參數(shù)資料
型號(hào)： LM25066PSQX
廠商： NATIONAL SEMICONDUCTOR CORP
元件分類： 電源管理
英文描述： POWER SUPPLY SUPPORT CKT, QCC24
封裝： LLP-24
文件頁(yè)數(shù)： 36/48頁(yè)
文件大?。?/td> 1456K
代理商： LM25066PSQX
Reading Input and Output Voltage
Coefficients for VIN and VOUT are fixed and are consistent
between read telemetry measurements (e.g., READ_VIN,
READ_AVG_VIN)
and
warning
thresholds
(e.g.
VIN_UV_WARN_LIMIT). Input and output voltage values are
read/written in Direct Format with 12-bit resolution and a 4.54
mV LSB. An example of calculating the PMBus coefficients
for input voltage is shown below.
Step
Example
1. Determine m' based on full scale analog input and full scale
digital range:
2. Determine exponent R necessary to set m' to integer value m
with desired accuracy:
Select R to provide 5 digit accuracy for the integer value of m
(which would be 21703 in this example:
R = -2
3. Final values
m = 22026
R = -2
b =0
Reading Power
The power calculation of the LM25066 is a relative power cal-
culation meaning that full scale of the power register corre-
sponds to simultaneous full scale values in the current
register and voltage register such that the power register has
the following relationship based on decimal equivalents of the
register contents:
For this reason power coefficients will also vary depending on
the shunt value and must be calculated for each application.
The power LSB will vary depending on shunt value according
to 276 W/Rsense for 46mV range or 138.2 W/Rsense for
25mV range.
Step
Example
1. Determine full scale power from known full scale of input
current and input voltage
P
IN_MAX = VIN_MAX x IIN_MAX
Example: 125A application with 250
shunt.
P
IN_MAX = (18.59V) x (120.8A) = 2246W
2. Determine m':
3. Optional: Determine exponent R necessary to set m' to integer
value m with desired accuracy:
Select R (in this case selected to provide 4 digit accuracy for the
integer value of m):
R = -3
4. Final values
m = 1823
R = -3
b = 0
41
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LM25066
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