ON Semiconductor Dynamic Load Tool Evaluation Board User`s
Contents
1. other enable on the DLT After the square wave is enabled the DLT load step will increase the load using the DC load as a starting point 7 Remove the DVM from the Isense pins and attach a differential probe 8 Verify that the voltage the scope is reading via the diff probe is the same as that seen on the DVM If not calibrate the scope and differential probe before proceeding further 9 Enable the function generator s output http onsemi com DLT100AGEVB 10 Slowly increase the load by turning the STEP pot clockwise until you reach the desired load step 11 Once the desired load step is obtained you can adjust the load s trailing and leading edge slew rate by adjusting the function generator s square wave output voltage level Increase the voltage to increase the slew rate DO NOT exceed 2 V pk pk or the DLT s amplifier may be damaged 12 Adjust the square wave s frequency to test at different load repetitive rates 13 The function generator s output can be changed to Pulse to test at different duty cycles At higher load switching frequencies with slower slew rates it may be necessary to increase the generators duty cycle to allow for full load step swing External Static Load While the DLT is capable of providing a static load it is advisable to use a separate load in parallel if higher loads are needed If there isn t enough room to connect a second external load directly to the board bein2. DLT100AGEVB ON Semiconductor Dynamic Load Tool Evaluation Board User s Quick Step Guide ON Semiconductor http onsemi com EVAL BOARD USER S MANUAL What you will need to use the DLT Multichannel Oscilloscope 12 V 600 mA Power Supply with Cables to Connect to DLT Adjustable Voltage and Switching Frequency Square Wave Function Generator Two Differential Scope Probes or One Differential Probe and 50 Q Terminated Passive Probe Coax Cable to Attach Function Generator to Scope s External Trigger Small Screwdriver to Adjust Trimmer Pots Semiconductor Components Industries LLC 2012 April 2012 Rev 0 Attaching the DLT to your circuit e Make the Connection to Your Board As Close As Possible to Where your Actual Load Will Be Placed e Make the Connections to Your Board As Short As Possible Any Added Wire Between the DLT and the Circuit Under Test Will Increase Inductance and Reduce the di dt Capability of the DLT e Observe the Polarity of the DLT s Connection Tabs Publication Order Number EVBUM2101 D DLT100AGEVB 7 Figure 2 DLT Attached to Interposer with Header Pins Choosing the Load Range The dynamic load tool is equipped with two load range settings High amp Low The high load range offers the ability to load more power Typically 55 W total and has a current monitor resolution of 5 mV A The low load range has a lower loading power ability Typically 12 W total but has
3. Literature Distribution Center for ON Semiconductor P O Box 5163 Denver Colorado 80217 USA Phone 303 675 2175 or 800 344 3860 Toll Free USA Canada Fax 303 675 2176 or 800 344 3867 Toll Free USA Canada Email orderlit onsemi com N American Technical Support 800 282 9855 Toll Free ON Semiconductor Website www onsemi com USA Canada Europe Middle East and Africa Technical Support Phone 421 33 790 2910 Japan Customer Focus Center Phone 81 3 5817 1050 Order Literature http www onsemi com orderlit For additional information please contact your local Sales Representative EVBUM2101 D
4. a higher current monitor resolution of 25 mV A The low load range setting allows for better accuracy when monitoring low load conditions It is important to enable only one of the loading options at a time If both options are enabled then both drive circuits will operate This will not cause any damage to the DLT however both banks will be producing loads and both load current sense lines would need to be monitored and their respective current representation would need to be summed in some manner The two load ranges have separate load sense monitoring points These are located just below the DLI s operation selector switches ATTENTION Disabling the High or Low Load section does not fully disconnect them There will still be a low leakage current from the disabled drive stage Tr Figure 3 High Current Selected 5 mV A Figure 5 Current Monitor Sense Points Supplying Operational Power to the DLT The DLT is powered by an external power supply It will operate with an input supply of 10 V 18 Vdc The typical input needed would be a 12 V supply capable of supplying gt 600 mA The input power is attached to the DLT in the upper left hand corner via TPWR3 amp TPWR4 or via the optional Molex Connector Molex part 39 29 3046 Figure 6 Input Power Connection Connecting the Function Generator A 50 Q coax cable with EZ Clips can be used to attach the function generator to the two pin connector on the DLT with two ways
5. al This allows more control over the dynamic load and custom profiles can be created It will also require a more advanced input signal generator to provide an adjustable slew rate e Internal Drive Direct Drive Input Signal 2 V pk pk Square O to 1 V Pulse Wave or Pulse Low Voltage of Drive Signal Lower Load Set By DC Pot High Load Set By Step Pot High Voltage of Drive Signal Drive Signal s Amplitude Drive Signal s Slew Rate Operating the DLT To operate the DLT attach it to the circuit you will be testing and connect the scope function generator and 12 V supply as outlined above It is recommended the following process be done the first time the DLT is used on each circuit This will help prevent a possible load condition which may be undesirable with an improperly tuned feedback loop 1 Turn cooling fan speed to full Clockwise and both DC Load and Step Load pots to lowest settings Counter clockwise 2 Set the drive and load range switches to desired settings 3 Apply power and enable the circuit that you will be testing 4 Apply the 12 Vdc to power the DLT You should see the green power LED light up 5 Don t enable but adjust the function generator s settings for a 400 mV pk pk 1 kHz square wave 6 Using a DVM to monitor the voltage on the Isense pins slowly adjust the DC load pot to the desired lower load level High Icc 5 mV A or Low Icc 25 mV A Doing this applies load without any
6. amages Typical parameters which may be provided in SCILLC data sheets and or specifications can and do vary in different applications and actual performance may vary over time All operating parameters including Typicals must be validated for each customer application by customer s technical experts SCILLC does not convey any license under its patent rights nor the rights of others SCILLC products are not designed intended or authorized for use as components in systems intended for surgical implant into the body or other applications intended to support or sustain life or for any other application in which the failure of the SCILLC product could create a situation where personal injury or death may occur Should Buyer purchase or use SCILLC products for any such unintended or unauthorized application Buyer shall indemnify and hold SCILLC and its officers employees subsidiaries affiliates and distributors harmless against all claims costs damages and expenses and reasonable attorney fees arising out of directly or indirectly any claim of personal injury or death associated with such unintended or unauthorized use even if such claim alleges that SCILLC was negligent regarding the design or manufacture of the part SCILLC is an Equal Opportunity Affirmative Action Employer This literature is subject to all applicable copyright laws and is not for resale in any manner PUBLICATION ORDERING INFORMATION LITERATURE FULFILLMENT
7. g tested which is the best practice it may be connected directly to the DLT at pins PWR2 amp PWR3 However any additional current pulled through these points will decrease the load current that the DLT is capable of drawing due to additional heat generated through the board Thermal Considerations The DLT is equipped with a fan which when running at full speed is capable of providing enough cooling to dissipate roughly 55 W total power It is recommended that the cooling fan be run at full speed The DLT is also equipped with thermal protection circuits on both the high and low load banks If the operational board temperature reaches the predetermined point the DLT will stop drawing any load until the temperature drops Once it drops to a safe temperature the DLT will again start drawing load During the time that the DLT is in thermal protection the corresponding High or Low drive HOT LED will light ON Semiconductor and W are registered trademarks of Semiconductor Components Industries LLC SCILLC SCILLC reserves the right to make changes without further notice to any products herein SCILLC makes no warranty representation or guarantee regarding the suitability of its products for any particular purpose nor does SCILLC assume any liability arising out of the application or use of any product or circuit and specifically disclaims any and all liability including without limitation special consequential or incidental d
8. to drive it 1 By using an arbitrary waveform generator Use the Direct Drive two pin connector and select EXT drive When using this drive option the signal generator can be set to provide a drive signal that is a replica http onsemi com 2 DLT100AGEVB of the desired load pattern For example if the high power range is used 5 mV A and a load step between 5 A and 60 A is desired then the generator needs to provide a voltage signal between 25 mV and 300 mV and also have the desired frequency and rise time Direct Drive Figure 7 Direct Drive Drives DLT Load Amps Directly EXT Drive INT Drive A Figure 8 Direct Drive Switch Selection 2 By using a standard bipolar signal generator Use the FUNC GEN IN two pin connector and select INT drive When using this drive option the bipolar signal produced by the generator is internally processed by the DLT in order to obtain the desired load pattern The levels of the load step are set by the two potentiometers on the DLT board while the slew rate is set by adjusting the amplitude from the signal generator FUNCT GEN IN aF MAX 2VPP Figure 10 Internal Drive Switch Selection The oscilloscope can be triggered from the load current signal but it is recommended that the external trigger on the function generator be used As mentioned the load amplifiers can be driven directly The load will proportionally follow the voltage of the input drive sign
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