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PM6652 Datasheet(PDF) 42 Page - STMicroelectronics |
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PM6652 Datasheet(HTML) 42 Page - STMicroelectronics |
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42 / 53 page  Device description PM6652 42/53 Doc ID 16867 Rev 5 Equation 26 As explained in Section 8.7: Current sensing, the current sensing filter, if not properly designed, can impact the overall accuracy. In this case Equation 22 must be updated: Equation 27 given δV LKG the voltage drop across the current sensing filter resistor, due to the CSNS pin leakage current ( Equation 13). Equation 27 also takes account of the sensing element variation due to thermal drift: this element is almost negligible if the NTC thermal compensation network is used. 8.11.2 Current reporting (IMON) accuracy The current monitor feature (IMON), as described in Section 8.10.2: Current monitor (IMON), has the following design equation: Equation 28 ● GINT = 3 is the internal fixed gain ● RIMON and RG are external resistors for gain programming ● GSNS is the current sensing filter attenuation ● RSNS is the current sensing element. The statistical error of the IMON function can be computed: Equation 29 δR SNS/RSNS is the current sensing element accuracy; δR IMON/RIMON and δRG/RG are the external resistors accuracy; δG INT/GINT < 1% is the internal fixed gain error; VIMON,OFF < 1 mV is the IMON maximum input offset; δG SNS/GSNS is the current sensing filter error (refer to Equation 26 for details). The IMON accuracy can be influenced by a not properly designed current sensing filter (as explained in Section 8.7: Current sensing) and by the current sensing element thermal drift, as summarized in Equation 30: () 2 P P 2 S S 2 NTC NTC 2 A A SNS SNS SNS R R R R R R R R G 1 G G ⎟⎟ ⎠ ⎞ ⎜⎜ ⎝ ⎛ δ + ⎟⎟⎠ ⎞ ⎜⎜⎝ ⎛ δ + ⎟⎟⎠ ⎞ ⎜⎜⎝ ⎛ δ + ⎟⎟ ⎠ ⎞ ⎜⎜ ⎝ ⎛ δ ⋅ − = δ TH OUT LKG STAT , CORE CORE R I G V V V δ ⋅ ⋅ + δ + δ = δ OUT SNS SNS G IMON INT IMON I R G R R G V ⋅ ⋅ ⋅ ⋅ = 2 SNS SNS 2 OUT SNS SNS off , IMON 2 INT INT 2 IMON IMON 2 RG G 2 RSNS SNS IMON STAT , IMON G G I R G V G G R R R R R R V V ⎟⎟⎠ ⎞ ⎜⎜⎝ ⎛ δ + ⎟⎟⎠ ⎞ ⎜⎜⎝ ⎛ ⋅ ⋅ + ⎟⎟⎠ ⎞ ⎜⎜⎝ ⎛ δ + ⎟⎟⎠ ⎞ ⎜⎜⎝ ⎛ δ + ⎟⎟⎠ ⎞ ⎜⎜⎝ ⎛ δ + ⎟⎟⎠ ⎞ ⎜⎜⎝ ⎛ δ = δ |
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