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L5150CS Fiches technique(PDF) 16 Page - STMicroelectronics

No de pièce L5150CS
Description  5 V low dropout voltage regulator
PDF  34 Pages
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Fabricant  STMICROELECTRONICS [STMicroelectronics]
Site Internet  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L5150CS Fiches technique(HTML) 16 Page - STMicroelectronics

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Application information
L5150CJ / L5150CS
16/34
Doc ID 15542 Rev. 15
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.



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