MSKUW Datasheet, PDF (6/7 Pages) Wall Industries,Inc. – 5 Watt DC/DC Converter Single and Dual Outputs

Rev A
MSKUW Series
5 Watt DC/DC Converter
Single and Dual Outputs
4:1 Ultra Wide Input Voltage Range
DESIGN & FEATURE CONSIDERATONS
Over Current Protection
To provide protection in a fault (output over load) 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 to its specified range.
Input Source / Remote On/Off
Positive logic remote on/off turns the module ON during a logic high voltage on the remote on/off pin, and turns the module
OFF during a logic low voltage on the remote on/off pin. To turn the power module ON and OFF, the user must supply a
switch to control the voltage between the on/off terminal and the -Vin terminal. The switch can be an open collector or
equivalent.
A logic low is –0.7V to 0.8V.
A logic high is 2.5V to 5.5V.
The maximum sink current of the switch at the on/off terminal during a logic low is 300µA. The maximum sink current of the
switch at the on/off terminal = 2.5 to 5.5V is 200µA or open.
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. A capacitor mounted close to the power module helps ensure
stability of the unit, it is recommended to use a good quality low Equivalent Series Resistance (ESR < 1.0Ω at 100KHz)
capacitor of 3.3µF for the 12V input models and a 2.2µF for the 24V and 48V input models.
+
DC Power
Source
-
+Vin
+
DC / DC
Converter
Cin
-Vin
+Out
-Out
Load
Maximum Capacitive Load
The MSKUW series has a limit of maximum connected capacitance at the output. The power module may be operated 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.
TEST CONFIGURATIONS
Input Reflected-Ripple Current Test Setup
Input reflected-ripple current is measured with an inductor Lin (4.7µH) and Cin (220µF, ESR < 1.0Ω at 100KHz) to simulate
source impedance.
To Oscilloscope
+Vin +Out
+
Battery
+ Lin
Cin
Current
Probe
DC / DC
Converter
-Vin -Out
Load
Capacitor Cin offsets possible battery impedance.
Current ripple is measured at the input terminals of the module. Measurement bandwidth is 0 ~ 500KHz.
Wall Industries, Inc. 5 Watson Brook Road Exeter, NH 03833
603-778-2300 www.wallindustries.com Fax [phone]