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VICOR VI Chip PRM-RS, User Manual, Page: 14 / 19

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VICOR VI Chip PRM-RS User Manual Download Page 14

User Guide UG:008

vicorpower.com

800-735-6200

Rev. 1.1

11/10

Page 14 of 19

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)

1. Connect input source through calibrated input shunt noting the value. Set to 0 Volts or OFF.

2. Connect output to load through calibrated output shunt noting the value. 

Set to 0 Amps or OFF.

3. 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.

4. Turn on fan for cooling. Make sure heat sink is installed.

5. Set PC enable switch to the Left position.

6. Apply desired input voltage and load.

7. Quickly record DMM measurements to avoid heating.

i.

GPIB control recommended for simultaneous DMM measurement recording.

8. Turn off input source and load. Allow device to cool to ambient temperature.

9. Repeat for all desired test conditions.

i.

GPIB control recommended for line/load sweeps. 

10. Use data to calculate efficiency.

9.2

Output Ripple vs. Load

1. Connect input source and load. Set to OFF.

2. Insert oscilloscope probe into output probe jack.

3. Set oscilloscope:

i.

AC coupling 1 M

Ω

, 20 MHz bandwidth.

ii.

Time scale: 1 

µ

sec / div

iii. Voltage scale: 200 mV / division

4. Turn on fan for cooling.

5. Apply input voltage.

6. Apply load.

7. Record oscilloscope waveform. Use cursors to measure pk-pk ripple. Adjust scales as necessary.

8. Repeat for all desired conditions.

9.3

Startup Timing, Application of Input

1. Connect input source and load. Set to OFF.

2. Connect oscilloscope probes to V

IN

, V

OUT

, and any other signals to be measured

3. Set scope voltage, and time scales appropriately.

i.

20 msec / div recommended time scale

ii.

Trigger on positive edge of V

IN

4. Apply desired startup load

5. Set input source to ramp from 0 to V

IN(NOM)

.

i.

Ensure that the slew rate is within acceptable limits

6. Capture waveform. Adjust scales as necessary.

Summary of Contents for VI Chip PRM-RS

Page 1: ...emonstrate 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 Cus...

Page 2: ...urrent sensing circuitry appropriately set for proper operation 7 Recommended output filter inductor 8 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 V I Chip push pin ...

Page 3: ...surements or connections to the signals labeled 7 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 8 Output Lugs Sized for 10 hardware Use these lugs to connect the output directly to the load 9 Signal Connector X03 Used to transfer the VTM PC IM TM and output sense signals betwe...

Page 4: ...tage sensing at the PRM output U09B 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 recomme...

Page 5: ...TP14 TP15 TP16 TP17 TP06 H 01 H02 H03 H04 H05 H07 H06 H08 H 09 H10 H11 H12 H13 PC 2 IN 8 9 OUT OUT 10 VC 11 VS 15 IN 7 PR 1 TM 3 NC 4 NC 5 NC 6 RE 12 SG 13 IM 14 PO 16 PS01 R02 TP19 TP13 TP18 TP04 TP08 TP05 TP09 SOT 23_5 X01 32770 Vout Vout Vout TP07 TP03 TP02 C05 100u Vvtm_out 32770 X03 TM VTM PC VTM IM VTM PRM RS GND 1 24k VS 1 24k Vs Vs PR Vref RE Vref C14 REF3312 Regulator 1 25V SOT 23_3 GND 3...

Page 6: ...User Guide UG 008 vicorpower com 800 735 6200 Rev 1 1 11 10 Page 6 of 19 Figure 4 Half chip PRM RS Customer Board Assembly Drawing 4 2 Assembly Drawing ...

Page 7: ...ic R09 RES 0 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 Not Applied Not Applied Not Applied R25 Not Applied Not Applied Not Applied R27 RES 0 OHM 1 8W 5 1206 Generic Generic R28 RES 1K OHM 1 4W 1 1206 Generic G...

Page 8: ...s 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 ar...

Page 9: ...onal 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 Figure 7 VTM Customer Board Type B NC NC VS VS IM VTM PC VTM TM VTM IN IN IN IN IN IN IN IN VC VC VTM TYPE B Power Signal Connector VTM TYPE B Signal Connector VTM I...

Page 10: ...on 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 ...

Page 11: ...ue to the VTM 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 Solder leads to any signals on the test point header to ...

Page 12: ...or installation 3 Remove R40 4 Install R24 and R29 in the appropriate positions 5 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...

Page 13: ...ge 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 ...

Page 14: ...us DMM measurement recording 8 Turn off input source and load Allow device to cool to ambient temperature 9 Repeat for all desired test conditions i GPIB control recommended for line load sweeps 10 Use data to calculate efficiency 9 2 Output Ripple vs Load 1 Connect input source and load Set to OFF 2 Insert oscilloscope probe into output probe jack 3 Set oscilloscope i AC coupling 1 MΩ 20 MHz band...

Page 15: ... 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 1 ...

Page 16: ...sive resistive load is shown below As illustrated the recovery time is on the order of 400 µsec It should be noted that with control loop optimization faster transient response recovery times are possible 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 o...

Page 17: ... C08 C07 R16 R25 R28 C10 R30 R23 GND GND PRMOUT R40 R24 R29 TP10 Hz Gain Phase Figure 14 Sense and Compensation Components Figure 15 PRD48BH480T200A00 V048F480T006 CB Closed Loop Response Differential Sense 48 VOUT 0 2 A Resistive Load Hz Gain Phase Figure 16 PRD48BH480T200A00 V048F480T006 CB Closed Loop Response Differential Sense 48VOUT 4 A Resistive Load ...

Page 18: ... 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 U03 is 1 25 V When R22 is fully clockwise the U03 output voltage will be applied directly to VREF resulting in the maximum reference voltage This in combination with the voltage sense gain will determine the maximum output voltage As R22 ...

Page 19: ...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 US Technical Support Center Tel 800 927 9474 or email at apps vicr com France Support Center Tel 33 ...

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