IL34262 Datasheet, PDF (5/9 Pages) List of Unclassifed Manufacturers – Power Factor Controllers

IL34262
<Design Equations>
APPLICATION INFORMATION
The application circuits shown in Figures 19, 20 and 21
reveal that few external components are required for a
complete power factor preconverter. Each circuit is a
peak detecting current-mode boost converter that
operates in critical conduction mode with a fixed on-time
and variable off-time. A major benefit of critical
conduction operation is that the current loop is inherently
stable, thus elimination the need for ramp compensation.
The application in Figure 19 operates over an input
voltage range if 90 Vac to 138 Vac and provides an
output power of 80W (230V at 350mA) with an
associated power factor of approximately 0.998 at
nominal line. Figures 20 and 21 are universal input
preconverter examples that operate over a continuous
input voltage range of 90 Vac to 268Vac. Figure 20
provides an output power of 175W (400V at 440mA)
while Figure 21 provides 450W (400V at 1.125A). Both
circuits have an observed worst-case power factor of
approximately 0.989. The input current and voltage
waveforms of Figure 20 are shown in Figure 22 with
operation at 115 Vac and 230 Vac. The data for each of
the applications was generated with the test set-up
shown in Figure 24.