DC2297A-B Analog Devices

DEMO MANUAL DC2297A LT8570, LT8570-1 Boost/SEPIC/Inverting Regulator DESCRIPTION Demonstration circuits 2297A-A and 2297A-B feature the The LT8570 and LT8570-1 include many other features LT 8570 and LT8570-1 in a boost configuration. These such as synchronization to external clock, user configurable demo circuits demonstrate small size and low component undervoltage lockout, soft-start, frequency foldback, and count. Both converters are designed to convert a 5V to other features that are easily configured as Boost, SEPIC 10V source to 12V. Refer to Figures 3 and 4 for maximum or Inverting Converters. load current at different input voltage levels. The data sheet gives a complete description of the device, Both converters use only one feedback resistor to set the operation and application information. The data sheet must output voltage. be read in conjunction with this demo manual for DC2297A. The LT8570 can operate with inputs as high as 40V but Design files for this circuit board are available at in these demo circuits, the input is limited by the voltage GND VIN DEMO MANUAL DC2297A QUICK START PROCEDURE Demo circuit 2297A is easy to set up to evaluate the per- 2. Turn on the power at the input. formance of the LT8570 and LT8570-1. Refer to Figure 1 NOTE: Make sure that the input voltage does not for proper measurement equipment setup and follow the exceed 10V. procedure below: 3. Check for the proper output voltage. NOTE: When measuring the input or output voltage ripple, NOTE: If there is no output, temporarily disconnect the care must be taken to avoid a long ground lead on the load to make sure that the load is not set too high. oscilloscope probe. Measure the input or output voltage ripple by touching the probe tip directly across the VIN or 4. Once the proper output voltages are established, adjust VOUT and GND terminals. See Figure 2 for proper scope the load within the operating range and observe the probe technique. output voltage regulation, ripple voltage, efficiency and other parameters. 1. With power off, connect the input power supply to VIN and GND. I IN + POWER LOAD V V SUPPLY IN OUT + + + + + I OUT Figure 1. Proper Measurement Equipment Setup Figure 2. Measuring Input or Output Ripple dc2297afb 2