Delta Electronics DNL Series 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.

Evaluation Procedure

EP_DNML_SMD_08062004

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.

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

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

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.

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).

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 maximum +/- 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 maximum +/- 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.

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 the detailed specification). These test functions are divided into two types,

Rset of DNM04S and DNL04S series can be calculated by using the following equation:











−

−

=5110

7525.0

21070

Rset

Ω

For example, to program the output voltage of the DNL04S module to 1.8Vdc, below is the

calculation of Rtrim:

150045110

7525.08.1

21070 =











−

−

set

Ω

The table 1 provides the Rset value required for some standard output and the location on the

Evaluation board is R33.

Table 1.

Vo,set Rset (k

Ω

) R33 Recommend Value, R//R

0.7525 Open Open

1.2 41.973 44.2k//825k

1.5 23.077 23.7k//825k

1.8 15.004 15.4k//590k

2.5 6.947 7.15k//243k

3.3 3.160 3.16k//Open

Rset of the DNM12S and DNL12S series can be calculated by using the following equation:











−

−

=1000

7525.0

10500

Rset

Ω

For example, to program the output voltage of the DNL12S module to 3.3Vdc, below is the

calculation of Rset:

31221000

7525.03.3

10500 =











−

−

set

Ω

The table 2 provides the Rset value required for some standard output. The location on the

Evaluation board is R33.

Table 2.

Vo,set 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

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. Turn on the fan.

4. Set the enable switch SW2 to the “ON” position to enable the converter.

5. Adjust the output load across the converter’s operating load range.

6. Note the output voltage over the full range of the operating load range (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 source, connect it

between the TRIM pin and GND pin. Please refer to the Table 3 and Table 4 as below for

the appropriate Vout. The value of Vtrim is specified as follows:

For DNM04xx and DNL04xx series

()

7525.01698.07.0

−

×−= VoutVtrim

For example, to program the output voltage of a DNL04S module to 3.3 Vdc, Vtrim is

calculated as follows:

()

VVtrim 267.07525.03.31698.07.0

−

×−=

Table 3. : Vo,set adjustment range using external voltage source.

Product Part

Normal

Output Set

Voltage

(Vdc)

Vrim (V)

0.7525 Open

1.2 0.6240

1.5 0.5730

1.8 0.5220

2.5 0.4030

DNM04S0A0S10P A/B/C

DNM04S0A0S10N A/B/C

DNL04S0A0S16P A/B/C

DNL04S0A0S16N A/B/C

3.3 0.2670

For DNM12xx and DNL12xx series

()

7525.00667.07.0

−

×−= VoutVtrim V

For example, to program the output voltage of a DNL12S module to 3.3 Vdc, Vtrim is

calculated as follows

()

53.07525.03.30667.07.0

−×−=Vtrim V

Table 4. : Vo,set adjustment range using external voltage source.

Product Part

Normal

Output Set

Voltage

(Vdc)

Vrim (V)

0.7525 Open

1.2 0.670

1.5 0.650

1.8 0.630

2.5 0.583

3.3 0.530

DNM12S0A0S10P A/B/C

DNM12S0A0S10N A/B/C

DNL12S0A0S16P A/B/C

DNL12S0A0S16N A/B/C

5.0 0.4167

8.2.5 Voltage Margining

Output voltage margining can be carry out by connecting a resistor from the Trim pin to ground

pin for trim up and connecting a resistor from Trim pin to Output 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 voltage margining calculation is available to ask for. The values of Rmargin-

up and Rmargin-down for a specific output voltage and margin percentage can then be figured

out. Please consult your local Delta Field Application Engineer or sales persons for additional

information.

Test

1) Put the resistor with desire of the voltage trim.

2) Turn on the fan.

3) Adjust the input voltage while monitoring DVM2 and with output load set to the desired

operating point.

4) Set the enable switch SW2 to the “ON” position to enable converter.

5) Use SW3 (refer to Item 7.1_6) for Trim setup.

6) Note the voltage by observing DVM3.

7) Test the Load Regulation (refer to Item 8.2.2).

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