DC1559A Analog Devices

DEMO MANUAL DC1559A LTM8046 3.1V to 32V , 2kV Isolated IN IN DC/DC Module Converter DESCRIPTION The demo circuit 1559A features the LTM8046, a 2kVAC, The LTM8046 data sheet gives complete description of 2.5W isolated flyback Module converter. The demo the device, operation and application information. The data circuit is designed for a 5V output from a 3.2V to 26V sheet must be read in conjunction with this demo manual input. The typical current capability of the 5V output varies prior to working on or modifying demo circuit 1559A. with input voltage from about 150mA at V = 4V to about IN Design files for this circuit board are available at 550mA at V = 26V. R2 provides the necessary minimum IN DEMO MANUAL DC1559 A QUICK START PROCEDURE Demo circuit 1559A is an easy way to evaluate the per- Note: Make sure that the input voltage does not exceed 26V. formance of the LTM8046. Refer to Figure 3 for proper 3. Check for the proper output voltage between VOUT and measurement equipment setup and follow the procedure VOUT-. below: Note: If there is no output, temporarily disconnect the load Note: When measuring the input or output voltage ripple, to make sure that the load is not set too high. care must be taken to avoid a long ground lead on the 4. Once the proper output voltage is established, adjust oscilloscope probe. Measure the input or output voltage the load within the operating range and observe the output ripple by touching the probe tip directly across the VIN or voltage regulation, ripple voltage, efficiency and other VOUT and GND terminals. See Figure 4 for proper scope parameters. probe technique. 1. With power off, connect the input power supply to VIN and GND. 2. Turn on the power at the input. 700 0 600 20 500 40 400 60 300 80 200 100 100 0 120 4 10 18 24 26 6 8 12 14 16 20 22 0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 V (V) FREQUENCY (MHz) IN Figure 1. V Maximum Output Current vs V Figure 2. V Output Noise Spectrum with I at 300mA OUT IN OUT OUT and V at 12V IN dc1559af 2 OUTPUT CURRENT (mA) INTENSITY (dBm)