Cirrus Logic CDB5480U - Manual (Page 11)

CDB5480U
DS893DB5 11
1.6 Typical Sensor Connections
The CDB5480U evaluation board provides connections directly to several types of sensors. Flexible
onboard filter networks provide a convenient configuration for three common transducers, including
current shunt, current transformer (CT), or Rogowski coil.
1.6.1 Shunt Power Meter Example
A low-cost current shunt configuration is easily achievable with the CDB5480U evaluation board.
Figure 6 depicts the voltage and current connections for a shunt sensor and its associated filter
configurations.
It is strongly recommended that a low-side (neutral path) current shunt is used — especially in high-
voltage situations. Make sure that all signals are well connected before the power source is turned on.
Extreme care should be taken when connecting high-voltage signals to the CDB5480U evaluation board.
In this configuration it is unnecessary to use a burden resistor. A single anti-alias filter is all that is required
for the current channel. Below the filter corner frequency, the CS5480 inputs will see the same voltage
that is across the shunt. Therefore, the shunt voltage should be kept below the maximum of 50mVp with
I-Channel PGA = 50x. A 10% margin is recommended for the shunt voltage (45mVp).
Figure 6. Shunt Sensor Power Meter
IIN1-/IIN2-
IIN1+/IIN2+
GND
GND
GND
LINE
CS
5480
CDB5480U
PH
AS
E
NEU
TRA
L
J1/J12
J4
J7/J13
J8/J14
J11
J6
R5
1K
C5/C11
0.033UF
C6/C12
0.033UF
C9
0.027UF
C4
0.027UF
R11/R22
NO POP
R1/R21
100
R2/R22
100
R7 1K
R6 1K
R9/R23
NO POP
R13/R24
NO POP
R8 422K R12 422K R14 422K R15 422K
R49/R52 1K
R50/R53 1K
C34/C1
0.033UF
C35/C2
0.033UF
J44/J51
J46/J52
R51/
R54
0
J45
J53/J56
J54/J55
SHUNT
IIN1+/IIN2+
IIN1-/IIN2-
VIN-
VIN+