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LM5116 additional control circuit as proposed in SLUR965

Denis Kotlar
Intellectual 790 points
Other Parts Discussed in Thread: LMC7101, LMV431, LM5116, PMP7282, LMC555

I'd like to know what is a purpose or benefit of adding control circuit (for controlling LM5116 as shown in document SLUR965? Does external reference LMV431 and precision opamp LMC7101 are used as some sort of additional reference in parallel with standard resistor network connected to the feedback pin 8?

 

  • 0
    TI__Guru**** 191445 points
    PMP7282 is a 2-phase buck converter capable of 600W output power. This design uses two LM5116 emulated current-mode synchronous buck controllers in a master /slave configuration. An LMC555 timer provides synchronization with 180 degrees between the two phases to mini-mize input and output ripple current. Current sharing is accomplished using an LMC7101 op
    amp, which forces the control voltage of the slave to follow that of the master. An LMV431 is used to control a pass regulator for the 5V op amp and timer supply. The LMV431 also provides the reference voltage for the op amp, which matches the internal reference of the LM5116 for proper tracking. See the full reference material here:

    http://www.ti.com/lit/ug/sluua30/sluua30.pdf
  • 0 in reply to JohnTucker
    Intellectual 790 points
    Many thanks John for quick answer.