Delta Electronics DNS SIP Series User's Manual
Contents
1. chit 1 00V alae 1007 zooms A Chi 7 1 30 V chi T 00 Jd T 00V Md0 0ms A Chi 1 30 V 23 Dec 2003 23 Dec 2003 50 00 12 33 49 51 40 12 34 28 Figure 9 Ratio metric tracking Power up Figure 10 Ratio metric tracking Power down 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 The waveforms of power up and down are showed in Figures 13 and 14 For type A DNXXXOAOXXXX A the simultaneous tracking can be accomplished by connecting Vops to the TRACK pin of PS2 Figure 11 shows the circuit diagram of voltage Simultaneous start up when Vopsz tracks Vops only for type A PS1 PS2 Figure 11 PS1 and PS2 track output voltage Simultaneous start up for type A Z For type C DNXXXOAOXXXX C the simultaneous tracking can be accomplished by putting R1 egual to 30 1KQ through Vops to the TRACK pin of PS2 Figure 12 shows the circuit diagram of Simultaneous start up when Vopsz tracks the Vops only for type PS1 PS2 Vops2 To Tracking circuit dil 1 00V wch 1 00V M20 0ms A Chi X 1 30 V dil 1 00V amp ch2 1 00V Md 00ms A Chi 1 30 V 23 Dec 2003 12 04 50 00 13 08 22. 33 1 6485 1212 Fax 886 3 4513485 West Coast 888 335 8208 Germany 49 89 370 62 897 Email DCDC delta com tw Fax 978 656 3964 UK 44 777 195 6299 Email DCDC delta corp com Fax 33 1 6485 1212 Email DCDC euro 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 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 an time without notice
3. Examine the part number of the power module to determine that the correct module is being evaluated Note DNS04S0A0S06P A would denote the SMT package while DNS04S0A0R06P A would denote the SIP package This Evaluation Board is for use with SIP package Set the multi meter DVM1 to the DC current 20A range Set multi meters DVM2 and DVM3 to DC voltage auto ranging Electronic Load Turn on the Electronic Load at CR mode or resistive load and adjust the current level The maximum rated output current is 6A Ensure the output load does not exceed the recommended maximum current 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 reguired Z 9 6 SW2 is used to enable or disable the converter For positive logic module When SW2 is put in the ON position the converter is ON and when SW2 is put in the OFF position the converter is OFF For negative logic module When SW2 is put in the OFF position the converter is ON and when SW2 is put in the ON position the converter is OFF SWS is used for the Output Voltage Set Point Adjustment Range By an external voltage source If the converter requires a trim up set the SW3_1 to ON position If the converter requires a trim down set the SW3_2 to ON position By an external resistor If the converter requires a trim up to Vo set set the SW3_8
4. VY Evaluation Procedure DEP 008 A The Delphi DNS Series of SIP type POL converters The DNS 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 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 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 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 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 App
5. For example to program the output voltage of the DNS12 module to 3 3Vdc below is the calculation of Rset r 8500 _ _g00 31220 3 3 0 7525 The table 2 provides the Rset value reguired for some standard output The location on the Evaluation board is R33 Z Table 2 Vo set Rset k Q 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 Set the input voltage to the desired operating level while monitoring DVM2 Turn on the fan Set the enable switch SW2 to the ON position to enable the converter Adjust the output load across the converter s operating load range Note the output voltage over the full range of the operating load range please refer to the data sheet for the detailed specification ob Oh 2 Output Voltage Set Point Adjustment by external voltage source For DNS 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 DNS04xx series Vtrim 0 7 0 1698 x Vout 0 7525 For example to program the output voltage of a DNS04 mo
6. load to the full rated load current 4 Adjust channel 2 on the oscilloscope to be AC coupled at 4uS 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 detailed specification These test functions are divided into two types Rset of DNSOAR series can be calculated by using the following equation 21070 5110 O Vo 0 7525 For example to program the output voltage of the DNS04 module to 1 8Vdc below is the calculation of Rtrim z 21070 se 11 8 0 7525 s110 15004 Q 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 Q 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 DNS12R series can be calculated by using the following equation R 10500 i goo Q Vo 0 7525
7. to ON position If the converter requires a margin trim down set the SW3_3 to ON position If the converter requires a margin trim up set 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 must set to OFF position 7 2 Initial Power Up 1 2 3 4 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 Set the switch SW2 to power module ON 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 Set the switch SW2 to power module OFF Z 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 The c
8. 4 apoo Figure 13 Simultaneous Power up Figure 14 Simultaneous Power down Table 5 Vref Definition Voset ps2 Vref 0 7525 0 3 1 2 0 48 1 5 0 6 1 8 0 72 2 5 1 0 3 3 1 32 5 0 2 0 VY 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 The TRACK pin is held at ground potential for duration of input voltage reaches its minimum input voltage VIN min and then held for at least 10mS thereafter This brief period gives the modules time to complete their internal soft start initialization 2 The PS2 output will not follow the PS1 voltage until the PS2 has completed its soft start time After this time PS2 is capable of both sinking and sourcing current when following the voltage at the TRACK pin 3 Notice that power down by removing the input voltage may not provide proper power tracking below under voltage lockout limit where the both integrated switches are off So using the ENABLE On Off signal of PS1 for power down is the preferred option for power tracking 4 The TRACK pin absolute maximum voltage cannot over the Vin 5 For type A When Tracking is unused put R1 equal to 1KQ2 and connect TRACK pin to Vcc m For type C When Tracking is unused put R1 e
9. T 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 Z 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 lt 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 2 3 4
10. ame time use equation 1 to calculate R1 set A V VOset psi VOsetps2 and AV will be negative The waveforms of power up and down are showed in Figures 7 and 8 _ V0 Ps2 AV Vref Vref Rl Note 1 Vref 0 4xVOsetpso please refer to Table 5 for Vref set value 2 AV is the maximum difference of voltage between PS1 and PS2 supply voltage For example the PS1 Vosetips175V the PS2 Vosetips273 3V R1 is calculated as follows _ G341 7 1 32 7 1 32 RI 20K 55 75K Q Chit 1 00V na T 00V uM2 00ms A Chi 1 30 V chil T00V Si ip T 00 V ooms A Chi E 1 30 V 23 Dec 2003 23 Dec 2003 50 00 12 05 41 50 00 12 06 27 Figure 7 Ratio metric tracking Power up Figure 8 Ratio metric tracking Power down For Ratio Metric applications that need the PS2 supply voltage rises first at power up and falls second at power down use equation 2 to calculate R1 set AV lt 0 4 VOsetpso and AV will be negative The waveforms of power up and down are showed in Figures 9 and 10 set ps2 AV Vref 20K YU a 2 Vref Ae Vo Note 1 Vref z0 4xVosetps2 please refer to Table 5 for Vref set value 2 AV is defined as the voltage difference between Vops and Vopsz when Vops2 reaches its rated voltage Z For example the PS1 Vosetps175V the PS2 Vosetps273 3V R1 is calculated as follows _ G3 13 132 7 1 32 Rl 20K 10 303K Q
11. dule to 3 3 Vdc Vtrim is calculated as follows Vtrim 0 7 0 1698 x 3 3 0 7525 0 267V Table 3 Vo set adjustment range by use of external voltage source Normal Product Part Output Set rim v Voltage Vdc 0 7525 Open 1 2 0 6240 DNSO4SO0AORO6P A B C 1 5 0 5730 DNS04S0AORO6N A B C 1 8 0 5220 2 5 0 4030 3 3 0 2670 For DNS12xx series Vtrim 0 7 0 0667 x Vout 0 7525 V For example to program the output voltage of a DNS12 module to 3 3 Vdc Vtrim is calculated as follows Vtrim 0 7 0 0667 x 3 3 0 7525 0 53 V Table 4 Vo set adjustment range by use of external voltage source Normal Product Part Output Set rim v Voltage Vdc 0 7525 Open 1 2 0 670 1 5 0 650 DNS12S0A0S06P A B C 18 0 630 DNS12S0AOSO6N A B C i d 2 5 0 583 3 3 0 530 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 co
12. e 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
13. es its final 5V steady state value the open collector output of the PWRGD pin releases to the TRACK pin and the PS2 output voltage rises at the rate of the RC time constant In Figure 5 the PWRGD pin pull low by PS1 ENABLE off or the PS1 output voltage is below 90 of the desired regulated voltage and then the TRACK pin is pulled low and the PS2 power down Figure 3 shows the circuit diagram of sequential start up when Vopsz tracks the PWRGD of PS1 PS1 PS2 Figure 3 PS1 and PS2 track output voltage Sequential start up ai 1 00V scho 1 00V Md0 0ms A Ch2 x 1 64 V Sil 1 00V Ch 2 25 Mar 24 64 00 21 35 35 40 20 21 3 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 method that is implemented To simplify the tracking design set initial value of R2 equal to 20KO at internal circuit and set resistor R1 for different tracking method Figure 6 shows the circuit diagram of Ratio Metric start up when Vopsz tracks the Vops1 PS Fee To Tracking circuit ENABLE ENABLE R2 Figure 6 PS1 and PS2 track output voltage Ratio Metric start up For Ratio Metric applications that need the PS1 and PS2 outputs arrive regulation set point at s
14. for 5mS 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 lo or adjust the trigger point at positive going pulse for step load change from 100 to 50 Please refer to data sheet for the detailed information 7 Measure the Peak to Peak deviation and capture the waveform as reguired dynamic 8 3 2 Turn On Response 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 m 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 2mS Div 8 Set the Trigger for a one time event and set the Trigger le
15. input voltage to the desired operating point Set the electronic or resistive Load to the desired operating point Read and note the output voltage DVM3 and input voltage DVM2 m Read and note the input and output currents from the DVM1 and the electronic load Use the following formulas to calculate the efficiency Efficiency Pout Pin x 100 Pin lin x Vin Pout lout x Vout The following graph shows the efficiency curves of the DNS04S0A0R06P A module when measuring at different operating points 100 19 T NOLLdO 5x cn S01J9S VqN 10 dn ulsaeury NA sallas ydN JO uMOp ulsiewy dn ui21eury uMop uiBgeury 1n0A UMOp WTI A wg uey UCMS bdl d O SL ONS E EESO SE 44O NO 24A1J N E Z 4A4O NO Ansood Z 8 cecol 440 NO INGISNVEL 2 eddy 403 Buryoray 1 g UI y od J 10 Furyorsy z g gt saldes VdN ur asn uo UNE seu 8SuZ LSY Secor t Er 8 a 9SN Y 1N3ISNVN1 12 z9 eco LNOA say O O DEP 008 Bnc en BNC1 2975021900 J cs co Q201 Mh Bs je LUD 3 2 Tracking for Type A 2 1 Tracking for Type o ew mow O B A TRANSIENT LOAD sws Appendix C Evaluation Board Layout Bottom View JB 18 w8 CONTACT DATA www deltaww com USA Europe Asia Telephone Telephone Telephone 886 3 4526107 x6220 East Coast 888 335 8201 France
16. nsult your local Delta Field Application Engineer or sales persons for additional information Test 1 Connect a trim resistor for a desired voltage value Please refer to Table 1 and Table 2 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 Z 8 2 6 Voltage Tracking The DNS family was designed for applications that have output voltage tracking reguirements during power up and power down The devices have a TRACK pin to implement three types of tracking method seguential 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 By connecting multiple modules together customers can get multiple modules to track their output voltages to the voltage applied on the TRACK pin Detailed Description Sequential Implementation Sequential start up is implemented by connecting the power good signal PWRGD pin of PS1 to the TRACK pin of PS2 with a resistor capacitor RC circuit The waveforms of power up and down are in Figures 4 and 5 In Figure 4 the 5V PS1 supply ramps up first When supply reach
17. onverters 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 Z 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 th
18. qual to 30 1KQ and connect TRACK pin to Vcc m Test 1 Put R56 to take the place of R1 on the POL evaluation board and use the value from above equation for different tracking purpose 2 Use channel 1 and channel 2 measures the output voltage of PS1 and PS2 3 For turn on disable remote On Off of the PS1 enable remote On off of the PS2 and supply input voltage to PS1 and PS2 4 For the power on enable switch on of PS1 In the meantime to track power up by scope trigger function 5 For the power down enable switch off of PS1 to track power down 6 Illustration of tacking features can be found in the section of Detailed Description 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 dynamic 0 5 Imax a m 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 R 9 Setthe switch SW2 to the converter ON 6 Set channel 2 on the oscilloscope to be AC coupled and to 50mV Div and
19. ropriate 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 Bd NELTA Delta Electronics Inc Z 3 0 Eguipment Reguired 3 1 ADC Power Supply 0 20 V 0 20A Agilent 6574A 0 60V 0 35A or equivalent 3 2 An oscilloscope Tektronix TDS 3034 or eguivalent 4 Channel 300 MHz eguipped 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 20 for reference designators cited in this document and Figure 1 Set up Diagram DVM eaii Cwt To DVM l m mn 4 SGND SVIN O DEP OO8 BNc2 e2 BNC1 2975021900 C c22 s Lead Of The Power Supply To Electronics Load 123 je TP1 somes MWM fi mex 3 2 Trocking for Type A Common Of The DVM1 2 1 Tracking for Type C 12VCC 12VGND Mi TRIM ON OFF O Electronic or Resistive DC Power Load at 50 of Maximum Supply 12V Load Figure 1 Set up Diagram Z 4 1 Connec
20. t 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 SVOU
21. vel at approximately 2V rising or suitable trigger point referring to data sheet on channel 2 9 Enable the external on off switch to supply power and use the cursor V Bars 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 Please also refer to data sheet for the detailed information 4 Connect a scope probe from channel 1 between the on off control pin and reference ground SGND on the Evaluation Board me 17 oN Set channel 2 on the oscilloscope to be DC coupled and to the appropriate range for the output voltage Connect a coaxial cable from channel 2 to BNC2 on the Evaluation Board Set the Time base to 2mS Div Set the Trigger for a one time event and set the Trigger level at approximately 2V rising or suitable trigger point referring to data sheet on channel 2 Enable the on off switch to turn on and use the cursor V Bars 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 Turn on the fan Set the enable switch SW2 to the converter ON Adjust the
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