Datasheet ZXRE160 (Diodes) - 8

A Product Line of Diodes Incorporated ZXRE160 Application Information
The following show some typical application examples for the ZXRE160. Figure 3 shows a typical configuration for the ZXRE160 in comparator mode. Here the comparator switches low when:
T
+ FB V (R1 R2)
UC
≥ M V R 2 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 values of V M. R2 should be kept as low as possible to minimize errors due to the bias current of the FB pin.
NEW PROD
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.
Figure 3. 15V Supply Monitor
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 kΩ): R C2 2 ≥ MIN R + 3 (R1 2 ) μF R 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. ⎛ 1 R ⎞ V = V ⎜1+ ⎟ OUT V = REF V OUT REF ⎝ 2 R ⎠ − IN V OUT V 3 R = − IN V OUT V 3 R = R I 3 R I 3
Figure 4. 0.6V Shunt Regulator Figure 5. 1.0V Shunt Regulator
ZXRE160 8 of 15 June 2012 Document number: DS35688 Rev. 2 - 2
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