DC1854A Analog Devices

DEMO MANUAL DC1854A LT8471EFE Dual Output, Buck and Inverting Converter Description DC1854A is a dual output buck and inverting converter. The LT8471 has an adjustable oscillator, set by a resistor It provides 5V and 5V power from 6V to 32V input. The placed from the RT pin to ground. Additionally, the LT8471 5V output can source up to 1.4A load current and the can be synchronized to an external clock. The free running 5V output can source up to 800mA load current. See or synchronized switching frequency range of the part the load current versus input voltage figures inside this can be set between 100kHz and 2MHz. DC1854A is set at demo manual for more information. The internal skyhook 450kHz. Additional features such as frequency foldback, supply is used to provide voltage to the internal npn switch soft-start, and power good are integrated. and can be used for various topologies. Although they are The LT8471 data sheet gives a complete description of assembled as a single inductor buck and a single inductor the part, operation and applications information. The data inverting converter on DC1854A, the two DC/DC converters sheet must be read in conjunction with this Demo Manual can be altered for different topologies. for DC1854A. The LT8471EFE is assembled in a 20-lead The LT 8471 is a dual PWM DC/DC converter containing plastic TSSOP (FE) package with a thermally enhanced two internal 2A, 50V switches and an additional 500mA ground pad. Proper board layout is essential for maximum switch to facilitate step-down and inverting conversion. thermal performance. See the data sheet section Layout Each 2A channel can be independently configured as a Considerations. buck, boost, SEPIC, flyback or inverting converter. Ca- Design files for this circuit board are available at pable of generating positive and negative outputs from a DEMO MANUAL DC1854A Quick s Dp DC1854A is easy to set up to evaluate the performance of 3. Connect resistive or electronic loads within the maximum the LT8471EFE Follow the procedure below: parameters to outputs VOUT1 and VOUT2. 1. Connect the OV/UV terminal to GND to disable switching 4. Release the OV/UV-to-GND connection. during power supply startup. 5. Observe the VOUT1 and VOUT2 voltages as well as the 2. With power off, connect the input power supply to the PG1 and PG2 voltages. Observe the circuit efficiency VIN and GND terminals. Make sure that the VIN DC or other operation while the input voltage is between input voltage will not exceed 32V. 6V and 32V. Figure 1. Test Procedure Setup Drawing for DC1854A dc1854af 2 ure roce tart