DEMO MANUAL DC2312A-A/DC2312A-B LTC3882EUJ-1 High Efficiency Step-Down DC/DC Converter with Power System Management DESCRIPTION Demonstration circuit 2312A is a high current, high DC/DC converter. To fully explore the extensive power efficiency, dual phase synchronous buck converter system management features of the part, download the featuring the LTC3882EUJ-1, a dual output voltage GUI software LTpowerPlay onto your PC and use LTCs 2 mode controller with the additional features of dif- I C/SMBus/PMBus Dongle DC1613A to connect to the ferential V sense and dedicated PGOOD output on board. LTpowerPlay allows the user to reconfigure the OUT both channels, compared to LTC3882. The LTC3882-1 part on-the-fly and store the configuration settings within has the PMBus interface and power system manage- its onboard EEPROM, along with viewing telemetry pa- ment functions. rameters that include voltage, current, temperature and fault status. There are two versions of the boards available: n DC2312A-A: Dual phase dual output configuration. De- GUI Software LTpowerPlay Download fault output setting V = 1.5V/35A, V = 1.0V/35A. OUT0 OUT1 The software can be downloaded from: n DC2312A-B: Dual phase single output configuration. DEMO MANUAL DC2312A-A/DC2312A-B QUICK START PROCEDURE Demonstration circuit 2312A makes it easy to set up to 2. With power off, connect the input power supply to V IN evaluate the performance of the LTC3882-1. Refer to and GND. Connect active load to the output. Figures 2 and 3 for proper measurement equipment setup 3. Make sure both RUN switches are OFF. and follow the procedure below. 4. Turn on the power at the input. NOTE. When measuring the input or output voltage ripple, Note. Make sure that the input voltage does not ex- care must be taken to avoid a long ground lead on the ceed15V. oscilloscope probe. Measure the output voltage ripple by touching the probe tip directly across the C13 or C39. See 5. Turn on RUN switches as desired. Figure 4 for proper scope probe technique. + 6. Check for the correct output voltage from V to OUT0 1. Make sure jumpers are in the following positions: + V and from V to V . OUT0 OUT1 OUT1 DC2312A-A Version Note. If there is no output, temporarily disconnect the JUMPER POSITION FUNCTION load to make sure that the load is not set too high. JP1 NC Untie GPIO0B to GPIO1B 7. Once the proper output voltage is established, adjust JP2 NC Untie RUN0 to RUN1 the loads within the operating range and observe the JP4 ON External 5V VDR for DrMOS output voltage regulation, ripple voltage, efficiency and JP6 ON External 5V V for LTC3882-1 CC other parameters. DC2312A-B Version 8. Connect the dongle and control the output voltages JUMPER POSITION FUNCTION from the GUI. See LTpowerPlay Quick Start Procedure JP1 C Tie GPIO0B to GPIO1B session for details. JP2 C Tie RUN0 to RUN1 JP4 ON External 5V VDR for DrMOS JP6 ON External 5V V for LTC3882-1 CC CONNECTING A PC TO DC2312A You can use a PC to reconfigure the power management other functionality. The DC1613A dongle may be plugged features of the LTC3882-1 such as: nominal V , margin in regardless of whether or not V is present. Dongle can OUT IN set points, OV/UV limits, temperature fault limits, sequenc- be hot plugged. ing parameters, the fault log, fault responses, GPIO and +12V POWER SUPPLY USB CABLE V IN V OUT0 12-PIN LOAD LTC3882-1 2 USB TO I C/PMBUS DEMO BOARD V OUT1 DONGLE DC1613A CONNECTOR DC2312A LOAD DC2312A F01 Figure1. Demo Setup with PC dc2312afb 2