NCV4949A

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7

APPLICATION INFORMATION

Supply Voltage Transient

High supply voltage transients can cause a reset output

signal perturbation. For supply voltages greater than 8.0 V

the circuit shows a high immunity of the reset output against

supply transients of more than 100 V/

ms. For supply voltages

less than 8.0 V supply transients of more than 0.4 V/

ms can

cause a reset signal perturbation. To improve the transient

behavior for supply voltages less than 8.0 V a capacitor at

Pin 3 can be used. A capacitor at Pin 3 (C3

≤ 1.0 mF) also

reduces the output noise.

(optional)

C3

Regulator

2.0 V

2.0

mA

Reset

1.23 V

Sense

GND

Reset

38

4

6

7

5

2

1

+

-

+

-

Preregulator

6.0 V

10 k

W

Figure 14. Application Schematic

NOTE:

1.

2.