UB2012 Просмотр технического описания (PDF) - Unisonic Technologies

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UB2012

ADVANCED LINEAR CHARGE MANAGEMENT IC FOR SINGLE AND TWO-CELL LITHIUM-ION AND LITHIUM-POLYMER

Unisonic Technologies 

UB2012

LINEAR INTEGRATED CIRCUIT

 APPLICATION INFORMATION(Cont.)

BATTERY TEMPERATURE MONITORING

The UTC UB2012 continuously monitors temperature by measuring the voltage between the TS and VSS pins.

A negative- or a positive-temperature coefficient thermistor (NTC, PTC) and an external voltage divider typically

develop this voltage. (See Fig. 9) The UTC UB2012 compares this voltage against its internal V(TS1) and V(TS2)

thresholds to determine if charging is allowed. (See Fig. 10) The temperature sensing circuit is immune to any

fluctuation in VCC, since both the external voltage divider and the internal thresholds (V(TS1) and V(TS2) ) are

referenced to VCC.

The resistor values of R(T1) and R(T2) are calculated by the following equations:

For NTC Thermistors:

RT1

=

5 × RTH × RTC

3 × (RTC - RTH )

(3)

RT 2

=

5 × RTH

[(2 ×RTC ) -

× RTC

(7 ×RTH )]

(4)

For PTC Thermistors:

RT1

=

5 × RTH × RTC

3 × (RTH - RTC )

(5)

RT 2

=

5 × RTH × RTC

[(2 ×RTH ) - (7 ×RTC )]

(6)

Where R(TC) is the cold temperature resistance and R(TH) is the hot temperature resistance of thermistor, as

specified by the thermistor manufacturer.

RT1 or RT2 can be omitted If only one temperature (hot or cold) setting is required. Applying a voltage between

the V(TS1) and V(TS2) thresholds to pin TS disables the temperature-sensing feature.

DC+

RSNS

BAT+

RT1

DC-

UTC

UB2012

SNS COMP

BAT

VCC

TS

CC

VSS

STAT

RT2

BAT-

Thermistor

Fig. 7 Temperature Sensing Circuits

Fig. 8 UTC UB2012 TS Input Thresholds

UNISONIC TECHNOLOGIES CO., LTD

www.unisonic.com.tw

11 of 17

QW-R121-018 .G

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