EVBUM2227 - 25VT6A5VGEVB Evaluation Board User's Manual
Contents
1. board by following the Test Procedure listed above The selected MOSFETs were evaluated in a 1 x 1 combination 100 95 90 85 EFFICIENCY 80 75 70 0 5 10 22 20 29 LOAD CURRENT A Figure 5 Efficiency of NTTFS4H07N x NTMFS4H02NF for Vy 12 V Vout 1 2 V Vpny 5 V Fsw 500 kHz Ch ame Ghz DY M 40 0ns 1 25654 IT 80 0ps pt Ch3 O A Chl s 6 6 Figure 6 Switch Node and Gate Waveforms of NTTFS4HO07N x NTMFS4HO2NF taken at lour 20 A http onsemi com 7 25VT6A5VGEVB APPENDIX Table of AMD VID Settings for NCP5386B Controller The Grayhill 76PSBO8ST 8 position switch used for setting the output voltage of the synchronous buck converter Figure 7 below shows the pin assignment of the switch VIDO VIDS set the output voltage DAC and EN is the enable pin of the controller controller reset EN must always be in the up position 1 unless a reset is performed To set the output voltage to 1 2 V for example VIDO 0 down VID1 VID2 VID3 1 up VID4 0 down and VIDS DAC EN 1 up Table 3 VID CONTROL SETTINGS FOR OUTPUT VOLTAGE PIN 1 PIN 2 PIN 3 PIN 4 PIN 5 PIN 6 PIN 7 PIN 8 VIDO VID1 VID2 VID3 VIDA VID5 DAC EN Vout V Tolerance 0 0 0 0 0 1 1 1 1 5625 0 596 http onsemi com 8 25VT6A5VGEVB N v o e e e Pin Diagram of NCP5386B Controller 29 28 27 26 25 1 VID1 24 2 vip2 23 3 VID3 22 4 viD4 21 5 NCP2. can be connected at various test points such as high side gate JS6 low side gate JS10 switch node JS8 the driver PWM Signal JS11 Vin sense J9 amp J10 and Vout sense J11 amp J12 http onsemi com 25VT6A5VGEVB TEST SET UP AND PROCEDURE Test Setup The test set up test points and components present on the The MOSFET parts placed on the evaluation board are the Q1 25VT6A5VGEVB Evaluation Board are shown in Figure 4 and Q4 Refer to Figure 1 Driver Vcc Vin Controller C HS e _ mg Driver EI l um PWM Signal igna e T MOSFET Driver Additional Vour Adjust VID aes Control 7m Nowsvh ko LS Driver MOSFETs Phase Node Figure 4 Schematic of the Test Setup Start up and Shut down Procedures reset the controller The first method is to toggle Before starting the test the oscilloscope probes should be Pin 8 EN of the Grayhill switch SW2 to 0 connected IR or k type thermo couples can be used to down position and then back to 1 up position monitor the temperature of the parts IR monitoring requires The second method is to set VIN to 0 V and then the removal of the oscilloscope probes due to the IR beam back up to the desired voltage then turned on and interference Vin re established Start up Procedure VOUT 0 8 V 1 56 V Start up Procedure VOUT 1 56 V 1 8 V 1 Initially set all the power supplies to 0 V 1 Initially set all the power supplies to 0 V 2 Set the ou
3. 25VTGA5VGEVB 25VTGA5VGEVB Evaluation Board User s Manual Description The 25VT6A5 VGEVB evaluation board is designed such that it can accommodate a 1x1 to a 2x2 combination of MOSFETs for u8 FL and SOS FL packages Depending on the type of application and necessity any combination of the above packages can be used The 25VT6ASVGEVB evaluation board is designed to operate with an input voltage ranging from 8 V to 16 V and to provide an output voltage of 0 8 V to 1 8 V for load currents of up to 25 A The 25VT6ASVGEVB comes with a 5 V driver The 25VT6ASVGEVB evaluation board has a number of test points that can be used to evaluate its performance in any given application Features e 5 V to 16 V Input Voltage e 25 A of Steady State Load Current e 500 kHz Switching Frequency Access to IC Features such as Enable Switching Node and VID Settings for Output Voltage CETT Ll DERI CRT O u wre Wit wit Vis w amp x a a x x Ir a z Semiconductor Components Industries LLC 2014 April 2014 Rev 1 Figure 1 25VT6A5VGEVB Evaluation Bo ON Semiconductor http onsemi com EVAL BOARD USER S MANUAL e Convenient Test Points for Simple Non invasive Measurements of Converter Performance Including Input Ripple Output Ripple High Side and Low Side Gate Signals and Switching Node Applications e Synchronous Buck Converters High Frequency Applications High Current Appl
4. 5386 A B m 1 2 Phase Buck Controller 6 viD6 QFN32 19 Pee AGND Down Bonded to 18 g DACMODE Exposed Flag 17 5 1 2 2 a8 OTS 2 2 Figure 8 Top View of the Pin Diagram of NCP5386B Switching Frequency of the Oscillator The switching frequency of the oscillator can only be For more information on NCP5386B see Data Sheet of changed by changing the resistors R13 and R14 NCP5386B ON Semiconductor and uJ are registered trademarks of Semiconductor Components Industries LLC SCILLC SCILLC owns the rights to a number of patents trademarks copyrights trade secrets and other intellectual property A listing of SCILLC s product patent coverage may be accessed at www onsemi com site pdf Patent Marking pdf 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 damages 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 ex
5. 75 2175 or 800 344 3860 Toll Free USA Canada Phone 421 33 790 2910 LL Fax 303 675 2176 or 800 344 3867 Toll Free USA Canada Japan Customer Focus Center For additional information please contact your local Email orderlit onsemi com Phone 81 3 5817 1050 Sales Representative EVBUM2227 D
6. Description Monitoring the Input Voltage The input voltage can be monitored by using the test points at J9 and J10 on the 25VT6ASVGEVB evaluation board This allows the user to find out the exact value of input voltage since there will be no losses from the cables or connectors Monitoring the Output Voltage The 25VT6ASVGEVB evaluation board provides two test points for measuring the output voltage without any losses from the cables or connectors The output voltage can be measured at the points J11 and J12 on the evaluation board Monitoring the Switch Node Waveforms The 25VT6A5VGEVB evaluation board provides the opportunity to monitor the switch node waveforms The probe socket at test point JS8 provides the switch node waveforms Monitoring the High Side and Low Side Waveforms The high side waveforms can be obtained from the probe socket at test point JS6 and the low side waveforms can be obtained from the probe socket at test point JS10 The probe sockets that are provided on the evaluation board for monitoring the waveforms are such that the oscilloscope probes can be inserted into the probe socket and are held in place The Test Point and the Probe Socket are shown in Figure 3 Monitoring the PWM Signal The PWM signal from the controller to the driver can be monitored from the probe socket provided at JS11 Maii i Probo Ground Lannnector Probe 5unal Connector Figure 3 Tektronix Test Point amp Probe Sock
7. et Part 700503100 TEST EQUIPMENT REQUIRED Voltage Sources i DC Supply Source for Input Voltage The input voltage source should be a 0 to 20 V DC source The input voltage may be increased further depending on the parts that are being used on the 25VT6ASVGEVB evaluation board such that the part can withstand the applied voltage Hence based on the required input voltage to be applied the requirement of the DC power supply varies it DC Supply Source for Driver Voltage The supply source for the driver should be a 0 to 10 V source The driver voltage should never exceed 6 5 V Electronic Load The electronic load supplied to the 22 VTG6ASVGEVB evaluation board ranges from 0 A to 25 A Hence a DC current source of 0 A to 30 A is needed for the evaluation board Meters to Measure Voltages and Currents In the 25VT6A5VGEVB Evaluation Board the voltages that are to be measured are Vin Vout and Vdrv The set up for measuring these voltages are shown in Figure 4 The connecting wires from the output terminal to the electronic load should be thicker in order to avoid losses and to measure the exact voltage at the end of the terminals Oscilloscope The oscilloscope is used to monitor the gate and switch node waveforms This should be an analog or digital oscilloscope set for DC coupled measurement with 50 MHz bandwidth The resolution can be set at 5 V division vertically and 20ns division horizontally The oscilloscope channels
8. ications Low Duty Cycle Applications e Multi phase Synchronous Buck Converters e Evaluation Board has only One Phase Implemented Mc a E l l i E gt my JET 94V 0 09 SITE r SEIN ard Publication Order Number EVBUM2227 D 2PINTTERM BLK 25VT6A5VGEVB EVALUATION BOARD SCHEMATIC 3 3 i I a E s i 3 ag D al s 33 O O 330ul cis Cis cis C16 cis 22uF 22uF 22uF 22uF 22uF cr2 22uF C25 ae MBRS230LT3 2 zx o co gt A xz 2 JL ZEE M n o a a Figure 2 Schematic of the 25VT6A5VGEVB Evaluation Board http onsemi com 2 25VT6A5VGEVB ELECTRICAL SPECIFICATIONS Table 1 ELECTRICAL SPECIFICATIONS FOR 25VT6A5VGEVB Input Characteristics Tee aes A AA IL BEL i NN LR RR CUNT Neledinputcument Vin 12 V lout 0 A Vdrvr Output Characteristics Output Voltage Vin 12 V lout 25 A 5V Vp p Maximum Switch Node Vin 12 V lout 20 A Vdrvr Voltage System Characteristics Peak Efficiency Vin 12 V Vout 1 2 V Vdrvr EIET Full load efficiency Vin 12 V Vout 1 2 V Vdrvr 5 V lout 25 A ENLZEXEA The output voltage can be adjusted by changing the VID settings See Appendix 1 The switching frequency is defined by the resistors R13 and R14 and can only be changed only by changing the resistors R13 and R14 CONNECTORS AND TEST POINTS DESCRIPTIONS Inpu
9. perts 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 N American Technical Support 800 282 9855 Toll Free ON Semiconductor Website www onsemi com Literature Distribution Center for ON Semiconductor USA Canada P O Box 5163 Denver Colorado 80217 USA Europe Middle East and Africa Technical Support Order Literature http www onsemi com orderlit Phone 303 6
10. t Power defined in Table 1 The 25VT6A5VGEVB evaluation board Connect the input voltage positive probe to Pin 1 of J1 and is set up to accept DENS footprints of ON Semiconductor sense probe at J9 negative probe to the GND at Pin 2 of J1 5 V drivers and sense probe at J10 The input voltage can range from 8 V to 16 V Switching Frequency The converter switching frequency is set by the voltage Output Power divider setup of R13 and R14 between the pins 10 ROSC Connect the output voltage positive probe to J13 large and 33 AGND of the NCP5386 controller In order to screw connector and sense probe at J11 ground probe at J14 change the frequency these resistors have to be changed large screw connector and the sense probe to J12 The Changing the frequency also changes the lim Over Current output voltage is set by the VID settings SW2 and the shutdown threshold settings potentiometer R60 Please refer to Start Up Procedure and Appendix Table 2 R13 R14 1 RESISTOR VALUES FOR FREQUENCY SET green ree p a Frequency kH R13 kQ R14 kQ Connect the positive probe to Pin 2 of J5 and the negative eee a Un probe to the GND at Pin 1 of J5 Please keep this as a separate supply to avoid damage to the controller especially when other drive voltages are used Driver Biasing The driver positive voltage probe Vcc should be connected to both pin 1 and 2 of J6 The driver voltage is http onsemi com 3 25VT6A5VGEVB Test Points
11. tage and controller voltage to Pin 8 EN of the Grayhill switch SW2 to 0 zero Then shut down the driver power supply and down position and then back to 1 up position controller power supply The second method is to set VIN to 0 V and then back up to the desired voltage then turned on and Vin re established Test Procedure 1 Before making any connections make sure to set all power supplies to 0 V and make sure the load Shut down Procedure VOUT 0 8 V 1 56 V current is 0 A 1 Shut down the load 2 Connect the oscilloscope probes at the desired test 2 Reduce the input voltage to zero and then shut points down the input power supply 3 Connect the voltmeters multi meters to monitor 3 Reduce the driver voltage and controller voltage to the required parameters Refer to Figure 4 zero Then shut down the driver power supply and 4 Set the output voltage to 1 2 V and the input controller power supply voltage to 12 V following the Start Up Procedure Shut down Procedure VOUT 1 56 V 1 8 V ud iue P TEVIS SOCON icis dosnahe bd 5 Obtain the required data and waveforms 6 Follow the Shut Down Procedure specified in the 2 Adjust the potentiometer until the output voltage i i previous section measures 1 56 V 3 Reduce the input voltage to zero and then shut down the input power supply http onsemi com 6 25VT6A5VGEVB TEST RESULTS The following test results were obtained for the 25 VT6A5VGEVB evaluation
12. tput voltage to the desired value by 2 Set the output voltage to 1 56 V by changing the changing the VID settings on SW2 see VID settings on SW2 see Appendix The SW2 Appendix The SW2 must be changed while the must be changed while the driver and controller driver and controller are off are off 3 Set the driver voltage and controller voltage to 5 V 3 Set the driver voltage and controller voltage to 5 V 4 Set the input voltage to the desired value 4 Set the input voltage to the desired value 8 V 16 V 8 V 16 V 5 Vout Adjustments the output voltage may be 5 Adjust the output voltage using the R60 fine tuned at this time by adjusting the R60 potentiometer until the desired output voltage is potentiometer reached 1 8 V maximum 6 Set the load current to required value The load 6 Set the load current to required value The load current must be incremented slowly to prevent the current must be incremented slowly to prevent the controller from shutting down due to transient controller from shutting down due to transient spikes on the inductor current sense lines CS1 spikes on the inductor current sense lines CS1 CS2 in Figure 2 If the controller shuts down CS2 in Figure 2 If the controller shuts down there are two different methods that can be used to there are two different methods that can be used to http onsemi com 5 25VT6A5VGEVB reset the controller The first method is to toggle 4 Reduce the driver vol
Download Pdf Manuals
Related Search