Instruction/ maintenance manual of the product DNM Delta Electronics
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Evaluation Procedure (DEP-001 A) The Delphi DNM and DNL Series of SIP type POL converters The DNM and DNL, 2.4~5.5V or 10~14V input, programmable output, non-isolated point of load DC/DC converters, are the latest of fering from one of the world’s largest power supply manufacturers ― Delta Electronics, Inc.
2 3.0 Equipment Required 3.1 A DC Power Supply 0 - 20 V @ 0 - 20A (Agilent 6574A 0 -60V/0 - 35A or equivalent). 3.2 An oscilloscope (T ektronix TDS 3034 or equivalent) 4 Channel 300 MHz, equipped with a x1 scope probe, a x10 scope probe, and two BNC cables (length less than 20 inches/500mm) 3.
3 4.1 Connect one lead from the “+” lead of the DC source (S ee Item 3.1) to the “20A” terminal of the first multi-meter DVM1 (See Item 3.3). Then connect one lead from the “Common” of the DVM1 to the “Vin” pin of the Evaluation Board.
4 6.0 T est s Performed The following tests are p erformed at room temperature (+25 ℃ ). 6.1 Input Characteristics Input V oltage Range. Under-V oltage Lockout. No Load Input Current. 6.2 Output Characteristics Line Regulation. Load Regulation.
5 5) SW2 is used to enable or disable the converter . For positive logic module, When SW2 is pose for the ON position, the converter is ON, and SW2 is pose for the OFF position, the converter is OFF . For negative logic module, When SW2 is pose for the ON position, the converter is OFF , and SW2 is pose for the OFF position, the converter is ON.
6 8.0 T est s and Evaluation 8.1 Input Characteristics 8.1.1 Input V oltage Range and Under-V olt age Lockout The DNM04xx and DNL04xx Series of DC/DC converters will operate at full load from 2.
7 8.2 Output Characteristics 8.2.1 Line Regulation Line Regulation Deviation is defined as the change in output volt age caused by varying the input voltage over a specified range while the ou tput load and temperature remain const ant. T est 1) T urn on the fan.
8 8.2.4 Output V olt age Set-point Programming (1) Output V olt age Set-Point Ad justment by external resistor Output V oltage Set-point Programming can be carried out by using the external program resistor connect between TRIM pin to ground to set output volt age set-point from 0.
T able 2. Vo , s e t Rset (k Ω ) R33 Recommend Value, R//R 0.7525 Open Open 1.2 22.464 23.7k//432k 1.5 13.047 14.0k//191k 1.8 9.024 9.53k//169k 2.5 5.009 5.23k//118k 3.3 3.122 3.16k//261k 5.0 1.472 1.5k//78.7k T est 1. Put the resistor to program the desired output voltage set point by follow T able 1 and T able 2 for the standard output.
For DNM12xx and DNL12xx series () 7525 . 0 0667 . 0 7 . 0 − × − = Vout Vtrim V For example, to program the output voltage of a DNL12 module to 3.3 Vdc, Vtrim is calculated as follows: () 53 . 0 7525 . 0 3 . 3 0667 . 0 7 . 0 = − × − = Vtrim V T able 4.
11 8.2.6 Voltage Tracking The DNM/DNL family was designed for applications that have output voltage tracking requirements during power-up and power-down. The devices have a TRACK pin to implement three types of tracking method: sequential, rati o-metric and simultaneous.
12 Figure 4: Sequential Power up Figure 5: Sequential Power down Ratio-Metric Implementation Ratio–metric is implemented by the selection of the resistor values of the voltage divider on the TRACK pin. Resistors R1 and R2, in Figure 6 determine the tracking met hod that is implemented.
For Ratio-Metric applications that need the PS1 and PS2 outputs arrive regulation set point at same time, use equation 1 to calculate R1, set △ V=Vo set,PS1 –Vo set,PS2 and △ V will be negative. The waveforms of power up and down are showed in Figures 7 and 8.
14 For example, the PS1 Vo set,PS1 =5V, the PS2 Vo set,PS2 =3.3V, R1 is calculated as follows: K K R 303 . 10 20 * 32 . 1 ] 32 . 1 ) 3 . 1 3 . 3 [( 1 = − − = Ω Figure 9.
15 For type C (DNXXX0A0XXXX C ), th e simultaneous tracking can be accomplished by putting R1 equal to 30.1K Ω through Vo PS1 to the TRACK pin of PS2. Figure 12 shows the circuit diagram of Simultaneous start-up when Vo PS2 tracks the Vo PS1 (only for type C).
16 Notes on the use of Track function: 1. For proper voltage tracking, first, The ENABLE On/Off pin of the PS2 module is lef t unconnected (or tied to GND for negative logic modules or tied to VIN for positive logic modules), so that the modules are ON by default and second applied input voltage to the PS1 and PS2.
T est 1) T urn on the fan. 2) Adjust the input voltage to the desired operating point. 3) Set the electronic or resistive load at 50% of maximum load. 4) Change channel 1 to scope probe and measure across the dynamic R . 5) Set the switch SW2 to the converter ON.
4. Connect a scope probe from channel 1 between the on/off control pin and re ference ground (SGND) on the Evaluation Board. 5. Set channel 2 on the oscilloscope to be DC coupled and within appropriate range fo r the output voltage. 6. Connect a coaxial cable from channel 2 to BNC2 on the Evaluation Board.
Appendix A- Evaluation Board Schematic 19.
Appendix B - Evaluation Board Layout (Top View) Appendix C - Evaluation Board Layout (Bottom View) CONTACT DATA: www. delt aww.c om USA: Telephone: East Coast: (888) 335 8201 West Coast: (888) 335 8208 Fax: (978) 656 3964 Email: DCDC@delta-corp.
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If you already are a holder of Delta Electronics DNM, but have not read the manual yet, you should do it for the reasons described above. You will learn then if you properly used the available features, and whether you have not made any mistakes, which can shorten the lifetime Delta Electronics DNM.
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