ZXRE160

Document number: DS35688 Rev. 2 - 2

8 of 15

www.diodes.com

June 2012

© Diodes Incorporated

ZXRE160

A Product Line of

Diodes Incorporated

Application Information

The following show some typical application examples for the ZXRE160.

Figure 3. 15V Supply Monitor

Figure 3 shows a typical configuration for the ZXRE160 in comparator

mode.

Here the comparator switches low when:

(

)

2

2

1

FB

M

R

R

R

V

V

+

≥

Alternative values of R1, R2 may be used to provide different threshold

voltages. R3 can also be adjusted to set the bias current for different

due to the bias current of the FB pin.

This circuit has no hysteresis, so a small capacitor of approx.4.7nF

between FB and GND is recommended to provide cleaner transitions at

the output.

In shunt regulator mode it is necessary to include the compensation capacitor C2 to guarantee stability. C2 may range in value from 0.1µF to

10µF depending on the application. The minimum value of C2 can be determined from the following equation (resistor values are in k

Ω):

()

μF

R

R

R

R

C2

2

1

3

2

MIN

+

≥

Both C1 and C2 should be as close to the ZXRE160 as possible and connected to it with the shortest possible track. In the case of Figure 10 and

Figure 11, it means the opto-coupler will have to be carefully positioned to enable this.

REF

OUT

V

V

=

3

R

OUT

IN

I

V

V

3

R

−

=

Figure 4. 0.6V Shunt Regulator

⎟

⎠

⎞

⎜

⎝

⎛ +

=

2

R

1

R

1

V

V

REF

OUT

3

R

OUT

IN

I

V

V

3

R

−

=

Figure 5. 1.0V Shunt Regulator