STEVAL-ILB001V2 STMicroelectronics, STEVAL-ILB001V2 Datasheet - Page 5

• Manufacturer Part Number: STEVAL-ILB001V2
• Description: BOARD EVAL BIPO SOLUTION FOR PFC
• Manufacturer: STMicroelectronics

Specifications of STEVAL-ILB001V2

• Mfg Application Notes: HF Ballast AppNote
• Design Resources: STEVAL-ILB001V2 Gerber Files STEVAL-ILB001V2 Schematic STEVAL-ILB001V2 Bill of Materials
• Main Purpose: Lighting, Ballast Control
• Embedded: No
• Utilized Ic / Part: L6569
• Primary Attributes: 40W HF Ballast
• Secondary Attributes: Discontinuous Mode Boost Converter
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 497-6409; STEVAL-ILB001V2

AN2349
1
PFC solutions for low-medium power HF Ballasts
The Valley Fill circuit is an example of a low-cost passive PFC available on the market.
Figure 1.
Figure 2.
The capacitors are charged in serie, and discharged, via the two diodes, in parallel. Current
is drawn from the line from 30° to 150°, and then from 210° to 330°. Discontinuities occur
from 150° to 210° and from 330° to 360°, and then the cycle repeats itself.
Disadvantages of this PFC solution are spikes on input current waveform and large zero
current gaps between the half sinusoidal wave and the next one (meaning a lower power
factor and high input current distortion), and high ripple in the DC output voltage that causes
poor performance in High Power Lamps. On the other hand, high performances can be
achieved by IC driver optimized for controlling PFC regulators in boost topology as shown in
Figure 3.
Valley Fill circuit schematic diagram
Valley Fll input current waveform
INPUT
INPUT
INPUT
INPUT
AC
AC
AC
AC
RECTIFIER+PFC+DC
RECTIFIER+PFC+DC
RECTIFIER+PFC+DC
RECTIFIER+PFC+DC
FILTER BLOCK
FILTER BLOCK
FILTER BLOCK
FILTER BLOCK
PFC solutions for low-medium power HF Ballasts
CONVERTER/
CONVERTER/
CONVERTER/
CONVERTER/
BALLAST
BALLAST
BALLAST
BALLAST
DC-AC
DC-AC
DC-AC
DC-AC
LAMP
LAMP
LAMP
LAMP
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