Technical Reference Note
Rev.12.08.17_#1.1
ERM 10W Series
Page 52
Application Notes
Peak-to-Peak Output Noise Measurement Test
Use a 1μF ceramic capacitor and a 10μF tantalum 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.
Copper Strip
Cout
+Vin
+Out
-Out
Copper Strip
Cout
+Vin
+Out
Com.
-Out
Scope
Scope
Single Output
DC / DC
Converter
Dual Output
DC / DC
Converter
Resistive
Load
Resistive
Load
Scope
Copper Strip
Cout
-Vin
Copper Strip
-Vin
Copper Strip
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 to use 4.7μF capacitors at the output.
+
+Vin
-Vin
+Out
+
+Vin
-Vin
+Out
-Out
Load
Load
Dual Output
DC/ DC Com.
Converter
Single Output
DC / DC
Converter
Cout
Cout
DCPower
Source
DC Power
Source
Cout
Load
-
-
-Out
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. 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 100
KHz) capacitor of 4.7μF for the 24V input devices, a 2.2μF for the 48V devices and a 1μF for the 110V devices.
+
+Vin
+Out
-Out
+
DC / DC
Converter
DC Power
Source
Load
Cin
-
-Vin
ARTESYN [ ARTESYN TECHNOLOGIES ]
