RESET CIRCUIT

The block circuit diagram of the reset circuit is

shown in Figure 3. The reset circuit supervises

the output voltage. The reset threshold of 4.5V is

defined with the internal reference voltage and

standby output divider.

=

2

The reaction time of the reset circuit originates

from the discharge time limitation of the reset ca-

The reaction time of the reset circuit increases the

noise immunity.Standby output voltage drops be-

low the reset threshold only a bit longer than the

reaction time results in a shorter reset delay time.

The nominal reset delay time will be generated for

standby output voltage drops longer than approxi-

mately 50

µs. The typical reset output waveforms

are shown in Figure 4.

Figure 3

Figure 4

L4925

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