Analog Devices LT8613 | Demoboard DC2011A

Description

Demonstration Circuit 2011A is a 42V, 6A micropower synchronous step-down regulator with current sense featuring the LT®8613. The demo board is designed for 5V output from a 5.8V to 42V input. The wide input rangeallows a variety of input sources, such as automotive batteries and industrial supplies. The LT8613 is a compact, high efficiency, and high speed synchronous monolithic step-down switching regulator. The integrated power switches and inclusion of all necessary circuitry reduce the components count and solution size. Ultralow 3μA quiescent current in Burst Mode® operation achieves high efficiency at very light loads. Fast minimum on-time of 40ns enables high VIN to low VOUT conversion at highfrequency.The LT8613 switching frequency can be programmed either via oscillator resistor or external clock over a 200kHz to 2.2MHz range. The SYNC pin on the demo board is grounded by default for low ripple Burst Mode operation.To synchronize to an external clock, move JP1 to SYNC and apply the external clock to the SYNC turret. Once JP1 is on SYNC position, a DC voltage of 3V or higher can be applied to the SYNC turret for pulse skipping operation.The DC2011A has output current limit set at 6A by default.The current limit can be moved to the input side for application where input supply current is limited. ICTRL and IMON on the board set and monitor the regulated current, respectively.Figure 1 shows the efficiency of DC2011A circuit. Figure 2 shows the LT8613 temperature rising on DC2011A demo board under different load conditions. The rated maximum load current is 6A, while derating is necessary for certain VIN and thermal conditions. The demo board has an EMI filter installed. To use the EMI filter, the input should be tied to VEMI terminal, not VIN terminal.The LT8613 data sheet gives a complete description of the part, operation and application information. The data sheet must be read in conjunction with this demo manual for DC2011A. The LT8613 is assembled in a 3mm × 6mm plastic QFN package with exposed pads for low thermal resistance. Proper board layout is essential for minimum EMI and maximum thermal performance. See the data sheet section “PCB Layout” and “High Temperature Considerations”.

Features

Note:-L2=6.8uH INDUCTOR andFB1=FERRITE BEAD 100Ω 8A SMD 1812 are used

Typical applications

• CCCV Power Supplies
• Automotive and Industrial Supplies
• General PurposeStep-Down

More information

• Datasheet
• IC product information