ICS1700AEB Galaxy Power, Inc., ICS1700AEB Datasheet - Page 4

• Manufacturer Part Number: ICS1700AEB
• Description: Ics1700a Evaluation Board.
• Manufacturer: Galaxy Power, Inc.

ICS1700A Evaluation Board
Design Considerations
When designing external current source circuitry for use with the
ICS1700A, there are several important considerations to make
before starting the design and the PC board layout.
For the 2C and 4C charge rates, consideration has to be given to
the use of a pulse-width modulated switch mode current source in
order to reduce size and power dissipation. Switch mode current
sources can provide the ability to charge battery packs that require
voltages higher than the primary supply. For instance, to charge a
24 volt battery from a 12 volt vehicle battery, a switch mode boost
converter could be used.
In general, linear chargers are less complex and more cost
effective, but less efficient than switch mode chargers. For the 1C
and C/2 charge rates, consideration should be given to using a
linear charger unless the size and ability to dissipate heat are not
available.
It is very important that care be taken to minimize noise coupling
and ground bounce. In addition, wires and connectors can add
significant resistance and inductance to the charge and discharge
circuits.
4
When designing the printed circuit board, make sure ground and
power traces are wide and bypass capacitors are used right at the
controller pins. Use separate grounds for the signal, charge, and
discharge circuits. Separate ground planes on the component side
of the PC board are recommended. Be sure to connect these
grounds together at the negative lead of the battery only.
For the discharge circuit, keep the physical separation between
power and return (ground) to a minimum to minimize field
radiation effects. This precaution is also applicable to the constant
current source, particularly if it is a switch mode type. Keep the
ICS1700A and the constant current source control circuits outside
the power and return loops described above. These precautions
prevent high circulating currents and coupled noise from disturbing
proper operation.
Galaxy Power, Incorporated wants to help create a successful
battery charging solution using the ICS1700A. If you need
technical advice or applications information, call the Intelligent
Charging Solutions hotline at GPI, [phone] x-277.
Ordering Information
ICS1700AEB
Device type:
ICS1700A Evaluation Board