BQ29209-Q1 Datasheet, PDF (13/23 Pages) Texas Instruments – Voltage Protection with Automatic Cell Balance

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bq29209-Q1
SLUSC62A – JUNE 2015 – REVISED MARCH 2016
9.2.1.3 Application Curve
2
1
0
±1
±2
±3
±4
±5
±6
-40
VC1 V(PROTECT)
VC2 V(PROTECT)
0
25
60
110
Operating Temperature (ƒC)
C001
Figure 10. Average V_PROTECT Accuracy (V_OA) Across Operation Temperature
9.3 System Example
9.3.1 External Cell Balancing
Higher cell balancing currents can be supported by means of a simple external network, as shown in Figure 11.
CELL2
CELL1
RCB_ EXT
RIN
RIN
Q1
RCLAMP
Q2
1 VC2
CIN
2 VC1
CIN
3 VC1_CB
OUT 8
VDD 7
CB_ EN 6
4 CD
CCD
GND 5
PWR PAD
Figure 11. External Cell Balancing Configuration
PACK +
RVD
CVD
PACK ±
R_CLAMP ensures that both Q1 and Q2 remain off when balancing is disabled, and should be sized above 2 kΩ to
prevent excessive internal device current when the balancing network is activated. R_{CB_EXT} determines the value
of the balancing current, and is dependent on the voltage of the balanced cell, as follows:
Ibal
=
VCELL
R_{CB _EXT}
10 Power Supply Recommendations
The recommended power supply for this device is a maximum 10-V operation on the VDD input pin.
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