DSIW2021 Delta Electronics, Inc., DSIW2021 Datasheet - Page 4

• Manufacturer Part Number: DSIW2021
• Description: Delphi Dsiw200 Series Dc/dc Power Modules 24, 48vin, 2~3w Smd
• Manufacturer: Delta Electronics, Inc.

Test Configurations
Input Reflected-Ripple Current Test Setup
Input reflected-ripple current is measured with a inductor
Lin (4.7uH) and Cin (220uF, ESR < 1.0Ω at 100 KHz) to
simulate source impedance. Capacitor Cin is to offset
possible battery impedance. Current ripple is measured at
the input terminals of the module and measurement
bandwidth is 0-500 KHz.
Peak-to-Peak Output Noise Measurement
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. A Cout of 0.47uF ceramic capacitor is placed
between the terminals shown below.
+Vin
+Vin
-Vin
Dual Output
-Vin
Single Output
To Oscilloscope
Converter
DC / DC
+
Converter
DC / DC
Battery
+
+Out
+Out
Com.
-Out
-Out
Cin
Lin
Copper Strip
Copper Strip
Current
Probe
Cout
Cout
Cout
+Vin
-Vin
Converter
DC / DC
Scope
+Out
-Out
Scope
Scope
Resistive
Resistive
Load
Load
Load
Design & Feature Considerations
The DSIW2000 circuit block diagrams are shown in
Figures 5 and 6.
Figure 5: Block diagram of DSIW2000 single output
modules.
Figure 6: Block diagram of DSIW2000 dual output
modules
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 input of 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
a 4.7uF for the 24V input devices, and a 2.2uF for the
48V devices.
+Vin
+Vin
-Vin
-Vin
DC Power
Source
Filter
Filter
LC
LC
+
-
+
Cin
PFM
PFM
+Vin
-Vin
Converter
DC / DC
Isolation
Isolation
+Out
-Out
Ref.Amp
Ref.Amp
Load
Com.
+Vo
+Vo
-Vo
-Vo
4