FA12S15-300 Datasheet, PDF (4/14 Pages) Wall Industries,Inc. – 300W DC-DC Converter

WALL INDUSTRIES, INC.
Rev C
TECHNICAL DATASHEET
FA12S15-300
DESIGN CONSIDERATIONS
Under Voltage Lock Out (UVLO)
The converter output is disabled until the input voltage exceeds the UVLO turn-on limit. The converter will remain ON until the input
voltage falls below the UVLO turn-off limit. There is approximately 0.5V hysteresis in the UVLO circuit.
Over Current Protection
The converter is internally protected from short circuit and over current conditions. During these fault conditions, the converter output
will “hiccup”- (short) or “fold back” - (over current). The converter output will recover once the short or over current fault is removed.
Over Temperature Protection
The converter is protected from over temperature conditions. Upon exceeding this temperature, the converter will shut down. The
converter will automatically recover once it has sufficiently cooled.
Input Filter
A 1,000µF low ESR capacitor across the input pins is recommended for most system level designs. No additional input capacitance is
needed for the power supply to operate with low impedance inputs. However, most “real world” system level integration will have some
amount of trace or wiring lengths – raising the inductive impedance. The added input capacitor will bring the impedance back towards
unity.
Output Filter
No additional output capacitor is needed for the power supply to operate within stated specifications. However, if it is a requirement to
reduce the ripple and noise on the output, additional capacitance may be added. Usually, ceramic MLCC’s capacitor works best for
reducing H.F. spike noise. Also, capacitance in the form of a tantalum or aluminum electrolytic capacitor may also be placed across the
output in order reduce base ripple, and improve the load transient peak-to-peak voltage deviation.
Remote Sense
To improve the voltage regulation at the load, route the connections from the -Sense and the +Sense pins to the –Vout and +Vout
connections AT the load. This will force the converter to regulate the voltage at the load and not at the pins of the converter. If it is not
desired to use the Remotes Sense feature, the –Sense and +Sense pins should be connected to the -Vout and +Vout pins respectively.
Fusing
It is required that the input to the converter be supplied with a maximum 50 A, 250 V rated fuse.
Safety
The FA series is CE pending and pending approval of the following: UL1950, CUL950, TUV60950 FILE 155800. The isolation
provided by the FA Series is a Basic insulation in accordance with EN60950. SELV output reliability is maintained only if the input to
the FA converter is an SELV source.
Remote ON/OFF
The FA Series has Remote ON/OFF (Enable/Disable) capability using TTL logic levels. This function is offered as either
Active=TTL High (no suffix) or Active=TTL Low (R suffix), see order details on page 14. For Remote ON/OFF limits, see page 2.
Figure 2. Remote (L/E)
(888) 597-WALL
www.wallindustries.com
Page 4 of 14