DC765B Analog Devices

DEMO MANUAL DC765B LT3479 General Purpose Positive/ Negative Converters Description Demonstration circuit 765B is a general purpose 1MHz, outputs on this demo circuit can be modified for higher positive and negative converters featuring the LT3479EDE. voltages. These circuits are intended for space-conscious The demo circuit demonstrates small size and low compo- applications such as high power LED drivers, DSL modems nent count in a boost circuit and an inverting circuit. The and distributed power. boost converter is set up to convert a 2.5V to 4.2V input Design files for this circuit board are available at to 7V output at 600mA. The inverting circuit generates a DEMO MANUAL DC765B Quick s tart p D Demonstration circuit 765B is easy to set up to evaluate 4. Once the proper output voltages are established, the performance of the LT3479EDE. Refer to Figure 1 for adjust the input voltage within the operating range proper measurement equipment setup and follow the and observe the output voltage regulation, ripple procedure below: voltage, efficiency and other parameters. When measuring the input or output voltage ripple, For inverter circuit: care must be taken to avoid a long ground lead on the 1. Place jumper in the ON position. oscilloscope probe. Measure the input or output voltage 2. With power off, connect the input power supply to ripple by touching the probe tip directly across the V IN V and GND. or V and GND terminals. See Figure 1 for proper IN OUT scope probe technique. 3. Turn input supply on and apply 2.5V to 12V to the input. For boost converter circuit: 4. Once the proper output voltages are established, 1. Place jumper in the ON position. adjust the input and load within the operating range 2. With power off, connect the input power supply to and observe the output voltage regulation, ripple V and GND. IN voltage, efficiency and other parameters. 3. Turn input supply on and apply 2.5V to 4.2V to the input. Figure 1. DC765B Proper Equipment Setup dc765bf 2 ure roce