition can be fixed by selecting properly RDMG
and RFB (see the HVLED815PF datasheet) by Equation 1.
Equation 1
OVP voltage vs. input mains is represented in Figure 15.
Figure 15. OVP voltage vs. input mains
Waveforms of LED driver behavior are shown in Section 3: Electrical waveform on page 22.
2.11
Thermal measurements
To check reliability of design, the thermal maps have been checked with an IR camera.
The LED driver has been stressed at the nominal LED load number (POUT = 10 W) all over
the input mains voltage range. Only the minimum, maximum voltage range and the two
nominal mains voltage 100/50 Hz and 230/50 Hz have been reported.
VOUT
Ns
Naux
------------
RDMG
RFB
---------------- VREF VREF
Ns
Naux
------------
42
24
------
91k
16k
---------------
 2.51V 2.51V 42
24
------
30V
=
+
=
+
=



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