STMicroelectronics AN1696 Application Note L6615 Load Share Controller

About this manual

The document details a system architecture using three paralleled DC-DC converter modules managed by the ST L6910. These modules are connected via an isolating element to ensure uniform current distribution and reliability.

A key feature of this design is the innovative use of a MOSFET as both an OR-ing element and a sensing element, replacing traditional diodes. The ST L6615 controller manages automatic master-slave current sharing by driving a common reference voltage based on the highest output current detected.

What's inside

• Introduction
• System Description
• Daughter Board Design
• Motherboard Design
• OR-ing FET and Current Sensing

Frequently asked questions

What is the maximum load current this system can supply in a 2+1 redundant configuration?

The system is designed to supply a 10A load at +3.3V when two sections are running.

What is the maximum voltage drop across the OR-ing FET under worst-case conditions?

The maximum voltage drop will be 75mV when considering temperature variations and worst-case resistance.