ADP1048 Analog Devices, ADP1048 Datasheet - Page 24

• Manufacturer Part Number: ADP1048
• Description: Digital Power Factor Correction Controller with accurate AC Power Metering
• Manufacturer: Analog Devices

ADP1047/ADP1048
ADVANCED INPUT POWER METERING
The
information, including input and output voltage, input and
output current, temperature, and efficiency. They also monitor
and communicate OVP, UVP, OCP, OTP, and open-loop protec-
tion functions. An I
and programs their thresholds. The on-chip EEPROM can be
used to store all of the settings for the thresholds.
True rms values are calculated at the end of each half ac line
cycle by integrating the instantaneous values across each line
cycle. These values have a resolution of 11 bits and are used to
calculate the average, but are not available to be read through
the PMBus interface.
The averaging window is programmable from zero full line
cycles to 4096 full line cycles using Register 0xFE3A. At the
end of each averaging period, the new value for average power
is written to the READ_PIN register (Register 0x97) and is
Table 10. Data Format and Range for V
Metering Data
V
I
P
V
IN
IN
IN
OUT
ADP1047/ADP1048
Mantissa (Bits)
11
11
11
11
2
C interface reads all these values and flags
monitor and communicate critical
Exponent (N)
−3 to −1
−10 to −5
−4 to +3
−3 to 0
PGND
VAC
IN
CS+
CS–
, I
IN
, P
IN
Figure 24. Block Diagram of Power Monitoring
, and V
ADC
ADC
OUT
Minimum Range
256 V
2 A
256 W
256 V
Rev. 0 | Page 24 of 84
1
SYNC
RMS
RMS
RMS
AC
available to be read back through the interface until it is
overwritten by the next averaged value at the end of the next
averaging period.
For this reason, the polling frequency used to read average
power through the PMBus interface must be equal to or higher
than the averaging window to maintain data integrity. The
averaging window is programmable over a wide range of times
to accommodate different situations.
Input voltage, input current, output voltage, and input power
are reported in linear format in the following registers:
•
•
•
•
0 LINE CYCLES
2
LINE CYCLES
Input voltage: READ_VIN (Register 0x88)
Input current: READ_IIN (Register 0x89)
Output voltage: READ_VOUT (Register 0x8B)
Input power: READ_PIN (Register 0x97)
TO 4096
AVG
AVG
AVG
Minimum LSB
0.125 V
0.976 mA
125 mW
0.125 V
3
V
P
I
IN
IN
IN
Maximum Range
1024 V
64 A
32.8 kW
2048 V
Data Sheet
Maximum LSB
0.5 V
0.03125 A
16 W
1 V