Datasheet

MAX5941A/MAX5941B
IEEE 802.3af-Compliant Power-Over-Ethernet
Interface/PWM Controller for Power Devices
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COMPONENT SUPPLIERS WEBSITE
International Rectifier www.irf.com
Fairchild www.fairchildsemi.com
Power FETS
Vishay-Siliconix www.vishay.com/brands/siliconix/main.html
Dale-Vishay www.vishay.com/brands/dale/main.html
Current-Sense Resistors
IRC www.irctt.com/pages/index.cfm
ON Semi www.onsemi.com
General Semiconductor www.gensemi.com
Diodes
Central Semiconductor www.centralsemi.com
Sanyo www.sanyo.com
Taiyo Yuden www.t-yuden.comCapacitors
AVX www.avxcorp.com
Coiltronics www.cooperet.com
Coilcraft www.coilcraft.com
Magnetics
Pulse Engineering www.pulseeng.com
Table 3. Component Suppliers
where:
V
RIPPLE
is the combined RMS output ripple due to
VRIPPLE,ESR, the ESR ripple, and V
RIPPLE,C
, the
capacitive ripple. Calculate the ESR ripple and
capacitive ripple as follows:
V
RIPPLE,ESR
= I
RIPPLE
x ESR
V
RIPPLE,C
= I
RIPPLE
/(2 x π x 275kHz x C
OUT
)
Layout Recommendations
All connections carrying pulsed currents must be very
short, be as wide as possible, and have a ground plane
as a return path. The inductance of these connections
must be kept to a minimum due to the high di/dt of the
currents in high-frequency switching power converters.
Current loops must be analyzed in any layout pro-
posed, and the internal area kept to a minimum to
reduce radiated EMI. Ground planes must be kept as
intact as possible.