EVBUM2227 - 25VT6A5VGEVB Evaluation Board User`s Manual
Contents
1. 90 85 EFFICIENCY 80 Ta 70 0 5 10 19 20 29 LOAD CURRENT A Figure 5 Efficiency of NTTFS4H07N x NTMFS4HO02NF for Viy 12 V Vout 1 2 V Vppy 5 V Fsw 500 kHz Top Gate A Phase Node Bottorn Gate Ch1 5 04 Ch2 5 04 M 40 0ns 1 25GS s_ IT 80 0ps pt Ch3 5 0 amp Chi z 6 64 Figure 6 Switch Node and Gate Waveforms of NTTFS4H07N x NTMFS4H02NF taken at lour 20 A 4 30 2014 3 www onsemi com2. Vin re established Shut down Procedure VOUT 0 8 V 1 56 V L 2 3 Shut down the load Reduce the input voltage to zero and then shut down the input power supply Reduce the driver voltage and controller voltage to zero Then shut down the driver power supply and controller power supply Shut down Procedure VOUT 1 56 V 1 8 V 2 Shut down the load Adjust the potentiometer until the output voltage measures 1 56 V 4 30 2014 2 Reduce the input voltage to zero and then shut down the input power supply Reduce the driver voltage and controller voltage to zero Then shut down the driver power supply and controller power supply Test Procedure L A Before making any connections make sure to set all power supplies to 0 V and make sure the load current isO A Connect the oscilloscope probes at the desired test points Connect the voltmeters multi meters to monitor the required parameters refer to Figure 4 Set the output voltage to 1 2 V and the input voltage to 12 V following the Start Up Procedure specified in the previous section Obtain the required data and waveforms Follow the Shut Down Procedure specified in the previous section www onsemi com ON Semiconductor TEST RESULTS The following test results were obtained for the 25VT6A5 VGEVB evaluation board by following the Test Procedure listed above The selected MOSFETs were evaluated in a 1 x 1 combination 100
3. ON Semiconductor Test Procedure for the 25VT6A5VGEVB Evaluation Board 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 Vec Vin Controller Vee H3 Driver b z _ PWM Signal ae Vout MOSFET Driver Additional Vout Adjust VID Control CPA stetetetstotets N LS Driver MOSFETs Phase Node Figure 4 Schematic of the Test Setup Start up and Shut down Procedures method is to toggle Pin 8 EN of the Grayhill switch Before starting the test the oscilloscope probes should be SW2 to 0 down position and then back to 1 up connected IR or k type thermo couples can be used to position The second method is to set VIN to 0 V monitor the temperature of the parts IR monitoring requires and then back up to the desired voltage then turned the removal of the oscilloscope probes due to the IR beam on and Vin re established interference Start up Procedure VOUT 1 56 V 1 8 V Start up Procedure VOUT 0 8 V 1 56 V 1 Initially set all the power supplies to 0 V 1 Initially set all the power supplies to O V 2 Set the output voltage to 1 56 V by changing the VID 2 Set the output voltage to the desired value by changing settings on SW2 see Appendix The SW2 must be the VID settings on SW2 see Appendix The SW2 changed while the driver and co
4. ntroller are off must be changed while the driver and controller 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 inptut voltage to the desired value 8 V 16 V 8 V 16V 5 Vour Adjustments the output voltage may be fine tuned 5 Adjust the output voltage using the R60 at this time by adjusting the R60 potentiometer potentiometer until the desired output voltage is 6 Set the load current to the required value The load reached 1 8 V maximum current must be incremented slowly to prevent the 6 Set the load current to the required value The load controller from shutting down due to transient spikes on current must be incremented slowly to prevent the the inductor current sense lines CS1 CS2 in Figure 2 controller from shutting down due to transient spikes If the controller shuts down there are two different on the inductor current sense lines CS1 CS2 in methods that can be used to reset the controller The first Figure 2 If the controller shuts down there are two 4 30 2014 1 www onsemi com ON Semiconductor different methods that can be used to reset the controller The first method is to toggle Pin 8 EN of the Grayhill switch SW2 to O down position and then back to 1 up position The second method is to set VIN to 0 V and then back up to the desired voltage then turned on and
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