TLE 4471

Data Sheet Rev. 1.1

20

2001-09-06

Figure 5

Reset Timing

The reset output is an open collector output with a pullup-resistor of typical 4 k

Ω to Q1.

An external pullup can be added with a resistor value of at least 20 k

Ω.

In addition the reset switching threshold can be adjusted by an external voltage divider.

The feature is useful with microprocessors which guarantee safe operation down to

voltages below the internally set reset threshold of 4.65 typical.

AED03045

Thermal

Power-on-Reset

Voltage Dip

Secondary

Overload

at Output

Spike

V

D

V

Q

Q, rth

V

<

rr

t

at Input

Undervoltage

Shutdown

DR, dt

V

t

t

t

t

V

RO