LV200 Datasheet, PDF (8/12 Pages) Wall Industries,Inc. – 200 Watt Half-Brick DC - DC Power Converters

Wall Industries, Inc.
Advanced Publication
LV200 SERIES
200 Watt Half-Brick DC/DC Power Converters
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.
Over Current Protection
The converter is protected from short circuit and over current conditions. During these fault conditions, the converter
output will ‘hiccup’. The converter output will recover once the short or over current fault is removed.
Over Temperature Protection (OTP)
The converter has internal thermal protection that will shut the converter OFF once the case temperature exceeds the
OTP turn-off limit. The converter will resume operation when the case temperature has dropped below the OTP turn-on
limit.
Input Filter
It is recommended to bypass the +Vin and –Vin pins of the converter with a minimum of 680µF (100V minimum)
capacitor. No other bypassing is needed. However, to reduce the input ripple beyond what is seen in Photo 1, larger
values of capacitance may be used. Additionally, an inductor may be placed between the source and the previously
mentioned capacitor. No inductor should be placed between the capacitor and the input to the converter.
Input Filter Setup
Low
Impedance
Source
+V_in
680µF
1µF
electrolytic ceramic
capacitor capacitor
-V_in
LV200 SERIES
Output Filter
No additional output capacitor is needed for the power supply to operate. However, to reduce the ripple and noise on
the output, additional capacitance may be added. A 100µF Ceramic capacitor may be added across the +Vo and –Vo pins
to reduce the ripple and spike noise. Additional capacitance in the form of a tantalum or aluminum electrolytic may also
be placed across these pins in order reduce ripple and improve the transient peak-to-peak voltage deviation.
Remote Sense
To improve the regulation at the load, route the connections from the -RS and the +RS pins to the –Vo and +Vo
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 –RS and +RS pins may be left open or they may be
shorted to the -Vo and +Vo pins respectively. Shorting the RS pins to the Vo pins will reduce the voltage drops through
the converter pins.
07/11/2013
Wall Industries, Inc. • 37 Industrial Drive, Exeter, NH 03833 • Tel: [phone] • Toll Free: 888-597-9255 • Fax [phone]
website: www.wallindustries.com • e-mail: [e-mail]
Page 8 of 12