DC1073 - LT3845 Evaluation Kit

Features

LT3845 Evaluation Kit

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Typical Application

DC1073
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Description

Demonstration Circuit 1073 is a100kHz-500kHz programmable frequency,high voltage, current-mode DC/DC step-down converter featuring theLT3845. The operating frequency can be synchronized up to 600kHz. The demo board is designed for 12V @6.25A (75W) output from a 20V to 55Vinput. A soft-start feature controls the output voltage slew rate at start-up, reducing current surges and voltage overshoots. The modes of operation(Burst Mode, Discontinuous Current Mode and Continuous Current Mode) are jumper selectable. Both  Burst Mode and Discontinuous Current Mode increase the efficiency at light loads. Continuous Current Mode will maintain a constant switching frequency regardless of the load current.An Optional Boost Bias circuit is provided on the bottom side of the board for back-driving the LT3845 in the rnalregulator from the output voltage. Customers may want to use this optional circuit with modified applications that have relatively high input voltages and low (~ 3.3V)output voltages. In such applications,the optional circuit can increase the overall efficiency by reducing the power loss in the LT3845.The demonstration board has also been laid out with the option of doubling the switching MOSFETs to facilitate higher output current. This board issuitable for a wide range of industrial control systems and particularly suitable for 12V/42V automotive applications and 48V  Telecom  power supplies.The LT3845 datasheet gives a complete description of the part, operation and application information. The datasheet must be read in conjunction with this quick start guide for democircuit 1073.Note: It is best to ground the SYNC pin if the SYNC function is not being used.
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Packaging

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Order Info

Evaluation Kits

Part Number Description Price
DC1073A LT3845EFE Demo Board | 20V ≤ Vin ≤ 55V, Vout: 12V/6.25A $150.00
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Applications

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Simulate

To simulate selected Linear Technology products, please download LTSpice / SwitcherCAD III. This powerful schematic capture and simulation tool includes macro models for 80% of Linear Technology's switching regulators, over 200 op amp models, as well as resistors, transistors and MOSFET models.

For other simulation tools, visit our Design Simulation and Device Models page.

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