Half-chip PRM®-RS Customer Board User Guide
Contents
1. E Assembly Drawing P O 7 a DI P O a TI 0 LOLE PC a a fe fa En VOUT IN Blus VOUT n S 3 Pos Top side View GND VIN ENABLE p A o LL Ra Ro O Ne gt lt VICOR PowerBench UG 008 vicorpower com Applications Engineering 800 927 9474 Page 6 Table 1 Half chip PRM RS Customer Board BOM VICOR PowerBench 4 3 Bill of Materials Ref Des Description Manufacturer a kart umber C01 ot Applied ot Applied Not Applied C02 Not Applied ot Applied Not Applied C05 CAP ALEL 100uF 20 63 V 0 2 radial U CHEMI CON EKME630EII101MJC5S C07 CAP X7R 0 01uF 10 100 V 0603 Generic Generic C08 ot Applied ot Applied Not Applied C10 Not Applied ot Applied Not Applied C11 CAP X7R 0 01uF 10 100 V 0603 Generic Generic C12 CAP X7R 0 10uF 10 16 V 0603 Generic Generic C13 CAP X7R 0 22uF 10 25 V 0603 Generic Generic C14 Not Applied ot Applied Not Applied F1 Littlefuse 10 Amp R451010 MRL Littlefuse 0451010 MRL JO1 ack Vertical Mech Thru Hole Tektronix 131 5031 00 LO2 nd 0 1u 20 20A dual 3026 Coilcraft SLC7530D 101MLC PSO1 odel Specific Vicor Model Specific Q02 C Sense INA194 SOT23 5 Tl INA194 RO2 ot Applied Not Applied Not Applied RO3 RES 1K OHM 1W 1 10W 1 0603 Generic Generic ROS RES Sense2. 11 Record Disable waveform Adjust scales as necessary 12 Monitor for switch bounce Repeat measurement or adjust setup as necessary 9 5 Current Limit Note In order for this test to be performed properly a resistive load must be used This includes an electronic load set to constant resistance mode Be cautious of potential load interactions when using electronic loads If the output voltage or current begin to oscillate repeat the test with a passive resistive load l 2 3 Apply input source and load Set to OFF If using an electronic load change to Constant Resistance mode Connect DMMs to measure Vout IF and any other signals to be measured i Use electronic load reading clamp on DC meter to measure approximate output current or calibrated shunt for more accurate measurement Set S01_2 to Left position to enable the device 5 Apply input voltage Verify output is present VICOR PowerBench Enable load Gradually ramp up current decrease resistance until current limit threshold is reached i Current will remain at maximum output voltage will fold back UG 008 vicorpower com Applications Engineering 800 927 9474 Page 15 10 0 Advanced Modifications 10 1 Stability Bandwidth and Transient Response The nominal compensation of the half chip PRM RS Customer Board is set to provide relatively low bandwidth in order to ensure stability under all of the recommended configurations The closed loop frequency re
3. 8m OHM 1W 1 2512 Generic Generic RO9 RES O OHM Jumper 1A 0603 Generic Generic R10 RES 10 OHM 1 4W 1 1206 Generic Generic R16 RES 17 4K OHM 1 4W 1 1206 Generic Generic R22 RES TRIM POT 10K OHM 1 4W 10 SMD Murata PVG5A103C03R00 R23 RES 1 24K OHM 1 4W 1 1206 Generic Generic R24 ot Applied Not Applied Not Applied R25 ot Applied Not Applied Not Applied R27 RES 0 OHM 1 8W 5 1206 Generic Generic R28 RES 1K OHM 1 4W 1 1206 Generic Generic R29 ot Applied Not Applied Not Applied R30 RES 1 24K OHM 1 4W 1 1206 Generic Generic R31 RES 10K OHM 1 4W 1 1206 Generic Generic R32 Not Applied Not Applied Not Applied R40 RES 54 9K OHM 1 4W 1 SMD 1206 Generic Generic R42 RES 4 99K OHM 1 4W 1 1206 Generic Generic S01 SW DIP SPST 2 POS C amp K SDO2HOB TPO1 TPO2 TPO3 TPO4 Test Point Surface Mount Keystone 5017 TPO5 TP10 TP11 U03 IC VREF 1 25V REF3312 SOTZ3 3 Tl REF3312 U09 IC DUAL OPAMP LM6142AIM 8PIN SO National LM6142AIM OS CONN 10POS 90 Thru Hole Female 0 100SPC Sullins PPTCO52LIBN RC ACCESSORY 1 HS XF 11mm Half VIC Vicor 32784 ACCESSORY 2 Clip Heat sink Grounding Vicor 33855 ACCESSORY 3 CONN 10POS Header STR M M 3A 0 100 Sullins PECO5DABN ACCESSORY 4 Push Pin White 0 063 Vicor 34141 UG 008 vicorpower com Applications Engineering 800 927 9474 Page 7 5 0 VTM Customer Boards The half chip PRM RS Customer Board is designed to work with all types of VTM Customer Boards to facilitate testing of virtually any PRM VTM combination Note
4. VTM Customer Board the sense leads may be wired to the VTM output voltage through X03 depending on which VTM board is used If not a twisted pair of wires can be used to connect sense leads to the VTM board output from these test points VICOR PowerBench UG 008 vicorpower com Applications Engineering 800 927 9474 Page 4 Schematic 4 0 Schematic Assembly and Bill of Material BOM 4 1 AST 1 J0Je nboy ZLEEIIY GND A Al Try JA I LLdL a NadO SA 6 Y WL OEY SA SA zi Nido SA vey wal Eee OldL LNOWNUd H ane AYS Oty m 11 OLY LOD K NIA 9071 OLY S ez LOS NOA HML 0 7201 v Pano hon No Hoy vOd za Lad LOSd po poo 0dL qa Ne NIA 00L OLLE INOWHd Di 0d rox JE cise sos OLO L0Z67 ss wg 804 i Nr P3 FNIA 80dL vOdL ZOdl 90d L LOW Zod a DN EDN AN GND ZOH 0Y n Sldl 2075 zou vldl T ud OZZZE jno WIA Du L NO ray e nan O D mh lt x Zldl WI dA WW EF pai iwi SA 0xX SA 90H L0H JS JA La eon L y Z dIa MS LOS Dd Page 5 UG 008 vicorpower com Applications Engineering 800 927 9474 Figure 3 Half chip PRM RS Customer Board Schematic VICOR PowerBench 4 2 Assembly Drawing Figure 4 Half chip PRM RS 2 Customer Board
5. that there are currently two basic types of VTM Customer Boards Both board types share many common features including input capacitance output capacitance and various test points The main difference between the two board types is the number of connectors Before configuring a PRM VTM setup the user should identify which type of VTM board is being used 5 1 VTM Customer Board Type A Single Connector The VTM Customer Board Type A contains a single power signal header designed to mate with only X01 on the half chip PRM RS Customer Board The PRM output voltage and VC signal are transferred through this header when connected to a PRM Customer Board Figure 5 VTM Customer Board Type A e CO ve Wi Hire Fadponpzr NI ee Y e ly j N 0UT N 0UT H VTM CB PN 34280 Figure 6 VTM Customer Board Type A Connector Pinout Front View VTM CUSTOMER BOARD TYPE A Power Sianal Connector VICOR PowerBench UG 008 vicorpower com Applications Engineering 800 927 9474 Page 8 5 2 VTM Customer Board Type B Dual Connectors The VTM Customer Board Type B contains dual connectors designed to mate with both X01 and X03 on the half chip PRM RS Customer Board The additional connector is used to transfer VTM signal pins as well as the VS and VS signals between boards The VS and VS signals are tied directly to the VTM output and can be used for implementing remote sense as described in a later section IN OUT E Vi
6. the input lugs Verify proper polarity Set to O Volts or OFF before connecting 8 Connect VTM output to desired load using the output lugs Set load to O Amps or OFF VICOR PowerBench UG 008 vicorpower com Applications Engineering 800 927 9474 Page 12 9 Insert oscilloscope probe into VTM output probe jack 10 Connect DMM to the VTM output test points and to any other signals to be measured 11 Set PC Enable Switch SO_2 to the left position 12 Apply nominal input voltage 13 Measure VTM output voltage and verify operation 14 Use the output voltage trim pot R22 to adjust the output to the desired level a Do not trim below the minimum input voltage of the VTM used 15 Apply 100 load and verify full load operation 16 Turn off load and power Proceed to following sections for detailed test procedure Figure 11 Half chip PRM RS Customer Board connection to VTM Customer Board Type A FACTORIZED POWER of PN 35307 E 1 2 PRM RS CB em gr VS VOUT H VTM CB PN 34280 Du DA ee oG vo aa O PC UTM O TM UTM y Figure 12 Half chip PRM RS a Customer Board Connection to as iit mM out mt am ouT VTM Customer Board Type B mm PC SENSE SENSE w TM JINS a x ri nn ROG al Vici 4 un ROS TS 1 1 7 POWER T PN 35307 H 17 2 PRM RS CB MM yo r YS Dm n cu de T UIN TEA zo A gt f B UTM CB a y e fed Us fi m Bipot PN 35079 VICOR PowerBench UG 008
7. 29 set the gain and limit the maximum VTM output voltage based on Equation 1 assuming the trim pot R22 is fully clockwise OPEN E AA Pro UT A TP10 1 R23 A R24 T V s Figure 10 Remote Sense j A E Vs Configuration E vs R30 R29 1 24k Ve TP11 Equation 1 V 1 24kQ Ro R QUT_ZSETMAX _ 24 29 Y OUT _SET MAX 1 25V Where Vout_sermax is the maximum VTM output trim voltage 8 3 1 PRM VTM Remote Sense Setup This is NOT the nominal configuration of the customer board and requires rework to implement 1 Determine the maximum desired VTM output trim voltage R22 fully clockwise 2 Use Equation 1 to select the appropriate value for R24 R29 Obtain the closest 1 standard value size 1206 resistors for installation Remove Rao 4 Install R24 and R29 in the appropriate positions Determine the type of VTM Customer Board to be used a Type A i Install single male to male header to X01 only ii Connect PRM and VTM Customer Boards together as illustrated in Figure 11 iii Connect the VS test point to the VTM OUT test point and VS test point to the VTM OUT test point through a twisted pair of wire b Type B i Install dual male to male headers to X01 and X03 ii Connect PRM and VTM Customer Boards together as illustrated in Figure 12 iii Verify connection from VS to VTM OUT and VS to VTM OUT 6 Connect a jumper between VTM OUT and VTM IN 7 Connect input source to
8. For use with PCB part number 35307 T VICOR Half chip PRM RS Customer Board User Guide Contents Page Introduction 1 Features 2 General 2 4 Schematic 5 Bill of Material 7 VTM Boards 8 Testing 10 Modifications 16 Conclusions 19 VICOR PowerBench The half chip PRM RS Customer Board described in this document is designed for use with the Remote Sense RS family of half chip PRMs and demonstrates the benefits of Factorized Power Architecture This demonstration board is not designed for installation in end user equipment The system demonstrates the use of a PRM Regulator and a VTM Current Multiplier for general laboratory evaluation only Please read this document before setting up a customer demonstration board The User Guide is not comprehensive and is not a substitute for common sense and good practice For example 1 When testing electronic products always use approved safety glasses 2 Provide a strain relief for wires and place the system on the bench in such a way as to prevent accidental dislodgment from the bench top 3 Remove power and use caution when connecting and disconnecting test probes and interface lines to avoid inadvertent short circuits and contact with hot surfaces 4 Never use a jumper in place of the fuse Replace the fuse only with its equivalent type and rating 5 Never attempt to disconnect the demonstration board from a VTM Customer Board while power is applied This system is not designed
9. ICOR PowerBench UG 008 vicorpower com Applications Engineering 800 927 9474 Page 18 R22 10k R32 1206 OPEN f RE u03 R31 Vref Figure 17 IN 3 GND 10k Reference Circuit 2 C14 alt R42 eia SOT 23_3 499k C12 ap GND REF3312 Regulator 1 25V 11 0 Conclusion The half chip PRM RS Customer Board is a flexible tool which allows users to implement and perform basic testing on a very wide range of configurations including PRM VTM combinations This User Guide covers some basic and advanced topics however it cannot describe every scenario If additional information is required please contact Vicor Applications Engineering Technical advice furnished by Vicor is provided as a free service with the intent to facilitate successful implementation of Vicor Products Vicor assumes no obligation or liability for the advice given or results obtained All such advice given and accepted is at user s risk Go to http Avww vicorpower com contact us for ordering information and application support 09 2014 vicorpower com Applications Engineering 800 927 9474 Rev 1 2 Page 19
10. ate location for each board When installing the push pin heat sink use caution not to exceed the maximum compressive on the device listed in the data sheet 8 0 Test Configurations The half chip PRM RS Customer Board is designed to work in a number of different configurations as described in the following section The scope of this document is limited to describing a single PRM Customer Board as a stand alone or connected to a single VTM Customer Board Other configurations may be possible though they cannot be guaranteed to have stable operation with the components designed onto the board If testing is to be performed outside of the recommended configurations the design should be evaluated to determine if changes to any of the onboard components are necessary 8 1 PRM Stand alone Operation In this configuration the PRM output voltage is sensed through the divider formed by R40 and R23 UO9B is configured as a buffer as illustrated in Figure 9 and provides the sense voltage to the error amplifier UO9A R24 and R29 are left open reserved for differential sensing R40 is set to limit the upper trim range based on a maximum reference voltage of 1 25 V ARES PRMO UT N TP10 1 e L R24 Vs 5 OPEN 7 fer i nen 6 VS R30 1 24k ta Vs TP11 UG 008 vicorpower com Applications Engineering 800 927 9474 Page 10 VICOR PowerBench 8 1 1 PRM Stand alone Operation Setup This is the nominal configuration a
11. ce Figure 7 VTM Customer Board i Type B w IM 0UT w OUT fj PC SENSE SENSE w TM an RO6 nn ROS a my Sa os a oo os q ee a Of ia l a T C in L B UTM CB PN 35079 Figure 8 VTM Customer Board Type B Connector Pinout Front View 0 IN VTM CUSTOMER BOARD VTM CUSTOMER BOF TYPE B TYPE B Signal Connector Power Signal Connectc VICOR PowerBench UG 008 vicorpower com Applications Engineering 800 927 9474 Page 9 Figure 9 Local Sense Configuration VICOR PowerBench 6 0 Recommended Test Equipment The following is a list of recommended test equipment Output load current and voltage ratings are a function of the VTM selected if used 1 DC Power Supply 0 100 V 500 W minimum a Set Overvoltage Protection OVP based on absolute maximum rating of PRM 2 Load Rated appropriately based on output voltage current and power requirements Electronic load 0 to 100 V 130 A minimum recommended DMM s Oscilloscope Probe s Interconnect cables and fastening hardware Calibrated input and output shunts appropriately rated Trim Pot screwdriver Fan IOn 00 Nr OY UL ey Data sheets for requisite PRM and VTM devices used 10 Safety glasses 7 0 Push Pin Heat Sink Installation Each PRM and VTM Customer Board comes with its own heat sink and push pins for installation Before testing it is highly recommended that heat sinks be installed in the appropri
12. est 1 standard value size 2512 resistor and replace Ros R Viv in Equation 2 08 I G LIMITSET CS Vir_iL is the IF current limit threshold 2 0 V lummmseT is the desired current limit set point Gcs is the current sense amplifier Qo2 gain 50 V V 10 3 Trim Range Adjustment The trim range is set by the reference voltage network shown below The half chip PRM RS Customer Board is nominally configured for a 20 V to 55 V trim range Any operation outside of the nominal trim range may require adjustments to the compensation Assuming local sense is implemented the output voltage is defined by Equation 3 Referring to Figure 17 the output of Uoz is 1 25 V When R22 is fully clockwise the Uo3 output voltage will be applied directly to Vrer resulting in the maximum reference voltage This in combination with the voltage sense gain will determine the maximum output voltage As R22 is turned counter clockwise R22 and Raz form a divider which limits the minimum reference voltage In order to change the upper trim range adjust the voltage sense gain R40 based on a maximum reference voltage of 1 25 V In order to change the lower trim range use Equation 3 to determine the minimum reference voltage required and adjust R42 appropriately Before making adjustments to the trim range refer to the data sheet to ensure that the device will operate outside of its rated limits 1 24kQ Ry Equation 3 V eae oy OYE eee 1 24kQ V
13. ing currents from circulating between devices 15 Voltage Sense and Error Amplifier UO9A UO9B Dual op amp provides voltage sensing and error amplifier function The customer board is nominally configured for local voltage sensing at the PRM output UO9B can be re configured as a differential amplifier to allow for non isolated remote sensing at the VTM output or load This requires rework as described in Section 8 3 16 Push Pin Heat Sink and Grounding Clip Mounting Holes Use these holes for installing the optional push pin heat sink and grounding clips included with the board Use of a heat sink is highly recommended for appropriate cooling of the PRM 3 2 Test Points In addition to the Signal Test Point Headers 6 7 there are a number of surface mount test points on the board with the following functions 1 Vin Vin TPO1 TPO3 Input voltage test points provide Kelvin connections to the input leads Use these test points for measuring the input voltage to avoid error due to interconnect losses 2 Vout Vout TPO4 TPO5 Output voltage test points provide Kelvin connections to the output leads Use these test points for measuring the output voltage to avoid error due to interconnect losses 3 Signal Ground TPO1 Signal Ground SG test point is the ground reference for all control circuitry 4 VS VS TP10 TP11 sense inputs to the differential amplifier when remote sense is implemented When used with a
14. ltage scale 200 mV division Turn on fan for cooling Apply input voltage Apply load Record oscilloscope waveform Use cursors to measure pk pk ripple Adjust scales as necessary Repeat for all desired conditions 9 3 Startup Timing Application of Input Connect input source and load Set to OFF Connect oscilloscope probes to Vin Vout and any other signals to be measured Set scope voltage and time scales appropriately i 20 msec div recommended time scale ii Trigger on positive edge of Vin Apply desired startup load 5 Set input source to ramp from O to Vin nom i Ensure that the slew rate is within acceptable limits Capture waveform Adjust scales as necessary UG 008 vicorpower com Applications Engineering 800 927 9474 Page 14 9 4 PC Enable Disable Timing 1 2 Connect input source and load Set to OFF Set PC enable switch S01 2 to the right position to disable the PRM i PC should be connected to SG 3 Connect scope probes to PC Vout and any other signals to be measured 7 8 9 Set scope scales appropriately i 1 msec div recommended ii Trigger on positive edge of PC Apply desired startup load Apply nominal input voltage Vin nom i Verify unit is disabled Move S01_2 to the left position to enable the device Record Enable waveform Adjust scales as necessary Trigger on negative edge of PC 10 Move S01_2 to the Right position to disable the device
15. nd requires no rework to implement If the board has been modified restore to its original configuration 1 2 6 7 8 9 10 11 Solder test leads to signals on the test point header that will be measured Connect input source to the input lugs Verify proper polarity Set to O Volts or OFF before connecting Connect output to load using the output lugs Set load to O Amps or OFF Insert oscilloscope probe into JO1 if used Connect DMM to the output test points Vout Vout and to any other signals to be measured Set PC Enable Switch S01_2 to the left position Apply nominal input voltage Measure output voltage and verify operation Use the output voltage trim pot R22 to adjust the output to the desired level Apply 100 load and verify full load operation Turn off load and power Proceed to following sections for detailed test procedure 8 2 PRM VTM Operation Local Sense In this configuration the PRM CB and VTM CB are connected together to form a PRM VTM pair and regulation is performed at the PRM output Load regulation will be degraded due to the VIM output resistance Tighter regulation can be achieved by implementing non isolated remote sense as described in Section 8 3 8 2 1 PRM VTM Local Sense Setup Local sensing is the nominal configuration of the customer board and requires no rework to implement If the board has been modified restore it to its original configuration 1 Ze LO 00 Oy
16. nd trim conditions Typically maximum crossover frequency will occur at full load and minimum crossover frequency will occur at minimum load Examples of closed loop response plots are illustrated below VICOR PowerBench UG 008 vicorpower com Applications Engineering 800 927 9474 Page 16 Figure 14 Sense and Compensation Components Figure 15 PRD48BH480T200A00 VO48F480T006 CB Closed Loop Response Differential Sense 48 Vour 0 2 A Resistive Load Figure 16 PRD48BH480T200A00 VO48F480T006 CB Closed Loop Response Differential Sense 48Vour 4 A Resistive Load VICOR PowerBench UG 008 R16 R40 mAN PRMOUT GND ds AR TP10 i i R24 h L ws vs 1 24k R29 Vs TPH vicorpower com Applications Engineering 800 927 9474 Page 17 10 2 Current Limit Adjustment The current limit set point is a function of the current sense amplifier gain the shunt resistor and the internal current limit threshold of the PRM The onboard current sense IC and shunt have a typical combined gain of 400 mV A The gain of the current sense IC Qoz is fixed at 50 V V and the IF current limit threshold is fixed at 2 0V The current sense shunt Ros can be changed per Equation 2 in order to adjust the current limit Once the value has been calculated obtain the clos
17. nput and output lugs for source and load connections Input fuse appropriately rated Input capacitor for source decoupling Test points for access to various device pins and circuit voltages Trim pot for adjusting the output voltage set point Voltage regulation and current sensing circuitry appropriately set for proper operation Recommended output filter inductor E A E Dual output headers female for transferring power and signal connections to downstream VTM Customer Board 9 Switch for enabling disabling the device through the PC pin 10 Oscilloscope probe jack for making accurate output voltage measurements 11 Provisions for installing custom VI Chip push pin heat sink with grounding clips optional included with board 3 0 Board Description The following section provides a detailed description of the half chip PRM RS Customer Board components and test points 5 s0t 6 T H06 H07 Figure 1 Board Description PN 35307 A 172 PRM RS C a UC VICOR PowerBench UG 008 vicorpower com Applications Engineering 800 927 9474 Page 2 Figure 2 Power Signal Connectors Pinout Front View VICOR PowerBench OUT OUT OUT 2 o Mm OUT OUT OUT X01 X03 Power Signal Connector 10 Signal Connector 9 3 1 General Components Refer to Figure 1 and Figure 2 1 10 11 Input Lugs Sized for 10 hardware Use these for making connections to the input source This board does not contain rever
18. se polarity protection Check for proper polarity before applying power Half chip PRM RS module PS01 Input Fuse F01 10 A rated Input Capacitor C01 100 uF 63 V capacitor allows for stable operation with most input sources Enable Disable Switch S01 Dual switch with the following functionality a S01_1 Top Spare switch Wired to HO7 and HO6 on the PRM signal test point header 6 to allow for extra functionality if needed Both positions are open and not connected anywhere else on the board b S01_2 Bottom PC enable switch When in the right position ON the PC pin will be connected to IN and the device will be disabled When in the left position PC will be open and the device will be enabled Signal Test Point Header Dual row of plated through hole test points for making measurements or connections to the signals labeled VTM Signal Test Point Header Plated through holes for measuring VTM signals returned through connector X03 For use only with VTM Customer Boards containing dual headers Output Lugs Sized for 10 hardware Use these lugs to connect the output directly to the load Signal Connector X03 Used to transfer the VTM PC IM TM and output sense signals between the PRM and VTM Customer Boards For use only with VTM Customer Boards containing dual headers Refer to Figure 2 for pinout Power Signal Connector X01 Used to transfer power Out and VC to downstream VTM Customer Board when u
19. sed For use with all VIM Customer Boards Refer to Figure 2 for pinout Output Oscilloscope Probe Jack J01 Used for making accurate scope measurements of the output voltage i e ripple Remove scope grounding lead and insert probe directly into jack ensuring a good connection between the jack and the probe ground barrel Do not attempt to install while power is applied May not be compatible with all scope probes UG 008 vicorpower com Applications Engineering 800 927 9474 Page 3 12 Output Voltage Trim Pot R22 11 turn trim pot adjusts the output voltage by increasing or decreasing the error amplifier reference voltage Vrer Turn clockwise to increase the output voltage and counterclockwise to decrease the output voltage Adjustment slot is 1 5 mm L x 0 6 mm W 13 High Side Current Sense Circuit Ros Qo2 Current sense shunt and IC monitor the output current and provide feedback to the IF pin for current limit protection Gain is typically 400 mV A and is set for appropriate current limit set point IF signal can be monitored at the Signal Test Point Header 6 to provide approximate output current measurement but should not be used if accurate output current measurements are required lt 10 error Efficiency measurements should always be performed using an external calibrated shunt 14 Output Inductor L01 0 4 uH inductor provides high AC impedance between PRM and VIM when used to prevent high frequency switch
20. sponse varies as a function of line load trim and output capacitance Refer to the PRM data sheet for a detailed description and AC model Adding additional capacitance to the output of the PRM or VIM Customer Board may result in instability When testing transient response it is important for the user to understand that response is a function of compensation which should be optimized based on the end requirements for best performance An example transient response waveform taken with a passive resistive load is shown below As illustrated the recovery time is on the order of 400 usec It should be noted that with control loop optimization faster transient response recovery times are possible Figure 13 Example PRD48BH480T200A00 i VIPO100THJ CB transient response veut ne PRD48BH480T200A00 VO48F480T006 CB Remote Sense Configuration tout A 5 00 Vidte A 1 944 9 80 Y offset S00kS 250MSisfEdge Posithve 10 1 1 Compensation Adjustment The sense and compensation circuit is shown below Refer to the BOM 4 3 for component values If higher bandwidth faster transient response and or operation outside of the recommended configurations are desired the user may adjust the compensation referring to the appropriate PRM data sheet for guidelines This type of tuning is highly recommended and generally requires the use of a network analyzer to measure the closed loop response Stability must be verified across all line load a
21. to demonstrate hot plug capability 1 0 Introduction The half chip PRM RS Customer Board can be used to demonstrate a stand alone regulator or in conjunction with a VTM Customer Board to enable demonstration of a Factorized Power Architecture FPA system There are many combinations possible using PRM and VTM Customer Boards but the focus in this user guide is using one PRM Customer Board and one VTM Customer Board The half chip PRM Customer Board can be configured for local sensing at the PRM output or non isolated remote sensing at the VTM output The half chip PRM Customer Board is nominally configured for local sensing where the voltage feedback circuit regulates the output voltage of the PRM Implementing remote sensing requires component changes and rework to the board which is detailed in section 8 3 1 1 Part Numbers and Ratings Refer to the specific PRM data sheet for ratings of the device It is important to remain within the device limits when testing 1 2 Contents The half chip PRM RS Customer Board arrives with the following contents 1 1 x half chip PRM RS Customer Board fully populated 1 x 11mm VI Chip push pin heat sink 2 x VI Chip push pins for heat sink installation 2 x VI Chip push pin heat sink grounding clip 2 x 10 pin male to male headers Ch eS UG 008 vicorpower com Applications Engineering 800 927 9474 Page 1 2 0 Features The half chip PRM RS Customer Board has the following features 1 I
22. vicorpower com Applications Engineering 800 927 9474 Page 13 VICOR PowerBench 9 0 Test Procedure Once the board has been setup and verified to be functional it can now be used to characterize the behavior and performance of the selected configuration Some typical tests are outlined below 9 1 Efficiency vs Line Load Ambient ily Ze NoD U gt o po Connect input source through calibrated input shunt noting the value Set to O Volts or OFF Connect output to load through calibrated output shunt noting the value Set to 0 Amps or OFF Connect DMMs to measure input voltage output voltage input shunt voltage and output shunt voltage Use Kelvin test points for input output and shunt voltage measurements Turn on fan for cooling Make sure heat sink is installed Set PC enable switch to the Left position Apply desired input voltage and load Quickly record DMM measurements to avoid heating i GPIB control recommended for simultaneous DMM measurement recording Turn off input source and load Allow device to cool to ambient temperature Repeat for all desired test conditions i GPIB control recommended for line load sweeps 10 Use data to calculate efficiency 9 2 l 2 3 onauw Pp Output Ripple vs Load Connect input source and load Set to OFF Insert oscilloscope probe into output probe jack Set oscilloscope i AC coupling 1 MQ 20 MHz bandwidth ii Time scale 1 usec div iii Vo
23. y 12 13 Solder leads to any signals on the test point header to be measured Identify the type of VTM Customer Board to be used Type A or Type B a Type A Install single male to male header to X01 only b Type B Install dual male to male headers on X01 and X03 Connect desired VTM board referring to Figure 11 or Figure 12 Connect input source to the input lugs Verify proper polarity Set to O Volts or OFF before connecting Connect VTM output to load using the output lugs Set load to 0 Amps or OFF Insert oscilloscope probe into VTM output probe jack Connect DMM to the VTM output test points and to any other signals to be measured Set PC Enable Switch S01_2 to the left position Apply nominal input voltage Measure VTM output voltage and verify operation 11 Use the output voltage trim pot R22 to adjust the output to the desired level a Do not trim below the minimum input voltage of the VTM used Apply 100 load and verify full load operation Turn off load and power Proceed to following sections for detailed test procedure UG 008 vicorpower com Applications Engineering 800 927 9474 Page 11 8 3 PRM VTM Operation Non isolated Remote Sense In this configuration the PRM and VTM Customer Boards are connected together to form a PRM VTM pair and regulation is performed at the VTM output UO9B is configured as a differential amplifier with a gain set for the appropriate output voltage R24 and R
Download Pdf Manuals
Related Search