PM6652 datasheet(41/53 Pages) STMICROELECTRONICS

41 / 53 page

PM6652

Device description

Doc ID 16867 Rev 5

41/53

8.11

System accuracy

8.11.1

VCORE accuracy

Starting from

Equation 7 and Equation 9, the programmed output voltage is given by:

Equation 23

●

VDAC is the internal reference voltage, i.e. the digital-to-analog converter output

programmed by the 7 VIDs

●

GD is the droop gain, given by Equation 8

●

GSNS is the current sensing filter attenuation. This element is lower than 1 if there is an

NTC thermal compensation network, typically used in DCR current sensing technique

●

RSNS is the current sensing element, i.e. the inductor DCR or the precision resistor.

The statistical variation of the output voltage is given by the following equation:

Equation 24

●

δV

DAC is the internal reference voltage error, lower than 0.7% of the programmed VID

(refer to

Figure 5)

●

δG

D/GD and δGSNS/GSNS are the statistical error of the droop gain and NTC network, if

used. These two elements are only influenced by external components

●

δR

SNS is the current sensing element (inductor's DCR or precision resistor) variation

due to its accuracy

●

δV

OFFSET < 2.5 mV is the PM6652 integrator maximum offset.

Based on

Equation 7, the droop gain statistical error is:

Equation 25

The same mathematical approach provides the following computation, based on

Equation 11:

()

OUT

SNS

DAC

SNS

⋅

−

() (

)

() (

)

SNS

OFFSET

SNS

OUT

SNS

OUT

SNS

DAC

STAT

CORE

⋅

⎟

⎠

⎞

⎜

⎝

⎛

⎟⎟⎠

⎞

⎜⎜⎝

⎛ δ

⎟⎟

⎠

⎞

⎜⎜

⎝

⎛ δ

⋅

⎟⎟⎠

⎞

⎜⎜⎝

⎛ δ

⎟⎟⎠

⎞

⎜⎜⎝

⎛ δ

−

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