Datasheet

Application information L5150CJ / L5150CS
16/34 Doc ID 15542 Rev. 15
3.2 Reset
The reset circuit monitors the output voltage V
o
. If the output voltage becomes lower than
V
o_th
then R
es
goes low with a delay time (t
rr
). When the output voltage becomes higher
than V
o_th
then R
es
goes high with a delay time t
rd
. This delay is obtained by 32 periods of
oscillator. The oscillator period is given by:
Equation 1
T
osc
= [(V
Rhth
- V
Rlth
) x C
tr
] / I
cr
+ [(V
Rhth
- V
Rlth
) x C
tr
] / I
dr
where:
I
cr
= 20 µA is an internally generated charge current,
I
dr
= 20 µA is an internally generated discharge current,
V
Rhth
= 2.5 V (typ) and V
Rlth
= 0.9 V (typ) are two voltage thresholds,
C
tr
is an external capacitor put between V
cr
pin and GND.