MIW2100 Series
Test Configurations
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.
Input Reflected-Ripple Current Test Setup
Input reflected-ripple current is measured with a inductor
Lin (4.7uH) and Cin (220uF, ESR < 1.0[ at 100 kHz) to
simulated source impedance.
Capacitor Cin, offsets possible battery impedance.
Current ripple is measured at the input terminals of the
module, measurement bandwidth is 0-500KHz.
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
on the input to insure startup.
To Oscilloscope
+Vin
+Out
+
+
Lin
DC / DC
Converter
Current
Probe
Load
Battery
Cin
-Vin
-Out
By using a good quality low Equivalent Series Resistance
(ESR < 1.0[ at 100 kHz) capacitor of a 4.7uF for the 24V
input devices and a 2.2uF for the 48V devices, capacitor
mounted close to the power module helps ensure stability of
the unit.
Peak-to-Peak Output Noise Measurement Test
Use a Cout 0.47uF ceramic capacitor.
Scope measurement should be made by using a BNC
socket, measurement bandwidth is 0-20 MHz. Position the
load between 50 mm and 75 mm from the DC/DC Converter.
+
+Vin
DC / DC
+Out
-Out
+
DC Power
Source
Load
Converter
Cin
+Vin
+Out
Copper Strip
Cout
-
-Vin
Single Output
DC / DC
Resistive
Load
Scope
Converter
-Vin
-Out
Output Ripple Reduction
A good quality low ESR capacitor placed as close as
practicable across the load will give the best ripple and noise
performance.
To reduce output ripple, it is recommended that 3.3uF
capacitors are used on output.
Copper Strip
Cout
+Vin
+Out
Com.
-Out
Scope
Scope
Dual Output
DC / DC
Resistive
Load
Converter
Cout
+
+Vin
+Out
-Vin
Single Output
DC / DC
DC Power
Source
Converter
Cout
Load
-
-Vin
-Out
Design & Feature Considerations
Maximum Capacitive Load
+
+Vin
+Out
The MIW2100 series has limitation of maximum connected
capacitance on the output.
Dual Output
Cout
Load
DC Power
Source
The power module may operate in current limiting mode
during start-up, affecting the ramp-up and the startup time.
Connect capacitors at the point of load for best
performance.
DC / DC Com.
Converter
-
-Vin
-Out
The maximum capacitance can be found in the data sheet.
Overcurrent Protection
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