L5150GJ
Application information
3.2
Reset
The reset circuit monitors the output voltage Vo. If the output voltage becomes lower than
Vo_th then Res goes low with a delay time (trr). When the output voltage becomes higher
than Vo_th then Res goes high with a delay time trd. This delay is obtained by 32 periods of
oscillator.
The oscillator period is given by:
Equation 1
Tosc = [(VRhth - VRlth) x Ctr] / Icr + [(VRhth - VRlth) x Ctr] / Idr
where:
Icr = 20 µA is an internally generated charge current,
Idr = 20 µA is an internally generated discharge current,
VRhth = 2.5 V (typ) and VRlth = 0.9 V (typ) are two voltage thresholds,
Ctr is an external capacitor put between Vcr pin and GND.
Doc ID 15540 Rev. 12
17/29