Quick Start Procedure - Analog Devices EVAL-LT8624S-AZ-IBB User Manual

Evaluation Board User Guide

Quick Start Procedure

The EVAL-LT8624S-AZ-IBB demo board is easy to set up to evaluate the performance of LT8624S operating as an
inverting buck-boost converter. See
NOTE: When measuring the input or output voltage ripple, be careful to avoid a long ground lead on the oscilloscope
probe. For the input and output voltage ripple, measure them through the U.FL connectors—"V
respectively. Figure 5 shows the output voltage ripple measured at the output capacitor C9 through the "-V
connector.
1. Place JP1 on the FCM position.
2. With power off, connect the input power supply to V
3. With power off, connect the load's "-" input to the board's -V
board's GND (E5).
4. Connect the digital multimeter (DMM) between the input test points: "VIN SENSE" (E10) and "GND SENSE"
(E12) to monitor the input voltage. Connect another DMM between "-VOUT SENSE" (E6) and "GND SENSE"
(E8) to monitor the output voltage.
5. Set the power supply voltage to 5V and enable it.
6. Check for the proper output voltage (V
7. Once the input and output voltages are properly established, adjust the load current within the operating range
of 0A to 2A maximum. Observe the output voltage regulation, output voltage ripples, switching node waveform,
load transient response, and other parameters.
8. Add an external clock to the SYNC terminal when using the SYNC function (JP1 on the SYNC position). Choose
the R resistor (R23) to set the LT8624S switching frequency at least 20% below the lowest SYNC frequency.
T
analog.com
Figure 8 for a proper test setup and follow this test procedure.
IN
= -5V).
OUT
Figure 8. Board Test Setup
EVAL-LT8624S-AZ-IBB
(E1) and GND (E2).
(E4), and connect the load's "+" input to the
OUT
" (J2), and "-V " (J3),
IN OUT
" U.FL
OUT
Rev A 4 of 9