UB240L-AC-S08-R datasheet(5/11 Pages) UTC

5 / 11 page

UB240

Preliminary

CMOS IC

UNISONICTECHNOLOGIESCO.,LTD

5 of 11

www.unisonic.com.tw

QW-R502-A07.b



OPERATING

1. Overcharge Detection

OUT is turned to “H” (for CMOS output active “H”) when the voltage of one of the batteries exceeds the

overcharge detection voltage (VCU) during charging under normal conditions beyond the overcharge detection delay

time (tCU). This state is called “overcharge.” Attaching FET to the OUT pin provides charge control and a second

protection. At that time, the overcharge state is maintained until the voltage of all batteries decreases from the

overcharge detection voltage (VCU) by the equivalent to the overcharge hysteresis voltage (VCD).

2. Delay Circuit

The overcharge detection delay time (tCU) change with an external capacitor (CCD). The delay times are calculated

by the following equations：

Overcharge detection delay time tCU[s] = (15±5 )CCD [μF]



TIMING CHARTS

Battery voltage

V1 Battery

V2 Battery

V3 Battery

V4 Battery

VCD

VCU

OUT pin voltage

CD pin voltage

VSS

VCC

VDET

CMOS output active “H” and

Nch open drain models

VCC

tCU

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