Ricoh R3111x Series Uživatelský manuál stáhnout pdf (Strana 20)

R3114x

• Voltage level Indicator Circuit (lighted when the power runs out)

(Nch Open Drain Output)

R3114xxx1A

Series

GND

OUT

• Detector Threshold Adjustable Circuit 1

(Nch Open Drain Output)

R3114xxx1A

Series

GND

OUT

Adjustable Detector Threshold

=(−VDET)×(Ra+Rb)/Rb

Hysteresis Voltage

=(VHYS)×(Ra+Rb)/Rb

∗1) To prevent oscillation, set Ra

1k, Rb

100.

∗2) If the value of Ra is set excessively large, voltage drop

may occur caused by the supply current of IC itself,

and detector threshold and hysteresis voltage may

vary.

∗3) If Vup and VDD are connected, the voltage dropdown

caused by R

up, may cause difference in the hysteresis

voltage.

• Detector Threshold Adjustable Circuit 2

(Nch Open Drain Output)

R3114xxx1A

Series

GND

OUT

Adjustable Detector Threshold

=(−VDET)×(Ra+Rb)/Rb

Hysteresis Voltage

=(VHYS)×(Ra+Rb)/Rb

∗1) To prevent oscillation, set Ra

100k, C

0.01μF.

∗2) If the value of Ra is set excessively large, voltage drop

may occur caused by the supply current of IC itself,

and detector threshold and hysteresis voltage may

vary.

∗3) If Vup and VDD are connected, the voltage dropdown

caused by R

up, may cause difference in the hysteresis

voltage.

∗4) If the value of Ra, Rb and C are set excessively large,

the delay of the start-up may become too long.

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Ricoh R3111x Series Uživatelský manuál Strana 20

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