IPM Series
Evaluation Procedure
(DEP-003)
The IPM- C Series POL converters
The IPM Series, single output, non-isolated
point of load DC/DC converters, are the latest
offering from a world leader in power systems
technology and manufacturing ― Delta
Electronics, Inc. They operate from
a
3V~5.5V (IPM04C) or an 8V~14V (IPM12C)
source and provide a programmable output
voltage of 0.8V to 3.3V(IPM04C) or 0.8V to
5V(IPM12C). With creative design technology
and optimization of component placement,
these converters possess outstanding
electrical and thermal performance, as well
as offering extremely high reliability under
highly stressful operating conditions. All
models are protected against abnormal
input/output voltage and current conditions.
1.0Purpose
This document guides the user in performing
electronic measurements on an IPM POL (point
of load) DC/DC converter using the Delta
Evaluation Board.
This document guides the user through the
evaluation procedure to qualify a POL module.
The data shown in this Evaluation Procedure
is for the SIP and SMT Package Type POL
evaluation board. Please refer to the
appropriate technical data sheet for detailed
performance and technical information for the
specific POL units.
2.0 Relevant Documentation
The documentation and background information
listed below is relevant to this evaluation
procedure:
․ Applicative date sheets for IPM Series unit
under evaluation.
․ Power Module Evaluation Board Schematic.
․ Power Module Evaluation Board Layout.
․ General Test and Safety Procedures.
Evaluation Procedure
EP_IPMC_04292005
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Delta Electronics, Inc.
4.1 Connect one lead from the “+” lead of the power supply to the “20A” terminal of the first
multimeter DMM1. Then connect one lead from the “Common” of the DMM1 to the “Vin” pin of
the Evaluation Board. Set function of DMM1 to DCA to measure the input current.
4.2 Connect one wire from the “-” lead of the power supply (Item 3.1) to the “Vin-“ 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.
4.3 Connect the plus “+” and minus “-“ connection leads from a second multimeter to the “SVin+”
and “SVin-” Pins on the Evaluation Board. This multimeter is designated DMM2 to measure the
input voltage.
4.4 Connect the plus “+” and minus “-“ connection leads from the third multimeter to the “SVout+”
and “SVout-” Pin on the Evaluation Board. The multimeter is designated DMM3. DMM3 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 (item 3.2). This cable is used to measure the input voltage
(between SVin+ and SVin-).
4.6 Connect a BNC cable (length less than 20 inches/500mm) from BNC2 of the Evaluation Board
to Channel 2 of the oscilloscope. This cable is used to measure the output voltage (between
SVout+ and SVout-).
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 “-Vout” for the negative power lead).
4.8 For IPM04C series: Open J2 on the Evaluation Board. Connect one lead from the “+” lead of the
power supply to the “12Vcc” on the Evaluation Board. Then connect one lead from the “-” of
the power supply to the “12VGND” on the Evaluation Board. For IPM12C: short J2 on the
Evaluation Board.
5.0 Thermal Management of the Converter
It is imperative that sufficient airflow should be provided to the converter at all times during all
portions of testing. Please refer to the applicative data sheet for the proper cooling and derating
necessary to achieve accurate results when testing the converter.
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6.0 Tests Performed
The following tests are performed at room temperature (+25 C).
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 Adjustment Range.
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: IPM12C0A0S04A and IPM04C0A0S06A would denote the SMT
package, while IPM12C0A0R04A and IPM04C0A0R06A would denote the SIP package.
This Evaluation Board can be used for both packages.
2) Set multimeter DMM1 to the DC current 20A range. Set multimeters DMM2 and DMM3
to DC voltage, auto ranging.
3) Electronic Load
Turn on the Electronic Load (or resistive load) and adjust the current level. The maximum
rated output current is 4A for the model IPM12C0A0R04A series and 6A for the model
IPM04C0A0R06A series. Ensure the output load does not exceed the recommended
maximum current.
4) SW1 is used to enable or disable the converter. Turn SW1 to the OFF position to enable
the converter, and turn SW1 to the ON position to disable the converter.
5) SW2 is used for On/Off Transient function test. Turn SW2 to the OFF position if this
function is not being used. Turn SW2 to the ON position if the Transient function test is
required.
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6) SW3 is used for the trim-down or trim-up setting of the Output Voltage. For IPM, if the
converter requires a trim up, set SW3 to the Trim-up position. If the converter requires a
trim down, set SW3 to the Trim-down position. For normal operating, turn off the SW3.
7) SW4 and SW5 are used for the Output Voltage Set-Point Adjustment by external
resistors. For IPM12C0A0R04A, if the converter requires a trim-up to 5V, set the SW4_1
to ON position and SW3 to trim-up position. If the converter requires a trim-down to 0.8V,
set the SW5_8 to ON position and SW3 to trim-down position.
8) For constant output voltage module, if the converter requires a trim-up, set the SW4_2 to
ON position and SW3 to trim-up position. If the converter requires a trim-down, set the
SW5_8 to ON position and SW3 to trim-down position. Please refer to the Function
Tables below for the setting details.
SW4 Function Table
Subdivide switch NO.
For adjustable output
module
For constant output
module
SW4_1
SW4_2
SW4_3
SW4_4
SW4_5
SW4_6
SW4_7
SW4_8
5.0V setting
3.3V setting
2.5V setting
1.8V setting
1.5V setting
1.2V setting
5.0V trim up
3.3V trim up
2.5V trim up
1.8V trim up
1.5V trim up
1.2V trim up
1.0V trim up
0.9V trim up
1.0V setting
0.95V setting
Note: Settings of SW4_1 and SW4_7 are for IPM12C series only
SW5 Function Table
Subdivide switch NO.
For adjustable output
module
For constant output
module
SW5_1
SW5_2
SW5_3
SW5_4
SW5_5
SW5_6
SW5_7
SW5_8
-
5.0V trim down
3.3V trim down
2.5V trim down
1.8V trim down
1.5V trim down
1.2V trim down
1.0V trim down
0.9V trim down
-
-
-
-
-
-
0.80V setting
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7.2 Initial Power Up
1) Turn the power supply ON, set the current limit on power supply (refer to specification of
either converter) and increase the input voltage (use DMM2 to monitor the voltage) until it
reaches the desired value.
2) Set the switch SW1 to “OFF” position to enable the power module.
3) The converter is now operating, which can be verified by observing the DMM3 (appropriate
value for the nominal output voltage) and channel 2 of the oscilloscope (appropriate value
for the nominal output voltage).
4) Set the switch SW1 to the “ON” position after performing each test.
8.0 Tests and Evaluation
8.1 Input Characteristics
8.1.1 Input Voltage Range and Under-Voltage Lockout
The IPM04C Series of DC/DC converters will operate at full load from 3.0Vin to 5.5Vin. For
the output of 3.3V, the input voltage range is from 4.0Vin to 5.5Vin. The IPM12C Series
DC/DC converters will operate at full load from 8Vin 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 DMM2.
3) Set the switch SW1 to the “OFF” position to enable the converter.
4) Test the input under voltage function while observing DMM2, DMM3 and channel 1 of the
oscilloscope. Increase the input voltage until the output of the converter reaches the
appropriate value. This will occur between 2.40 and 2.70 volts for IPM04C modules and
between 7.6 to 8.0 volts for IPM12C modules. 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 DMM2.
3) Set the switch SW1 to the “OFF” position to enable the converter.
4) Remove/disable the output electronic load or resistive load.
5) Note the input current from DMM1.
6) The result is the No-Load Input current of the DC/DC converter.
The No-Load Input Current will be around 20 to 85mA for the IPM12C series and around
20 to 70mA for the IPM04C series depending on the model under evaluation. (Please
refer to the data sheet for the detailed specification).
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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 SW1 to the “OFF” position to enable the converter.
4) Adjust the input voltage across the converter’s input range (refer to specified range) while
monitoring DMM2.
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 changes 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 DMM2.
3) Set the switch SW1 to the “OFF” position to enable the converter.
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 SW1 to the “OFF” position to enable the converter.
3) Adjust the input voltage while monitoring DMM2 and set the output load to the full rated
load current.
4) Adjust channel 2 on the oscilloscope to be AC coupled at 1µS/Div and 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.
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8.2.4 Output Voltage Set-Point Adjustment Range (Trim)
Output Voltage Set-Point Adjustment can be carried out by using an external resistor or
external voltage source to increase or decrease the output voltage set-point (please refer to
the data sheet for the detailed specification). Refer all trim voltage requirements to Item 7.1-6,
7.1-7, 7.1.8, and refer all the design numbers to Evaluation Board Schematic.
(1) Output Voltage Set-Point Adjustment by using an external resistor
For IPM12C series
To implement Trim-up by using an external resistor, R
must be connected between the
trim-up
TRIM pin and ground. For IPM12C0A0R04A, Please refer to the IPMR table for the desired
Vout. The value of R can be calculated by the following equation and the datasheet can
trim-up
also be referred for further information.
3.752
− 0.9
Rtrim−up
=
− 0.261 kΩ
V
out
To implement Trim-down by using an external resistor, R
must be connected between
trim-down
the TRIM pin and Vout. For IPM12C0A0R04A, Please refer to the IPMR table for the desired
Vout. The value of R can be calculated by the following equation and the datasheet
trim-down
can also be referred for further information.
1.072
Rtrim−down
=
−5.621 kΩ
0.9 −V
out
IPMR: Rtrim values versus some commonly used Vout for IPM12C0A0R04A.
Vout
0.800
0.900
1.0
Rtrim (Ω)
5.09K
Open
37.2K
12.2K
5.98K
3.90K
2.08K
1.30K
653
1.2
1.5
1.8
2.5
3.3
5.0
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For IPM04C series
To implement Trim-up by using an external resistor, R
must be connected between the
trim-up
TRIM pin and ground. For IPM04C0A0R06A, Please refer to the IPMR table for the desired
Vout. The value of R can be calculated by the following equation and the datasheet can
trim-up
also be referred for further information.
7.0
− 0.9
Rtrim−up
=
− 0.187 kΩ
V
out
To implement Trim-down by using an external resistor, R
must be connected between
trim-down
the TRIM pin and Vout. For IPM04C0A0R06A, Please refer to the IPMR table for the desired
Vout. The value of R can be calculated by the following equation and the datasheet
trim-down
can also be referred for further information.
2.0
Rtrim−down
=
−10.187 kΩ
0.9 −V
out
IPMR: Rtrim values versus some commonly used Vout for IPM04C0A0R06A.
Vout
0.8
0.9
1.2
1.5
1.8
2.5
3.3
Rtrim (Ω)
9.813K
Open
23.146K
11.479K
7.590K
4.188K
2.729K
Test
1) Turn on the fan.
2) Adjust the input voltage while monitoring DMM2 and with output load set to the desired
operating point.
3) Set the enable switch SW1 to the “OFF” position to enable converter.
4) Use SW3, SW4 and SW5 (refer to Item 7.1_7) for Trim setup.
5) Note the voltage by observing DMM3.
6) Test the Load Regulation (refer to Item 8.2.2).
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(2) Output Voltage Set-Point Adjustment by using an external voltage source
For IPM12C series
Output voltage of IPM12C is programmable while applying a voltage between the TRIM
and GND pins. The following equation can be used to determine the value of Vtrim
needed for a desired output voltage Vo:
Vtrim = 0.7439 – 0.0488Vo
Vtrim is the external voltage in V
Vo is the desired output voltage
For example, to program the output voltage of a IPM
module to 3.3 Vdc, Vtrim is calculated as follows:
Vtrim = 0.7439 – 0.0488 x 3.3
= 0.5829V
For IPM04C series
Output voltage of IPM04C is programmable while applying a voltage between the TRIM
and GND pins. The following equation can be used to determine the value of Vtrim
needed for a desired output voltage Vo:
Vtrim = 0.7168 – 0.0187Vo
Vtrim is the external voltage in V
Vo is the desired output voltage
For example, to program the output voltage of a IPM
module to 3.3 Vdc, Vtrim is calculated as follows:
Vtrim = 0.7168 – 0.0187 x 3.3
= 0.655V
Figure 2. Configuration for programming output voltage using an external voltage source
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8.3 Dynamic Characteristics
8.3.1 Output Voltage Deviation
Output Voltage Deviation is defined as the response of the converter to a sudden step change
in the output load current. The output voltage deviation is characterized by two parameters:
Maximum Output Voltage Deviation and Response Time (please refer to the data sheet for the
detailed specification). The value of dynamic resistance for a defined step current is defined as:
Vout
Rdynamic
=
0.5* Imax
Test
1) Turn 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 Rdynamic
.
5) Set the switch SW1 to the “OFF” position to enable the converter.
6) Set channel 2 on the oscilloscope to be AC coupled and to 50mV/Div and for 50uS/Div. Set
the trigger to auto and adjust the trigger point at a negative going pulse for step load
change from 50% to 100% of Io or adjust the trigger point at positive going pulse for step
load change from 100% to 50% (Please refer to data sheet)
7) Measure the Peak deviation and capture the waveform as required.
8.3.2 Turn-On Transient Time
Turn-On Response Time is defined as the time it takes for the output to rise to within 90% of its
final value from the time when the converter is enabled. The rise time is deliberately made
slower to reduce the inrush current and to eliminate any overshoot in the output voltage. These
test functions have two categories.
1) Turn on the module by using the External switch to control input voltage.
2) Turn on module by using the Enable on/off.
Note: There is a difference in performance in each mode - please refer to the data sheet for
the detailed specification.
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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.
4) Connect a coaxial cable from channel 1 to BNC1 on the Evaluation Board.
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 5mS/Div
8) Set the Trigger mode to normal trigger and set the Trigger level at approximately 2V (rising)
or suitable trigger point (referring to data sheet) on channel 2.
9) Turn on the external switch to supply power source to module and use the cursor V Bars of
Scope to measure the delay time, and then record the waveform on the oscilloscope.
Test (Turn on the module by using the Enable on/off)
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 1V/division. (Refer to data
sheet).
4) Connect a scope probe from channel 1 between the on/off control pin and reference
ground (SGND) on the Evaluation Board.
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 5mS/Div
8) Set the Trigger mode to normal trigger and set the Trigger level at approximately 2V (rising)
or suitable trigger point (referring to data sheet) on channel 2.
9) Turn on-off Enable switch (SW1) and use the cursor V Bars of Scope to measure the delay
time, and then record the waveform on the oscilloscope.
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) Set the enable switch SW1 to the “OFF” position to enable the converter.
3) Adjust the input voltage to the desired operating point.
4) Set the electronic or resistive Load to the desired operating point.
5) Read and note the output voltage (DMM3) and input voltage (DMM2).
6) Read and note the input and output currents from the DMM1 and the electronic load.
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7) Use the following formulas to calculate the efficiency:
Efficiency= (Pout/Pin) × 100(%)
Pin = Iin × Vin
Pout = Iout × Vout
For IPM12C series
The following graph shows the efficiency results of the IPM12C0A0R04A converter measured at
different operating points, the output voltage was set at 5V.
100
90
Vi=14V
80
70
Vi=12V
Vi=10V
Vi=8V
1
2
3
4
LOAD (A)
For IPM04C series
The following graph shows the efficiency results of the IPM04C0A0R06A converter measured at
different operating points, the output voltage was set at 3.3V.
95
Vin=5.5V
Vin=5.0V
Vin=4.0V
85
75
1
2
3
4
5
6
LOAD (A)
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Appendix A- Evaluation Board Schematic
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Appendix B - Evaluation Board Layout (Top View)
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Appendix C - Evaluation Board Layout (Bottom View)
CONTACT: www.delta.com.tw/dcdc
USA:
Asia & the rest of world:
Telephone: +886 3 4526107 ext 6220
Fax: +886 3 4513485
Europe:
Telephone:
Phone: +41 31 998 53 11
Fax: +41 31 998 53 53
Email: DCDC@delta-es.com
East Coast: (888) 335 8201
West Coast: (888) 335 8208
Fax: (978) 656 3964
Email: DCDC@delta-corp.com
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 furnished by Delta is believed to be accurate and reliable. However, no responsibility is assumed by Delta for
its use, nor for any infringements of patents or other rights of third parties, which may result from its use. No license is
granted by implication or otherwise under any patent or patent rights of Delta. Delta reserves the right to revise these
specifications at any time, without notice.
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