Delta Electronics DNL Series Supplementary Manual Download Page 7

 

8.2 Output Characteristics

 

 

8.2.1 Line Regulation 

 

Line Regulation Deviation is defined as the change in output voltage caused by varying the 
input voltage over a specified range while the output load and temperature remain constant. 

 

Test 

1)  Turn on the fan.  
2)  Set the output power to the desired operating point. 
3)  Set the switch SW2 to the converter ON. 
4)  Adjust the input voltage across the converter’s input range (refer to specified range) while 

monitoring DVM2. 

5)  Note the m/- deviation of the output voltage over the full range of the input 

operating voltage (please refer to the data sheet for the detailed specification). 

 

8.2.2 Load Regulation 

 

Load Regulation Deviation is defined as the change in output voltage caused by varying the 
output load current over the specified range (no load to full load) while the input voltage and 
temperature remain constant. 

 

Test 

1)  Turn on the fan. 
2)  Set the input voltage to the desired operating level while monitoring DVM2. 
3)  Set the switch SW2 to the converter ON. 
4)  Adjust the output load across the converter’s operating load range. 
5)  Note the m/- deviation of the output voltage over the full range of the operating 

load range (please refer to the data sheet for the detailed specification). 

 

8.2.3 Output Ripple 

 

Output Ripple is defined as the periodic AC component on the DC/DC converter’s output 
voltage. The output ripple is measured in terms of peak to peak and RMS values, both done 
with a specific bandwidth. 

 

Test 

1)  Turn on the fan. 
2)  Set the switch SW2 to the converter ON. 
3)  Adjust the input voltage while monitoring DVM2 and set the output load to the full rated 

load current. 

4)  Adjust channel 2 on the oscilloscope to be AC coupled at 4µS/Div and at 10mV/Div using 

the 20 MHz bandwidth-limit option on the scope.

 

5)  The output ripple of the DC/DC converter is measured at full load operating power

  
 

Summary of Contents for DNL Series

Page 1: ...dels possess a myriad of standard protection features This document guides the user through the evaluation procedures to qualify a POL module The data shown in this Evaluation Procedure is for the SMT...

Page 2: ...3 3 Digital multi meters one with 20A range and ideally all with 4 1 2 digit resolution DVM1 DVM2 and DVM3 Zentech 2041 or equivalent 3 4 An electronic load Chroma 63030 or equivalent 300W approximate...

Page 3: ...BNC cable length less than 20 inches 500mm from BNC1 of the Evaluation Board to Channel 1 of the oscilloscope See Item 3 2 This cable is used to measure the input voltage between SVIN and SGND 4 6 Con...

Page 4: ...termine that the correct module is being evaluated Note DNM04S0A0S10P A would denote the SMT package while DNM04S0A0R10P A would denote the SIP package This Evaluation Board is for use with SMT packag...

Page 5: ...e converter requires a margin trim up push the SW3_4 to ON position Please refer to the SW3 Function table SW3 Function table Subdivide switch No Function SW3_1 Voltage trim up SW3_2 Voltage trim down...

Page 6: ...e Item 7 1 5 4 Test the input under voltage function while observing DVM2 DVM3 and channel 1 of the oscilloscope Increase the input voltage until the output of the converter reaches the appropriate va...

Page 7: ...voltage and temperature remain constant Test 1 Turn on the fan 2 Set the input voltage to the desired operating level while monitoring DVM2 3 Set the switch SW2 to the converter ON 4 Adjust the output...

Page 8: ...program the output voltage of the DNL04S module to 1 8Vdc below is the calculation of Rtrim 15004 5110 7525 0 8 1 21070 set R The table 1 provides the Rset value required for some standard output and...

Page 9: ...nge please refer to the data sheet for the detailed specification 2 Output Voltage Set Point Adjustment by external voltage source For DNM and DNL series trim to Vo set using an external voltage sourc...

Page 10: ...t pin for Trim down The Rmargin up is for trim up and Rmargin down is for trim down Please refer to the data sheet and Evaluation Board Schematic for the detailed information A software tool for volta...

Page 11: ...equential start up is implemented by connecting the power good signal PWRGD pin of PS1 to the TRACK pin of PS2 with a resistor capacitor RC circuit The power up and down that waveforms in Figures 4 an...

Page 12: ...ne the tracking method that is implemented To simplify the tracking design set the initial value of R2 equal to 20K at internal circuit and adjust the resistor R1 for different tracking method Figure...

Page 13: ...PS2 Voset PS2 3 3V R1 is calculated as follows K K R 75 55 20 32 1 32 1 7 1 3 3 1 Figure 7 Ratio metric tracking Power up Figure 8 Ratio metric tracking Power down For Ratio Metric applications that n...

Page 14: ...he objective is to minimize the voltage difference between the power supply outputs during power up and down The waveforms of power up and down are showed in Figures 13 and 14 For type A DNXXX0A0XXXX...

Page 15: ...start up when VoPS2 tracks the VoPS1 only for type C R1 R2 TRACK VoPS1 PS2 VoPS2 PS1 Vin Vin ENABLE ENABLE To Tracking circuit 20K 30 1K Figure 12 PS1 and PS2 track output voltage Simultaneous start...

Page 16: ...bsolute maximum voltage cannot over the Vin 5 For type A When Tracking is unused put R1 equal to 1K and connect TRACK pin to Vcc For type C When Tracking is unused put R1 equal to 30 1K and connect TR...

Page 17: ...ge 2 Turn on module by using the Enable on off Note There is some difference in the performance of each mode please refer to the data sheet for the detailed information Test Turn on the module by usin...

Page 18: ...8 4 Thermal Characteristic 8 4 1 Efficiency Efficiency is the ratio of total output power to the input power It is typically measured at full load and nominal input voltage Test 1 Turn on the fan 2 Se...

Page 19: ...Appendix A Evaluation Board Schematic 19...

Page 20: ...x 886 3 4513485 Email DCDC delta com tw Warranty Delta offers a two 2 year limited warranty Complete warranty information is listed on our web site or is available upon request from Delta Information...

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