Demonstration Circuit 736 is a 200kHz high voltage, current- mode DC/DC step-down converter featuring the LT3724. The circuit operates from a Vin range of 30V ñ 55V and outputs 24Vout @ 3A (72W). A soft-start feature controls the output voltage slew rate at start-up, reducing current surges and voltage overshoots. The Burst Mode of operation that improves the efficiency at light loads can be enabled with a jumper. An Optional Boost Bias circuit is provided on the bottom side of the board for back-driving the LT3724 internal regulator from the output voltage. Customers might want to use this optional circuit with modified applications that have relatively high input voltages and low (~ 5V) output voltages. In such applications, the optional circuit can increase the overall efficiency by reducing the power lost in the LT3724. The demonstration circuit has also been layed out with the option for a second switching MOSFET to facilitate higher output currents. The circuit design can be modified for a Boost converter configuration. This circuit is suitable for a wide range of Industrial control systems and particularly suitable for 12V/42V Automotive applications and 48V Telecom power supplies.