Linear Technology DC2100A Demo Manual page 10

DEMO MANUAL DC2100A
Quick start proceDure
Cell Balancer Performance Measurements
Table 2 through Table 5 present the typical operational
data for a 12 cell and 6 cell balancer in both Discharge and
Charge modes. The cell voltages were 3.6V and measure-
ments of Cell Current, Stack Current, Operating Frequency
were taken and transfer Efficiency was calculated from
the data. Figure 15 through Figure 18 are actual in-circuit
waveforms taken on Cell 1 and Cell 7 while operating in
both modes. The waveforms present voltage on the pri-
mary side and secondary side MOSFET's drain to source
voltage and the primary side and secondary side current
sense inputs to the LTC3300-1.
Figure 14 through Figure 22 are cell and stack currents
taken over a range of cell voltages from 2.6V to 4.0V. The
R and R resistors were set for 2.6V cell voltage
TONP TONS
operation. All cells were set to the cell voltage under test.
The slight negative slope in current at higher voltages is
due to the increased operating frequency and the circuit
delays and dead time becoming a higher percentage of
the operating period.
Table 2. Typical 12 Cell Discharge Data
Cell I (A) Stack I
(A)
4.250 0.311
Figure 15. 12 Cell Discharge Waveforms
10
Frequency Efficiency
(KHz)
95.7 87.9%
Table 3. Typical 12 Cell Charge Data
Cell I (A) Stack I
(A)
3.960 0.367
Figure 16. 12 Cell Charge Waveforms
Table 4. Typical 6 Cell Discharge Data
Cell I (A) Stack I
(A)
4.000 0.577
Figure 17. 6 Cell Discharge Waveforms
Frequency Efficiency
(KHz)
106.6 89.7%
Frequency Efficiency
(KHz)
88.6 88.4%
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