Cirrus-logic CDB5490U Uživatelský manuál stáhnout pdf (Strana 12)

CDB5490U

12 DS923DB5

1.6 Typical Sensor Connections

The CDB5490U evaluation board provides connections directly to several types of sensors. Flexible on-

board filter networks provide a convenient configuration for three common transducers: current shunt, cur-

rent transformer (CT), or Rogowski coil.

1.6.1 Shunt Power Meter Example

An inexpensive current shunt configuration is easily achievable with the CDB5490U evaluation board.

Figure 6 depicts the voltage and current connections for a shunt sensor and its associated filter configu-

rations.

It is strongly recommended that a low-side (neutral path) current shunt is used — especially in high-volt-

age situations. Make sure that all signals are well connected before the power source is turned on. Ex-

treme care should be taken when connecting high-voltage signals to the CDB5490U 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 CS5490 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).

IIN-

IIN+

GND

LINE

CS5490

CDB5490U

PHASE

NEUTRAL

J11

0.033UF

0.027UF

R11

NO POP

100

NO POP

R13

NO POP

422K

R12

422K

R14

422K

R15

422K

R49 1K

R50 1K

C34

0.033UF

C35

0.033UF

J44

J46

R51

J45

J53

J54

SHUNT

IIN+

IIN-

VIN-

VIN+

Figure 6. Shunt Sensor Power Meter

1 2 ... 7 8 9 10 11 12 13 14 15 16 17 ... 45 46

CDB5490U 1

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