PM4100APD South African Micro-Electronic Systems, PM4100APD Datasheet - Page 2

• Manufacturer Part Number: PM4100APD
• Description: PM4100APD Evaluation Module is Designed to Demonstrate The Functionality of The Sames SA2002E, SA2002H, SA2002P, SA2002D And SA2102D Integrated Circuits.
• Manufacturer: South African Micro-Electronic Systems

ANALOG INPUT
The most important external components for any SAMES
integrated circuit are the current and voltage sense resistors, as
well as the bias setting resistors. These resistors must be of the
same type as specified in the parts list to ensure that
temperature effects and noise susceptibility is minimized.
VOLTAGE INPUT IVP
The voltage input is driven with a current of 14µA
to SA4102A) at the nominal rated mains voltage. Please note
that this input will saturate with currents bigger than
approximately 17µA
capability. This also ensures that the device will not saturate
with a 10% variance in mains voltage. The main voltage is
divided down via a resistor network (see Figure 2) to 14V
This voltage is fed to a 1M
14µA
The resistor values are chosen in such a way that shorting
jumper J2 leads to half the voltage on the voltage divider output.
This feature makes the module compatible for both 220V and
110V supply networks.
Ignoring jumper J2 results in the following equations:
RA = R5 + R6 + R7 + R10
RB = R8 || (R9 + 0.5P1)
http://www.sames.co.za
PM4100APD
RMS
.
NEUTRAL
LIVE IN
RMS
, which translates into a 20% overdrive
resistor (R8) to realize the
R5
RMS
Figure 2: Voltage divider circuit
(11µA
R6
RMS
RMS
RA
.
2/14
The center position of P1 is used in the equation to ensure that
calibration can be done by adjusting P1 to be higher or lower.
Combining the two equations gives:
(RA + RB)/220V = RB/14V
Values for resistors R9 = 12k , P1 = 20k
chosen.
Substituting the values result in:
RB = 26.29k
RA = RB x (220V/14V-1)
RA = 386.84k
Choosing standard resistor values for R5, R6, R7, R10 and
keeping in mind that J2 must half the output voltage leads to the
following values:
R5 = R7 = 82k
R6 = R10 = 100k .
R7
J2
RB
R10
R9
P1
J26
C1
R8
sames
sames
and R8 = 1M
is