L6714 datasheet(63/70 Pages) STMICROELECTRONICS

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L6714

Tolerance band (TOB) definition

63/70

23.3

Time constant matching error tolerance (TOB TCMatching)

●

Inductance and capacitance Tolerance (kL, kC). Variations in the inductance value and

in the value of the capacitor used for the Time Constant Matching causes over/under

shoots after a load transient appliance. This impacts the output voltage and then the

TOB. Since all the sense elements results to be in parallel, the error related to the time

constant mismatch has to be divided by the number of phases (N).

●

Capacitance Temperature Variations (kCt). The capacitor used for time constant

matching also vary with temperature (

∆TC) impacting on the output voltage transients

ad before. Since all the sense elements results to be in parallel, the error related to the

time constant mismatch has to be divided by the number of phases (N).

●

All these parameters impact the Dynamic AVP, so they must be weighted on the

maximum dynamic voltage swing (Idyn). Total error due to time constant mismatch

results:

23.4

Temperature measurement error (VTC)

Error in the measured temperature (for thermal compensation) impacts on the output

regulated voltage since the correction form the compensation circuit is not what required to

keep the output voltage flat.

The measurement error (

εTemp) must be multiplied by the copper temp coefficient (α) and

compared with the sensing resistance (RSENSE): this percentage affects the AVP voltage as

follow:

TOB

TCMatching

AVPDyn

∆TC

⋅

()

---------------------------------------------------------

⋅

αε

Temp

⋅

SENSE

--------------------------

AVP

⋅

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