The Delphi Series S48SR and S48SS,
48V input, single output, isolated DC/DC
converters are the latest offering from one
of the world’s largest power supply
manufacturers ― Delta Electronics, Inc.
With creative design technology and
optimization of component placement,
these converters possess outstanding
electrical and thermal performance, as well
as extremely high reliability under highly
stressful operating conditions. All models
are protected from abnormal input/output
voltage and current conditions. An
encapsulated version is available for the
most robust performance in harsh
environments.
This document guides the user through the
evaluation procedures to qualify a Delphi
module. The data shown in this Evaluation
Procedure is for the 3.3V unit. Please refe
to the appropriate technical data sheet fo
detailed performance and technical
information for Delphi units with differen
output voltages.
Delphi Series S48SR and S48SS
1.0 Purpose
This document guides the user to perform
electronic measurements on a Delphi
S48SR, 15W or a S48SS, 15W DC/DC
converter using the Delta Evaluation Board.
2.0 Relevant Documentation
The document and general knowledge listed
below is relevant to this evaluation
procedure:
2.1 S48SR or S48SS Series Applicable
Data Sheet
2.2 2”×1” Power Module Evaluation Board
Schematic
2.3 2”×1” Power Module Evaluation Board
Layout
2.4 General Test and Safety Procedures
2.5 ESD Protection
Evaluation Procedure
EP_SP
Version X1.0 November 2002
1
Delta Electronics, Inc.
3.0 Equipment Required
3.1 (1) 0 ~ 80 V @ 0 ~10 A Power Supply (Chroma 6230K-80 or Equivalent)
3.3 (1) 4 1/2 Digital Multimeter (DVM3) (HP34401A or Equivalent)
3.4 (2) 3 1/2 Digital Multimeter (DVM1 and DVM2) (FLUKE 45 or Equivalent)
3.5 (1) 300W Electronic or Resistive Load (Chroma 6304)
4.0 Equipment Set-Up and Description
4.1 Connect one wire from the “+” lead of the Power Supply (Item 3.1) to the “10A” of the
DVM1 (Item 3.4). Then connect one wire from the “Common” of the DVM1 to the
“Vin +” pin of the Evaluation Board.
4.2 Connect one wire from the “-” lead of the Power Supply to the “Vin -“ pin of the
Evaluation Board. Note: Use 10 AWG wire or similar for all connections in sections 4.1
and 4.2. Use twisted pair to reduce noise coupling.
4.3 Connect the plus “+” and minus “-“ connection wires from the multimeter (item 3.3) to
the “SVin +” and “SVin -” Pin on the Evaluation Board. The multimeter is designated
DVM2, above in Paragraph 3.0, Section 3.4.
4.4 Connect the plus “+” and minus “-“ connection wires from the multimeter (item 3.3) to
the “Sense +” and “Sense -” Pin on the Evaluation Board. The multimeter is designated
DVM3, above in Paragraph 3.0, Section 3.3.
4.5 Connect a BNC cable (length less than 20 inches) from BNC1 of the Evaluation Board
to Channel 1 of the oscilloscope (item 3.2).
4.6 Connect a BNC cable (length less than 20 inches) from BNC2 of the Evaluation Board
to Channel 2 of the oscilloscope (item 3.2).
4.7 Connect the Positive and Negative power leads of the Electronic load (assuring correct
polarity), or a resistive load to the Evaluation Board output terminal pin (“Vout +” for
positive power lead and “Vout -” for the negative power lead).
2
5.0 Thermal of the Converter
It is imperative that sufficient airflow be provided to the converter at all times during all
portions of testing. Please refer to the applicable data sheet for the proper cooling and
derating necessary to achieve accurate results when testing the converter.
6.0 Tests Performed
The following tests are performed at room temperature +25 C.
6.1 Input Characteristics
Input Voltage Range
Under Voltage Lockout
No Load Input Current
Disable Input Current (applies to S48SS version only)
Maximum Output Voltage Deviation (due to step change in load)
Response time (due to step change in load)
Soft Start Turn-On Time
6.4 Thermal Characteristics
Efficiency
3
7.0 Test Set-Up
7.1 Initial Set-Up
1) Examine the part number of the power module to determine of the unit is defined
for positive or negative logic enable as follows:
S48SS3R304NR would denote negative logic, while S48SS3R304PR would
denote positive logic (S48SS only).
2) If the power module has positive logic, switching SW1 to position HI or floating will
enable the power converter. Switching SW1 to position Low will disable the power
converter.
3) If the power module has negative logic, switching SW1 to position Low will enable
the power converter. Switching SW1 to position HI or floating will disable the power
converter.
4) Multimeters (1) Ampere / Autorange
Multimeters (2 and 3) Voltage / Autorange
5) Scope
Timebase 10 mS
Trigger Auto
Channel (1)
Volts / Div 10V
Coupling DC
Channel (2)
Volts / Div 1V
Coupling DC
6) Electronic Load
Turn on the Electronic Load and adjust the current level. The total output current is
4.5A (15W) for the S48SR power module and 4.5A (15W) for the S48SS power
module. Ensure the output load does not exceed the recommended maximum
current.
7) SW2 is used for trimming the output voltage. Turn SW2 to the OFF position if the
function is not being used. Turn SW2 to the UP position if trimming up is required.
Turn SW2 to the DOWN position if trimming down is required.
7.2 Initial Power Up
1) Turn the Power Supply on and increase the input voltage (use DVM2 to monitor the
voltage) until it reaches 48V (or the desired value).
2) Toggle SW1 to the appropriate logic position to turn the power module on (S48SS
only).
3) The converter is now operating, which can be verified by observing the DVM3
(approximately 3.3V.) and Channel 2 of the oscilloscope (+3.3V output).
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