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bq769x0 Circuit Module Use
6.2
Minimum Operating Voltage
The minimum operating voltage for the EVM is listed in the characteristics table is much higher than the
minimum operating voltage since the EVM requires a sufficient VC5X voltage to provide a suitable
REGSRC voltage to drive the DSG and CHG signals. The board can be operated at lower voltage to read
cell voltages if the power FETs are not used. When the board is to be operated with low cell counts,
provide an adequate REGSRC voltage to prevent damage to the board. When appropriate, R75 may be
removed and installed at R74 for a higher REGSRC voltage, or Q14 bypassed at the J10 test point
pattern. Modification of the board limits its voltage range.
CAUTION
Do not operate the board with current below the minimum operating voltage. If
modified for low voltage operation, do not operate the board at its normal upper
voltage limit. Operation of the board with voltages outside the operating range
of the components on the board can damage the circuit module.
6.3
Evaluating with Simulated Current
The
describes connection for basic operation. Providing more than recognizable current
in that configuration can require a power supply with a significant power rating. Applying a charge current
can damage some power supplies. The figure below shows a method to force current through the control
path without a high wattage power supply or special equipment. The
load
power supply should be set at a
low voltage in a constant current mode. Polarity can be reversed on the
load
supply to simulate a charge
current. The
battery
supply should never be reversed.
27
SLVU925B – April 2014 – Revised July 2014
bq76930 and bq76940 Evaluation Module User's Guide
Copyright © 2014, Texas Instruments Incorporated