ml4813 Micro Electronics Corporation, ml4813 Datasheet - Page 13

• Manufacturer Part Number: ml4813
• Description: Flyback Power Factor Controller
• Manufacturer: Micro Electronics Corporation

APPLICATIONS
INDUCTOR INFORMATION
L3 is the flyback inductor and also provides the operating
power for the control circuitry. A gapped ferrite pot core
was chosen for this application for it's modest high
frequency losses with high ripple current operation. Some
possible choices are:
The first 2 cores are sold ungapped and require the use of
a .025. spacer to gap the center leg to yield a total gap
length of 0.05". If an ungapped core is used, a "shorted
turn" should be employed as shown in Figure 14 to
prevent radiated EMI. The third core listed is sold with its
center ieg pre-gapped (0.07" total) so that the outside of
the core closes completely, providing shielding without a
shorted turn. N
#24AWG wire.
Inductors L1 and L2 are constructed using a powdered
iron. This is a suitable material for these inductors since
the high frequency ripple currents (and resulting flux
excursions) are much less severe than for L3. The core
selected is a MicroMetals T68-26D with 80 turns or
#24AWG wire.
Manufadurer
Magnetics Inc. F43019
Phillips
Phillips
S
should be 3 turns. All windings are
Part #
3019 PL00-3F3
3019 PA125-3C8
(Continued)
Total Gap
0.07"
0.05"
0.05"
N
32
32
38
P
Figure 14. EMI Shielding for Ungapped Cores
0.25" SPACER
WINDINGS
SHORTED TURN
(COPPER FOIL)
ML4813
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