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Delphi Series S48SR and S48SS
Evaluation Procedure
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
1.0 Purpose
as extremely high reliability under
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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
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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 Curr
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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 negati
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4) The converter may also be turned on by switching SW1 to the appropriate logic enable position and ramping the voltage manually or turning on the Power Supply with a preset output voltage (S48SS only). 5) Toggle SW1 to the “OFF” position after performing each test (S48SS only). 8.0 Test and Evaluation 8.1 Input Characteristic 8.1.1 Input Voltage Range The Delphi S48SS3R304NR and S48SR3R304ER DC/DC converters will operate at full load from 36Vin to 75Vin, steady state. The con
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8.1.3 Input Current Module Off (S48SS only) Test 1) Set the enable switch SW1 to the appropriate logic enable position to disable the power supply (as defined in Section 7.1). 2) Adjust the input power supply to the desired operating point of interest while monitoring DVM2. 3) Note the input current from DVM1. 4) This reading is the result of the Disable Input Current of the DC/DC converter. The Disable Input current will be around 1 mA (please refer to the datasheet for the detaile
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8.2.3 Output Ripple Output Ripple is defined as the periodic AC component at the DC/DC converters output voltage. The output ripple is measured in Peak to Peak and RMS values, both done with a specific bandwidth. Test 1) Turn on the fan. 2) Set the enable switch SW1 to the appropriate logic enable position. 3) Adjust the input voltage and output load to the desired operating point (S48SS only). 4) Adjust Channel 2 on the oscilloscope to be AC coupled @ 2uS / Div and 50mV/Div to use
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8.3.2 Soft Start Turn-On Time Soft Start Turn-On Time is defined as the time it takes for the output to rise to within 95% of its final value from the time when the converter is enabled. The rise time is deliberately made slower to reduce the inrush current and to eliminate any overshoot in the output voltage. Test -S48SR & S48SS ( turn on the module by using the input power supply) 1) Turn on the fan. 2) Set the enable switch SW1 to the appropriate logic enable position (S48SS only)
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Note: Different electronic loads may have dramatically different results because of their input characteristics during Turn-On. If the Turn-On appears abnormal, replace with an actual resistive load of appropriate value. The Soft Start Turn-On Time of the converter provided in the Evaluation Kit was measured with the Electronic Load set at 4.5A. 8.4 Thermal Characteristics 8.4.1 Efficiency Efficiency is the ratio of total output power to the input power. It is typically measured
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7) Use the following formulas to calculate the efficiency: Efficiency= (Pout/Pin) × 100(%) Pin = Iin × Vin Pout = Iout × Vout The following graph shows the efficiency results of the S48SS/S48SR converters measured at different operating points. 90 85 80 75 70 65 60 36Vin 48Vin 55 75Vin 50 0.5 1 1.5 2 2.5 3 3.5 4 4.5 OUTPUT CURRENT (A) Appendix A- Evaluation Board Schematic SVin+ COPPER VIN+ L1 VIN+ VOUT+ VOUT+ NC BNC1 BNC2 TRIM C2 C3 NC 68u/100V C101 C102 C103 C104 C107 C108 C
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Appendix B - Evaluation Board Layout (Top View) 11
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Appendix C- Evaluation Board Layout (Bottom View) CONTACT DATA: www.deltaww.com USA: Europe: Asia: Telephone: Telephone: Telephone: +886 3 4526107 x6202 East Coast: (888) 335 8201 France: +33 1 6485 1212 Fax: +886 3 4331707 West Coast: (888) 335 8208 Germany: +49 89 370 62 897 Email: DCDC@delta.com.tw Fax: (978) 656 3964 UK: +44 777 195 6299 Email: DCDC@delta-corp.com Fax: +33 1 6485 1212 Email: DCDC@euro.delta-corp.com Warranty Delta offers a two (2) ye
