參數(shù)資料
型號(hào)： PM6652TR
廠商： STMICROELECTRONICS
元件分類： 穩(wěn)壓器
英文描述： SWITCHING CONTROLLER, 600 kHz SWITCHING FREQ-MAX, QCC32
封裝： 5 X 5 MM, 1 MM HEIGHT, 0.50 MM PITCH, ROHS COMPLIANT, VFQFPN-32
文件頁(yè)數(shù)： 37/53頁(yè)
文件大?。?/td> 2519K
代理商： PM6652TR
Device description
PM6652
42/53
Doc ID 16867 Rev 3
Equation 26
As explained in Section 8.7: Current sensing on page 31 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).
takes also 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 on page 31) and by the current sensing element
thermal drift, as summarized in Equation 30:
()
2
P
2
S
2
NTC
2
A
SNS
R
G
1
G
δ
+
δ
+
δ
+
δ
=
δ
TH
OUT
LKG
STAT
,
CORE
R
I
G
V
δ
+
δ
+
δ
=
δ
OUT
SNS
G
IMON
INT
IMON
I
R
G
R
G
V
=
2
SNS
2
OUT
SNS
off
,
IMON
2
INT
2
IMON
2
RG
G
2
RSNS
SNS
IMON
STAT
,
IMON
G
I
R
G
V
G
R
V
δ
+
+
δ
+
δ
+
δ
+
δ
=
δ
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