LM5050-1: Block Diagram explanation

Prodigy 140 points
Shiv Aishwarya Singh

Part Number: LM5050-1

Please help me understand below portion of circuit:

Regards,

Shiv

Prodigy 140 points
Shiv Aishwarya Singh
  • Genius 12090 points
    Alex Triano
    Hi Shiv,

    My apologies for this question slipping through the cracks amongst our team. We strive for a 24 hour response time and we hope that this isolated case does not prevent you from using E2E again.

    I understand the block diagram for the LM5050 can be confusing at first.

    What you are looking at is a differential amplifier with 35uA current biasing. Since the base of one BJT is connected to the IN pin minus 30mV and the other is connected to the OUT pin, this means it is setting the GATE to pull down if the voltage difference between these pins is less than 30mV.

    Note that the block diagram is a little off, that 30mV corresponds to the spec for the forward regulation threshold which is 22mV (typical) with a 12V input. Similarly, the 30mV shown near the reverse comparator block is also off - it should be 28mV (typical).

    However the basic functionality of the LM5050 may be simplified to the following three statements:

    If IN – OUT > 22mV, increase GATE voltage
    If IN – OUT < 22mV, decrease GATE voltage
    If IN – OUT < -28mV, pull GATE to IN with strong pull down.

    Thanks,
    Alex

    _____________________________________________

    If this answers your question, please select Verify Answer

    To find the latest information on hot swap, visit www.ti.com/hotswap

All content and materials on this site are provided "as is". TI and its respective suppliers and providers of content make no representations about the suitability of these materials for any purpose and disclaim all warranties and conditions with regard to these materials, including but not limited to all implied warranties and conditions of merchantability, fitness for a particular purpose, title and non-infringement of any third party intellectual property right. TI and its respective suppliers and providers of content make no representations about the suitability of these materials for any purpose and disclaim all warranties and conditions with respect to these materials. No license, either express or implied, by estoppel or otherwise, is granted by TI. Use of the information on this site may require a license from a third party, or a license from TI.

Content on this site may contain or be subject to specific guidelines or limitations on use. All postings and use of the content on this site are subject to the Terms of Use of the site; third parties using this content agree to abide by any limitations or guidelines and to comply with the Terms of Use of this site. TI, its suppliers and providers of content reserve the right to make corrections, deletions, modifications, enhancements, improvements and other changes to the content and materials, its products, programs and services at any time or to move or discontinue any content, products, programs, or services without notice.

TI Worldwide | Contact Us | my.TI Login | Site Map | Corporate Citizenship | mobile m.ti.com (Mobile Version)

TI is a global semiconductor design and manufacturing company. Innovate with 100,000+ analog ICs and
embedded processors, along with software, tools and the industry’s largest sales/support staff.

© Copyright 1995-2017 Texas Instruments Incorporated. All rights reserved.
Trademarks | Privacy Policy | Terms of Use