Delta Electronics S48SS User Manual

Evaluation Procedure
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Delta Delphi Series 48Vin S48SR and S48SS
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
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Delta Electronics, Inc.
3.0 Equipment Required
3.1 (1) 0 ~ 80 V @ 0 ~10 A Power Supply (Chroma 6230K-80 or Equivalent)
3.2 (1) 4 Channel 150 MHz Oscilloscope, (1) 1× scope probe, (1) 10× scope probe (Yokogama DL 1540C 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).
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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)
6.2 Output Characteristics
Line Regulation Load Regulation Output Regulation Output Overvoltage Protection
6.3 Dynamic Characteristics
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
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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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