The MAX5042 evaluation kit (EV kit) is a fully assembled
and tested circuit board that contains a high-efficiency,
high-power, isolated, hot-pluggable, 40W (with adequate
cooling) forward DC-DC converter in the industrystandard
half-brick footprint. The circuit is configured for
a +5.0V output voltage and provides up to 8A of current.
Power for the circuit can be provided from either a +36V
to +75V or -36V to -75V DC source used in the telecom/
datacom markets (48V modules), industrial environments,
or in automotive 42V power systems.
A high efficiency of up to 85% at 6A and 30W output
power is achieved using a clamped two-transistor
topology. Part of the efficiency improvement is due to
the recovery of stored leakage and magnetizing inductance
energy at the primary side. Galvanic isolation is
achieved by an optocoupler and the surface-mount planar
transformer.
Operation at 250kHz allows the use of small magnetics
and output capacitors. The EV kit provides cycle-bycycle
current-limit protection. Additional steady-state
fault protection is provided by integrating fault protection
and internal thermal shutdown. The MAX5042 also
has a programmable undervoltage lockout (UVLO).
Warning: The MAX5042 EV kit is designed to operate
with high voltages. Dangerous voltages are present on
this EV kit and on equipment connected to it. Users
who power up this EV kit or power the sources connected
to it must be careful to follow safety procedures
appropriate to working with high-voltage electrical
equipment.
Under severe fault or failure conditions, this EV kit may
dissipate large amounts of power, which could result in
the mechanical ejection of a component or of component
debris at high velocity. Operate this EV kit with
care to avoid possible personal injury.
Do not short the -VIN pad to the "EV kit Ground" when
the hot-swap MOSFET N1 is off (please consult the
"Absolute Maximum Voltage Rating Diagram" in the
MAX5042 data sheet). The -VIN pad and EV kit ground
are at an 80V difference. The EV kit user should not
probe the circuit with an oscilloscope probe and
ground clip unless they have high-voltage hot-swap
experience.
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