External Circuit Design

AN2317 - Application

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The primary current sensing circuit can be connected to mains as follows (see

Figure 3):

1.

The hot line voltage wire must be connected to pin F of the module.

Normally, this wire is also connected to the hot line current wire. However, during

production or to verify phases, this wire may be connected to some other line voltage

source.

2.

The neutral line voltage wire must be connected to pin N of the module.

This wire is also connected to the neutral line current wire.

3.

The hot line current wire must be placed through the current transformer TR1 hole

(becoming the hot load wire).

4.

The neutral line current wire must be placed through the current transformer TR2 hole.

Figure 3.

Current Sense Transformer-to-Power Line Connections

AI12298

Neutral Load

Hot Load

Neutral Line

Hot Line

P1

W6

Comp side

TR2

TR1

*

FN

W5