JC5S33-500 Datasheet, PDF (5/8 Pages) Wall Industries,Inc. – 2:1 Wide Input Range Single and Dual Output 2 Watt DC/DC Converter

JC Series
2:1 Wide Input Range
Single and Dual Output
2 Watt DC/DC Converter
DESIGN & FEATURE CONSIDERATONS
Input Source Impedance
The power module should be connected to a low ac-impedance input source. Highly inductive source
impedances can affect the stability of the power module.
In applications where power is supplied over long lines and output loading is high, it may be necessary
to use a capacitor at the input to ensure startup.
By using a good quality low Equivalent Series Resistance (ESR < 1.0Ω at 100kHz) capacitor of 8.2µF
for the 5V input devices, a 3.3µF for the 12V input devices, and a 1.5µF for the 24V and 48V devices. A
capacitor mounted close to the power module helps ensure stability of the unit.
Maximum Capacitive Load
The JC Series has a limitation of maximum connected capacitance on the output. The power module
may operate in current limiting mode during start-up, affecting the ramp-up and the startup time. The
maximum capacitance can be found in the “Output Voltage / Current Rating Chart.”
Over Current Protection
To provide protection in a fault (output overload) condition, the unit is equipped with internal current
limiting circuitry and can endure current limiting for an unlimited duration. At the point of current-limit
inception, the unit shifts from voltage control to current control. The unit operates normally once the
output current is brought back into its specified range.
Thermal Considerations
Many conditions affect the thermal performance of the power module, such as orientation, airflow over
the module, and board spacing. To avoid exceeding the maximum temperature rating of the components
inside the power module, the case temperature must be kept below 90°C. The derating curves are
determined from measurements obtained in an experimental apparatus.
Wall Industries, Inc. 5 Watson Brook Road Exeter, NH 03833
603-778-2300 www.wallindustries.com Fax [phone]