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UB291G-XX-AG6-R Datasheet(PDF) 6 Page - Unisonic Technologies

No. de Pieza. UB291G-XX-AG6-R
Descripción  Charger Detection Voltage
Descarga  9 Pages
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Fabricante  UTC [Unisonic Technologies]
Página de inicio  http://www.utc-ic.com
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UB291G-XX-AG6-R Datasheet(HTML) 6 Page - Unisonic Technologies

   
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UB291
Preliminary
CMOS IC
UNISONICTECHNOLOGIESCO.,LTD
6 of 9
www.unisonic.com.tw
QW-R128-002.b
OPERATION (Cont.)
3. Discharging overcurrent detector, Short detector
In the state of chargable and dischargabe, if the VM terminal voltage becomes higher than the discharging
overcurrent detection voltage (VDET3) by short of loads, etc., it will detect discharging overcurrent state. If the VM
terminal voltage becomes higher than short detection voltage (Typ.0.5V), it will detect discharging overcurrent state,
too. And then the DO terminal outputs low level, so the external discharging control Nch MOSFET turns OFF, and it
protects from large current discharging.
The discharging overcurrent detection has delay time decided internally. When the VM terminal voltage becomes
higher than the discharging overcurrent detection voltage, it will not detect discharging overcurrent, if the VM terminal
voltage becomes lower than the discharging overcurrent detection voltage within the discharging overcurrent
detection delay time (Typ.8ms). Moreover, the discharging overcurrent release delay time (Typ.1ms) exists, too.
The short detection delay time (Typ.500us) decided internally exists, too.
The discharging overcurrent release resistance (Typ.50kohm) is built into between VM terminal and VSS terminal.
In the state of discharging overcurrent or short, if the load is opened, VM terminal is pulled down to the VSS via the
discharging overcurrent release resistance. And when the VM terminal voltage becomes lower than the discharging
overcurrent detection voltage, it will automatically release discharging overcurrent or short state. The discharging
overcurrent release resistance turns ON, if discharging overcurrent or short is detected. On the normal state
(chargable and dischargable state), the discharging overcurrent release resistance is OFFed.
4. Charging overcurrent detector
In the state of chargable and dischargable, if the VM terminal voltage becomes lower than charging overcurrent
detection voltage (Typ.-0.100V) by abnormal voltage or current charger, etc., it will detect charging overcurrent state.
And then the CO terminal outputs low level, so the external charging control Nch MOSFET turn OFF, and it protects
from large current charging.
It release charging overcurrent state, if the abnormal charger is disconnected, and the load is connected.
The charging overcurrent detection has delay time decided internally. When the VM terminal voltage becomes lower
than the charging overcurrent detection voltage, it will not detect charging overcurrent, if the VM terminal voltage
becomes higher than the charging overcurrent detection voltage within the charging overcurrent detection delay time
(Typ.8ms). Moreover, the charging overcurrent release delay time (Typ.1ms) exists, too.
5. DS (Delay Shortening) function
The delay time of overcharge detection and overdischarge detection can be shortened by making the DS pin to
VDD level voltage. In the DS pin, the pull-down resistance of 15kohm is connected between VSS. Please open the DS
pin when using usually.


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