LTC3300-2_15 Datasheet, PDF (8/42 Pages) Linear Technology – Addressable High Efficiency Bidirectional Multicell Battery Balancer

LTC3300-2
TYPICAL PERFORMANCE CHARACTERISTICS T_A = 25°C unless otherwise specified.
Balancer Efficiency
vs Cell Voltage
93
DC2064A DEMO BOARD
I_CHARGE = I_DISCHARGE = 2.5A
FOR 12-CELL STACK ONLY
92
91
90
89
2.8 3.0
DISCHARGE, 12-CELL STACK
DISCHARGE, 6-CELL STACK
CHARGE, 6-CELL STACK
CHARGE, 12-CELL STACK
3.2 3.4 3.6 3.8 4.0 4.2
VOLTAGE PER CELL (V)
33002 G19
Typical Charge Waveforms
I1S
50mV/DIV
I1P
50mV/DIV
PRIMARY
DRAIN
50V/DIV
SECONDARY
DRAIN
50V/DIV
2µs/DIV
DC2064A DEMO BOARD
I_CHARGE = 2.5A
T=2
S = 12
33002 G21
Balance Current vs Cell Voltage
2.7
CHARGE, 12-CELL STACK
2.6
2.5
DISCHARGE, 12-CELL STACK
2.4
DISCHARGE, 6-CELL STACK
2.3
DC2064A DEMO BOARD
I_CHARGE = I_DISCHARGE = 2.5A
FOR 12-CELL STACK ONLY
2.2
CHARGE, 6-CELL STACK
2.1
2.8 3.0 3.2 3.4 3.6 3.8 4.0 4.2
VOLTAGE PER CELL (V)
33002 G20
Typical Discharge Waveforms
I1P
50mV/DIV
I1S
50mV/DIV
SECONDARY
DRAIN
50V/DIV
PRIMARY
DRAIN
50V/DIV
2µs/DIV
DC2064A DEMO BOARD
I_DISCHARGE = 2.5A
T=2
S = 12
33002 G22
Protection for Broken Connection
to Cell While Charging
C1 PIN
1V/DIV 3.6V
G1P
2V/DIV
~5.2V
CONNECTION TO
C1 BROKEN
BALANCING
SHUTS OFF
Protection for Broken Connection
to Secondary Stack While
Discharging
SECONDARY
STACK VOLTAGE
10V/DIV _43.2V
G1P
2V/DIV
~66V
CONNECTION TO
STACK BROKEN
BALANCING
SHUTS OFF
Changing Balancer Direction
“On the Fly”
SCKI
5V/DIV
I1P
50mV/DIV
CHARGING
2ms
DISCHARGING
G1P
2V/DIV
50µs/DIV
33002 G23
500µs/DIV
33002 G24
20µs/DIV
33002 G25
33002f
8
For more information www.linear.com/LTC3300-2