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AN4129 bảng dữ liệu(PDF) 13 Page - STMicroelectronics

tên linh kiện AN4129
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AN4129 bảng dữ liệu(HTML) 13 Page - STMicroelectronics

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AN4129
Power converter performance
Doc ID 023314 Rev 1
13/39
3.4
Addition of diode clamp to limit input current
Since the peak FET current is directly controlled by the voltage on the ILED pin, a diode
clamp can be added to limit the voltage increase to reasonable levels. The graph below
shows the results for two diode types, a fast P-N diode having about 0.6 V forward drop, and
a Schottky diode having about 0.3 V forward drop, placed across the DC filter capacitor.
Figure 15.
Power loss vs. sinusoidal input voltage
The input current increase can now be limited to a reasonable value. There are two
consequences of this addition:
●
Line regulation is lost at low input voltages (the ILED pin cannot rise to regulate
current).
Figure 16.
Output current vs. input voltage
●
And THD is significantly improved at low input voltage:
Figure 17.
THD vs. input voltage



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