AN2317 - Application

External Circuit Design

21/27

When these application parameters are considered:

f = 50Hz, and

Equation 32

Selecting components in the circuit is a critical consideration. As a general rule, components

should be sized at twice the maximum power calculated for each device.

Zener diode, the results required to make the selection are expressed as follows:

Equation 33

and

Equation 34

Thus, a ZMM SOD 80*5.1V G Zener Diode is used.

I

IN

15.7mA

=

V

DD

I

IN

2

R

1

0.02W

=

⋅

=

P

D3

V

D3

I

IN

5.1 0.0157

0.08W

=

⋅

=

⋅

=