USB (5V) to Dual Output +/-15V or +/-12V Step-Up DC-DC Converter

This USB to dual output step-up DC-DC converter has been designed to be used in industrial automation control equipment, sensors, isolated operational amplifiers and test & measurement equipment that require bipolar supply voltages. The module provides +/-15V or +/-12V DC load current up-to +/-100mA. An onboard PCB solder jumper is provided to set the output voltage 15V or 12V DC. The project typically provides 75 to 82% efficiency over most of the load range. It operates with current-mode feedback at 200Khz.

The MAX743 DC-DC converter IC contains all the active circuitry needed to build small, dual-output power supplies. Relying on simple two-terminal inductors rather than a transformer, the MAX743 regulates both outputs independently to within +/-4% overall conditions of line voltage, temperature, and load current.

Features

• DC Input USB Power Or 5V DC
• Output Dual 15V Or 12V DC Load Up-to +/-100mA
• Easy to Use USB Connector
• J1 PCB Jumper To Set 15V or 12V Output
• Header Connector for Output
• Efficiency 75 to 82%
• Operation Frequency 200 kHz
• On-Board Power LED
• PCB Dimensions 56.37 x 19.19mm

Schematic

Parts List

L1, L2 Inductor Selection

• DIGIKEY PART:  CDRH73NP-101MC-B-ND OR  SRR0805-101KCT-ND
• Any inductor with dimensions 8MM X 8MM TO 12MM X 12MM can be used.
• Inductor Value: 100uH, current capability 300mA to 1A.
• Recommended COILCRAFT PART: DO3316P-104

Connections

Photos

Video

MAX743 Datasheet

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