Texas Instruments bq76200, Руководство пользователя, Страница: 7 / 21

Csys
Bipolar Power
Supply
+ -
³EDWWHU\´
Bipolar Power
Supply
+ -
³FKDUJHU´
RU³ORDG´
Cload
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Additional Evaluation Setups
3 Additional Evaluation Setups
CAUTION
The bq76200 EVM does not contain capacitors on the input or output current
paths to dampen transients. Be sure to use appropriate capacitance (Csys and
Cload in the following diagrams) to avoid damage to the board from cable or
equipment transient responses during evaluation.
3.1 Operation With Charge and Discharge Currents
If bipolar power supplies are available, current control can be demonstrated through the board in both
directions, see
Figure 2 . A battery voltage in range must be applied to the BAT side of the EVM for
operation. The instrument on the PACK side can be used as a load if it is set to a lower voltage than the
battery side or as a charger if set to a higher voltage.
Figure 2. Bipolar Operation
3.2 Connecting to a BMS System
The bq76200 EVM may be connected to a BMS board so that the BMS device can provide the control
signals for the bq76200, a concept is shown in
Figure 3 . The J7 header or J8 terminal block may be useful
to connect signals to the bq76200 EVM, refer to the documentation for the BMS board to determine where
to connect and how to interface the signals. Ensure that the BMS settings are correctly changed to match
the pack and application for the solution being evaluated and the bq76200 EVM limits. The J6 shunt
should be removed since the BMS board will provide control signal levels. The pull-down resistor patterns
on the bq76200 EVM inputs may be populated, if needed, for the evaluation.
When connecting to the BMS board, the J3 shunt should be removed. The R1 resistor will be in parallel
with the sense resistor through the path of the signal ground connected at J7 or J8. Generally, this should
be OK since the current error would be
≈ 1 ppm with a 1-m Ω sense resistor or ≈ 10 ppm with a 10-m Ω
sense resistor. However, connect the board grounds as appropriate for the evaluation.
7 SLVU926 – July 2015 bq76200 High Voltage Battery Pack Front-End Charge/Discharge High-Side
NFET Driver Evaluation Module
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