Analog Devices LTC3891EUDC | Demoboard DC1940A

Description

Demonstration circuit 1940A is a low quiescent current,synchronous buck converter featuring the LTC®3891EUDC.This demo board converts a 16V to 60V voltage to a 12V at 15A output.

The main features of this board include an internal LDO for gate drive power from VIN or EXTVCC, RUN and PGOOD pins, a mode selector that allows the converter to run in constant current mode (CCM), pulse-skipping or Burst Mode® operation, and selectable current limit. The DC1940A supports an adjustable output voltage, soft-start and tracking. The wide input voltage range of 16V to 60V is suitable for double battery automotive and distributed DC power systems where low quiescent current is important.

The LTC3891 data sheet gives a complete description of this part, operation and application information. The data sheet must be read in conjunction with this quick start guide for demo circuit 1940A.

The 60V avalanche rated MOSFETs, which are used on DC1940A, can be operated at their rated voltage. However, if application derating equirements are stricter, MOSFETs with higher voltage rating can be used.

Please note, MOSFETs with higher voltage ratings may affect the efficiency. If 60V MOSFETs are used, the MOSFET avalanche rating and testing is typically done with 30% over voltage margin (78V for 60V rated MOSFET).Please check with particular MOSFET manufacturer to ensure theavalanche voltage rating.The DC1940A supports the following MOSFET packages:LFPAK, PowerPAK SO-8 and Power 56. The subsequent logic level (SV gate) MOSFETs can be used with DC1940A.

More information

• Datasheet
• IC product information