MPP, Sendust, High Flux
breakthrough in Transformer technology that will reduce
YOUR COST by at least 50%, eliminate hot spots, bus bars,
and reduce leakage inductance. These transformers have
low profile, high dielectric isolation, high density,
high power and high coupling between windings. They also
offer equal current sharing, and flexibility in designs
not available with conventional transformers.
Why are these possible?
- The Flat Transformer is the first
technological breakthrough in transformer
technology in the last 60 years. It overcomes the
limitations of a conventional transformer, such
as hot spots due to poor heat dissipation, high
leakage inductance, poor high frequency
characteristics, tedious manufacturing process
and bulkiness in packaging.
- Cost reductions of greater than 50% are made
possible by incorporating relatively smaller,
simpler, and less expensive square cores of
pressed ferrites in the Flat Transformers. These
cores are packaged in a modular block with
built-in single turn secondary winding using
simple, stamped and formed parts. The modular
blocks are mass produced which further reduces
the costs. Modular blocks offer great flexibility
in design. With thermal loading more evenly
distributed, smaller, lighter and less expensive
heat sinks can be used. In addition, parasitic
impedance can be better controlled which results
in less snubbing and less stress on ancillary
- Hot Spots are eliminated as individual elements
in Flat Transformers are small with high surface
to volume ratio. Thermal paths are short.
Build-up of bulk windings does not exist. The
core's geometry results in lower core losses.
With excellent heat dissipation, higher flux
densities can be used. Higher power densities are
achieved by tightly packaging the small size
transformer elements with its associated
semiconductor and inductor in a common heat sink.
- Leakage inductance is low because of excellent
coupling between the windings and the absence of
multiple turns. Terminations to ancillary
components and inductors are kept very short,
resulting in excellent control of parasitic
impedance. This also allows faster switching
The Flat Transformer and Inductors are ideally suited
for Switch Mode Power Converters where low costs, low
profile, high current, and high performance are important
The following data describes only one class of
transformer utilising the flat transformer technology
currently in production. Other classes of transformers
are available on request. Custom designs to suit your
unique application are welcomed.
PART NUMBER: FTI-12x2A-1A (for one module):
Dimension of each module:
Length: 5.4 cm (2.12").
Height: 1.17 cm (0.46")
Width: 1.5 cm (0.63")
Power: 150 watts (5 volts DC @ 30 Amps per module)
Operation Frequency: 250 KHz - 500 KHz
Suitable for the following topologies:
Half-Bridge, Full-Bridge, Push-Pull
Output Voltage: 0 to 15 Volts DC
Input Voltage: up to 500 VAC depending on the
number of modules and the number of turns
Schematic diagram of a flat
The secondary is configured
as a push-pull buck converter output, requiring only the
addition of a filter capacitor. The primary windings are
threaded through all the modules later. Terminals are
provided for direct connection to TO-247 dual rectifier
for minimum lead inductance. Top and bottom surfaces are
DC to DC Converters.
Modules are optimized for 300 watts to 2000 watts
switching power supplies (600 watts requires 4 modules,
2000 watts requires 14 modules).
Turn Ratios: N x P : 1
N = Number of modules placed side by side
with holes aligned.
P = Number of primary windings through ALL the modules.
Example, for a turn ratio of 8:1, 600 watts:
Use N = 4 modules and P = 2 turns primary through all
Inductance (min.) of each
module, lm = 10 µ