Status
Active: In Production.
Description
The MAX256 evaluation kit (EV kit) is a fully assembled
and tested PCB that contains a 3W isolated H-bridge
DC-DC converter. The circuit is configured for unregulated
output voltages of approximately +5V and -5V
(with respect to an isolated ground). Output current is
up to 600mA from either output, or 300mA from each of
the two outputs. Input power for the circuit is provided
from a +5VDC source, or operates at any input voltage
down to +3V with a corresponding reduction in the output
voltages.
The EV kit provides greater than 85% overall efficiency
at +5V between 250mW and 2W output power using an
H-bridge DC-DC converter topology. Input ripple current
and radiated noise are minimized by the inherent
balanced nature of the design with no interruption in the
input current. Undervoltage lockout (UVLO) and thermal
shutdown provide for a robust 3W isolated supply.
The surface-mount transformer provides up to
1500VRMS galvanic isolation with each output powered
from a center-tapped full-wave rectifier circuit to reduce
output voltage ripple.
Operation at 400kHz allows the use of ceramic output
capacitors and a small transformer.
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