LM3753 datasheet(21/49 Pages) TI1

21 / 49 page

VDIF

SNSP

SNSM

LM3753

www.ti.com

SNVS614B – DECEMBER 2009 – REVISED MARCH 2013

REMOTE SENSE DIFFERENTIAL AMPLIFIER

The differential amplifier connected internally to the SNSP, SNSM and VDIF pins is a single stage unity gain

Instrumentation amplifier. The differential gain is tightly controlled to within 0.4%.

Figure 18. Differential Amplifier

On the master controller, the differential amplifier is used to provide Kelvin sensing of the output voltage at the

load. This provides the most accurate sampling for load regulation.

On the slave controllers, the differential amplifier is used to sense the COMP signal of the master controller with

respect to its signal ground and drive the COMP pin of that slave controller relative to its local signal ground. This

allows the master controller to accurately provide the target duty cycle of the slave controllers.

The differential amplifier has a low output impedance to allow it to drive the COMP pins of the Slave controllers.

This is necessary because the current sense signal is internally added to COMP to provide the duty cycle

adjustment for phase-to-phase current sharing.

Submit Documentation Feedback

Product Folder Links: LM3753

LM3753 Datasheet(PDF) 21 Page - Texas Instruments