Quick Start Guide for Demo Board DC377B-A The DC377B-A demo board features the LTC3716 IC, an IMVP2 compatible 2-phase power supply for Intel P3-M processor (Tualatin). The input is 8 to 21V. The output is programmed by the IMVP2 5-bit VIDs (jumpers on the board). The maximum output current is 25A. Jumper Assignments The jumpers on the demo board are listed below with their corresponding settings. The quick start procedure below also provides specific jumper settings--be sure to follow the instructions carefully. Jumper Position Function On Off VID0 VID0=0 VID0=1 VID1 VID1=0 VID1=1 VID2 VID2=0 VID2=1 VID3 VID3=0 VID3=1 VID4 VID4=0 VID4=1 VRON high low DSPLP# high low DPRSLPVR high low GMUXSEL high low DLC ON Dynamic Load Test Circuit shut off Dynamic Load Test Circuit turned on Function Jumper Position Leftmost Rightmost Left Off VBIAS Onboard 3.3V bias is used External 3.3V bias is used Do not leave off! FCB FCB=0 FCB=2V FCB=5V DC377B-A Quick Start Guide Page 1 of 3 Quick Start Procedure Refer to Figure 1 for proper measurement equipment setup and follow the procedure below: 1. Set the jumpers on the board as follows: VRON OFF DPSLP# ON DPRSLPVR GMUXSEL OFF ON VID0 OFF VID1 OFF VID2 OFF VID3 ON VID4 ON DLC ON ON VBIAS E FCB L 2. Apply input voltage 7~24V across the VIN+ and VIN- terminals. 3. Apply +3.3V logic voltage across +3.3V and SGND terminals. 4. Apply 5V across EXTVCC and SGND terminals if needed. 5. Select VID code using the jumpers VID0-VID4. 6. Select the GMUXSEL/DPRSLPVR/DPSLP# combination using the appropriate jumpers. 7. Replace the VRON jumper 8. Apply the test load across VCC+ and VCC-. Do not exceed a 25A load. Transient Test This demo board has a built-in dynamic load test circuit. To test load transients, review Figure 1 and follow this procedure: 1. Shut down the converter by removing the VRON jumper. 2. Apply 12V supply to the +12V, PGND and -12V terminals. 3. To monitor load current waveforms, connect an oscilloscope to J5 (BNC terminal). 4. Replace the VRON jumper. 5. Remove the DLC ON (Dynamic Load Circuit) jumper. 6. Tune R41, R43 and R39 to program the step amplitude, up-slope and down-slope of the load step, respectively. DC377B-A Quick Start Guide Page 2 of 3 R39 R41 R43 DYNAMIC LOAD TEST CIRCUIT BACK OF DEMO BOARD 'SCOPE FOR MONITERING LOAD TRANSIENT TEST FRONT OF DEMO BOARD DPSLP# VRON DPRSLPVR GMUXSL J5 VIN- VCC- - VIN+ VID4 + VID3 + VID2 - - 2 PHASE MOBILE CPU VRM + VID1 VID0 - DLC ON LOAD + - + - + VCC+ LTC3716 FCB VBIAS I E L +3.3V SGND + H (408) 432-1900 EXTVCC PGOOD - DC377B-A or B PGND +12V - + + Figure 1. DC377B-A Quick Start Guide -12V - Proper Measurement Equipment Setup Page 3 of 3