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Evaluation Procedure
(DEP-008 A)
The Delphi DNS Series of SIP type
POL converters
The
DNS,
2.4~5.5V
programmable output, non-isolated point of load
DC/DC converters, are the latest offering from
one
of
the
world's
manufacturers ― Delta Electronics, Inc. The
DNS converters have flexible and programmable
tracking and sequencing features to enable a
variety of startup voltages as well as sequencing
and tracking between power modules. 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.
possess
a
myriad
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 SIP Package Type POL evaluation board.
Please refer to the appropriate technical data
sheet for detailed performance and technical
information for the specific POL units.
Evaluation Procedure
EP_DNS_SIP_08052004
or
10~14V
input,
largest power
supply
All
models
of
standard
protection
DNS SIP Series
1.0 Purpose
This document guides the user in performing
electronic measurements on a DNS POL (point
of load) DC/DC converter using the Delta
Evaluation Board.
2.0 Relevant Documentation
The documentation and background information
listed below is relevant to this evaluation
procedure:
2.1 Appropriate date sheet for the DNS Series
unit under evaluation.
2.2 Power Module Evaluation Board Schematic.
2.3 Power Module Evaluation Board Layout.
2.4 General Test and Safety Procedures.
1
Delta Electronics, Inc.
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Summary of Contents for Delta Electronics DNS SIP Series
- Page 1 DC/DC converters, are the latest offering from world’s largest power manufacturers ― Delta Electronics, Inc. The DNS converters have flexible and programmable tracking and sequencing features to enable a variety of startup voltages as well as sequencing and tracking between power modules.
-
Page 2: Equipment Required
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 (Tektronix 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 Digital multi-meters, one with 20A range and ideally all with 4 1/2 digit resolution (DVM1, DVM2... - Page 3 4.1 Connect one lead from the “+” lead of the DC source (See 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. DVM1 is used to measure the input current. 4.2 Connect one wire from the “-”...
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Page 4: Tests Performed
6.0 Tests Performed The following tests are performed at room temperature (+25 ℃). 6.1 Input Characteristics Input Voltage Range. Under-Voltage Lockout. No Load Input Current. 6.2 Output Characteristics Line Regulation. Load Regulation. Output Regulation. Output Voltage Set-point Programming Output Voltage Margining Output Voltage Tracking 6.3 Dynamic Characteristics Maximum Output Voltage Deviation (due to step change in load). - Page 5 2. For the SW3_5~7 use at NPA series, must set to OFF position. 7.2 Initial Power Up 1) Turn the power supply ON, set the current limit on DC source (refer to specification of either converter) and increase the input voltage (use DVM2 to monitor the input voltage) until it reaches the desired value.
- Page 6 8.0 Tests and Evaluation 8.1 Input Characteristics 8.1.1 Input Voltage Range and Under-Voltage Lockout The DNS04xx Series of DC/DC converters will operate at full load from 2.4Vin to 5.5Vin for 5Vin (nominal) types. The DNS12xx Series DC/DC converters will operate at full load from 10Vin to 14Vin for 12Vin (nominal) types.
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Page 7: Load Regulation
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. - Page 8 8.2.4 Output Voltage Set-point Programming (1) Output Voltage Set-Point Adjustment by external resistor Output Voltage Set-point Programming can be carried out by using the external program resistor connect between TRIM pin to ground to set output voltage set-point from 0.75Vdc to 5Vdc, the location can refer to the Evaluation Board Schematic (please refer to the data sheet for more detailed specification).
- Page 9 Table 2. Vo,set Rset (k 0.7525 Test 1. Put the resistor to program the desired output voltage set point by follow Table 1 and Table 2 for the standard output. 2. Set the input voltage to the desired operating level while monitoring DVM2. 3.
- Page 10 For DNS12xx series − × Vtrim 0667 Vout For example, to program the output voltage of a DNS12 module to 3.3 Vdc, Vtrim is calculated as follows − × − Vtrim 0667 Table 4. : Vo,set adjustment range by use of external voltage source. Product Part DNS12S0A0S06P A/B/C DNS12S0A0S06N A/B/C...
- Page 11 8.2.6 Voltage Tracking The DNS 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, ratio-metric and simultaneous. TRACK simplifies the task of supply voltage tracking in a power system by enabling modules to track each other, or any external voltage, during power-up and power-down.
- Page 12 Figure 4: Sequential Power up 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 method that is implemented. To simplify the tracking design, set initial value of R2 equal to 20KΩ at internal circuit and set resistor R1 for different tracking method.
- Page 13 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 negative. The waveforms of power up and down are showed in Figures 7 and 8. ∆...
- Page 14 For example, the PS1 Vo set,PS1 − − ) 3 . PS1=5V PS2=3.3V - △ V=1.3V Figure 9. Ratio–metric tracking Power up Simultaneous Implementation Similar to the ratio-metric implementation, simultaneous tracking is implemented by using a voltage divider on the TRACK pin. The objective is to minimize the voltage difference between the power supply outputs during power up and down.
- Page 15 For type C (DNXXX0A0XXXX C), the simultaneous tracking can be accomplished by putting R1 equal to 30.1K Ω through Vo to the TRACK pin of PS2. Figure 12 shows the circuit diagram of Simultaneous start-up when Vo ENABLE Figure 12. PS1 and PS2 track output voltage Simultaneous start-up for type C Figure 13.
- Page 16 Notes on the use of Track function: 1. For proper voltage tracking, first, The ENABLE On/Off pin of the PS2 module is left 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.
- Page 17 Test (Turn on the module by using the external switch) 1) Turn on the fan. 2) Turn on the input power supply and set it to the desired operating point. 3) Set channel 1 on the oscilloscope to be DC coupled and to the appropriate range for the input voltage.
- Page 18 5. Set channel 2 on the oscilloscope to be DC coupled and to the appropriate range for the output voltage. 6. Connect a coaxial cable from channel 2 to BNC2 on the Evaluation Board. 7. Set the Time base to 2mS/Div 8.
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Page 19: Appendix A- Evaluation Board Schematic
Appendix A- Evaluation Board Schematic... -
Page 20: Appendix B - Evaluation Board Layout (Top View)
Appendix B - Evaluation Board Layout (Top View) Appendix C - Evaluation Board Layout (Bottom View) CONTACT DATA: www.deltaww.com USA: Telephone: East Coast: (888) 335 8201 West Coast: (888) 335 8208 Fax: (978) 656 3964 Email: DCDC@delta-corp.com 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.
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