Delta Electronics DNL User Manual

Evaluation Procedure

(DEP-002 A)

The Delphi DNM and DNL Series of SMT 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 offering from one of the world’s largest power supply manufacturers ― Delta Electronics, Inc. The DNM and DNL product family also has a flexible, programmable tracking feature, which provides a variety of startup voltages as well as sequencing and tracking between power modules. With creative design technology and optimization o component placement, these converters possess outstanding electrical and thermal performance, as well as extremely high reliability under highl stressful operating conditions. All models 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 Package Type POL evaluation board. Please refer to the appropriate data shee for detailed performance and technical information for the specific POL units.

DNM, DNL SMT Series

1.0 Purpose

This document guides the user in performing electronic measurements on a DNM and DNL 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 DNM or DNL Series unit.

2.2 Power Module Evaluation Board Schematic.

2.3 Power Module Evaluation Board Layout.

2.4 General Test and Safety Procedures.

Evaluation Procedure EP_DNML_SMD_08062004

Delta Electronics, Inc.

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 and DVM3) (Zentech 2041 or equivalent).

3.4 An electronic load (Chroma 63030 or equivalent), 300W approximate rating, or a suitable resistive load.

3.5 A DC power supply (GW GPC-3060D).

4.0 Equipment Set-Up and Description

Refer to the Power Module Evaluation Board Layout (See page 19) for reference designators cited in this document and Figure 1. Set-up Diagram.

Figure 1. Set-up Diagram

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 “-” lead of the DC source (See Item 3.1) to the “GND“ pin of the

Evaluation Board. Note: Use stranded leads at least equivalent to 14 AWG for all connections in sections 4.1 and 4.2. The leads should be twisted to reduce noise coupling.

4.3 Connect the plus “+” and minus “-“ connection leads from a second multi-meter (See Item 3.3)

to the “SVin” and “SGND” pins on the Evaluation Board. This multi-meter is designated DVM2. DVM2 is used to measure the input voltage.

4.4 Connect the plus “+” and minus “-“ connection leads from the third multi-meter (See Item 3.3) to

the “SVOUT” and “SGND” Pin on the Evaluation Board. The multi-meter is designated DVM3. DVM3 is used to measure the output voltage.

4.5 Connect a 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 Connect a BNC cable (length less than 20 inches/500mm) from BNC2 of the Evaluation Board to Channel 2 of the oscilloscope (See Item 3.2). This cable is used to measure the output voltage (between SVOUT and SGND).

4.7 Connect the positive and negative power leads of the electronic load (ensuring correct polarity), or an appropriate resistive load to the Evaluation Board output terminal pin (“Vout” for positive power lead and “SGND” for the negative power lead).

4.8 Connect one lead from the “+” lead of the DC source (See Item 3.5) to the “12Vcc” on the Evaluation Board. Then connect one lead from the “-” of the DC source (See Item 3.5) to the “12VGND” on the Evaluation Board.

5.0 Thermal Management of the Converter

It is imperative that sufficient airflow needs to 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 conditions to obtain accurate results when testing the converter.

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).  Turn on Response time.

6.4 Thermal Characteristic

 Efficiency

7.0 Test Set-Up

7.1 Initial Set-Up

1) Examine the part number of the power module to determine 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 package.

2) Set the multi-meter DVM1 to the DC current 20A range. Set multi-meters DVM2 and DVM3 to DC voltage, auto ranging.

3) Electronic Load Turn on the Electronic Load at CR mode (or resistive load) and adjust the current level. The maximum rated output current is 10A for the model DNM series and 16A for the DNL series. Ensure the output load does not exceed the recommended maximum current.

4) SW1 is used for on/off Transient function test. Turn SW1 to the OFF position if this function is not being used. Turn SW1 to the ON position if the Transient function test is required.

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) SW3 is used for the Output Voltage Set-Point Adjustment Range. By an external voltage source: If the converter requires a trim up, push the SW3_1 to ON position. If the converter requires a trim down, push the SW3_2 to ON position. By an external resistor: If the converter requires a trim up to Vo,set, push the SW3_8 to ON position. If the converter requires a margin trim down, push the SW3_3 to ON position. If the 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

Note:

1. The subdivide switch of SW3_1~4 must not be ON at the same time.

2. For the SW3_5~7 use at NPA series, so must push 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.

2) Set the switch SW2 to power module ON.

3) The converter is now operating, which can be verified by observing the DVM3 (appropriate value for the nominal output voltage) and channel 2 of the oscilloscope (appropriate value for the nominal output voltage).

4) Set the switch SW2 to power module OFF.

SW3_1 Voltage trim up SW3_2 Voltage trim down SW3_3 Resistor margin trim down SW3_4 Resistor margin trim up SW3_8 Resistor trim up

8.0 Tests and Evaluation

8.1 Input Characteristics

8.1.1 Input Voltage Range and Under-Voltage Lockout

The DNM04xx and DNL04xx Series of DC/DC converters will operate at full load from 2.4Vin to 5.5Vin for 5Vin (nominal) types. The DNM12xx and DNL12xx Series DC/DC converters will operate at full load from 10Vin to 14Vin for 12Vin (nominal) types. The converters feature input under-voltage protection, which will not allow the converter to start up unless the input voltage exceeds the turn-on voltage threshold.

Test

1) Turn on the fan.

2) Set the input voltage to the desired operating point while monitoring DVM2.

3) Set the switch SW2 to the “ON or OFF” position to enable the converter. (See 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 value. This will occur between 2.05 and 2.25 volts for 5Vin nominal and between 9.0 to 10 volts for 12Vin nominal. Please refer to the appropriate converter data sheet for the detailed specification.

8.1.2 No Load Input Current Test

1) Turn on the fan.

2) Set the input voltage to the desired operating point while monitoring DVM2.

3) Set the switch SW2 to the converter ON.

4) Remove/disable the output electronic load or resistive load.

5) Note the input current from DVM1.

6) The result is the No-Load Input current of the DC/DC converter. The No-Load Input Current will be around 50 to 150 mA depending on the model under evaluation. (Please refer to the data sheet for the detailed specification).

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