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參數(shù)資料
| 型號(hào)： | ICS1702MT |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | IC REG LDO 1A 9V SHTDN TO220FP-5 |
| 中文描述： | QuickSaver充電控制器的鎳鎘和鎳氫電池 |
| 文件頁數(shù)： | 20/28頁 |
| 文件大小： | 466K |
| 代理商： | ICS1702MT |
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20
ICS1702
With the batteries removed, the current source must be capable of
raising the voltage at the VIN pin above the voltage at the OPREF
pin to ensure proper polling. With the batteries installed, the
current source overshoot characteristics when turned on and off
must not cause the voltage at the VIN pin to exceed the voltage at
the OPREF pin. If the voltage at OPREF exceeds the voltage at
VIN when a charge pulse is applied or removed, the polling feature
will be activated.
PC Board Design Considerations
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. When designing the printed circuit board, make sure
ground and power traces are wide and bypass capacitors are used
right at the controller. 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
ICS1702
and the
constant current source control circuits outside the power and
return loop described above. These precautions will prevent high
circulating currents and coupled noise from disturbing normal
operation.
Selecting the Appropriate Termination Method
In general, the voltage slope termination method works best for
equipment where the battery is fast charged with the equipment off
or the battery is removed from the equipment for fast charge. The
temperature slope and maximum temperature termination methods
are for equipment that must remain operative while the battery is
fast charged.
Applications Information
To ensure proper operation of the
ICS1702
, external components
must be properly selected. The external current source used must
meet several important criteria to ensure optimal performance of
the charging system. The charging current should be constant when
using voltage slope termination. The current may vary when using
temperature slope termination.
VIN and OPREF Divider Resistors
Figure 15 shows a typical application using the
ICS1702
. R1
through R4 must be carefully selected to ensure that battery
detection and voltage termination methods operate properly.
R1 and R2 are selected to scale the battery voltage down to the
voltage of one cell. The following table shows some typical values.
Additional information is available in the
Voltage Input
section.
Cells
1
2
3
4
5
6
7
8
R1
Short
2.0k
2.0k
3.0k
12k
10k
12k
9.1k
R2
Open
2.0k
1.0k
1.0k
3.0k
2.0k
2.0k
1.3k
If using voltage slope termination, the current source should
prevent ripple voltage from appearing on the battery. The effects of
ripple on the battery voltage may interfere with proper operation
when using the voltage slope method.
R3 and R4 are used to set the open circuit (no battery) reference
voltage on the OPREF pin. The function of this pin is discussed in
the
Open Circuit Reference
section.
V
OPREF
1.86 V
1.92 V
1.97 V
2.00 V
2.03 V
2.10 V
2.14 V
2.22 V
R3
2.2k
2.4k
2.0k
3.0k
2.2k
1.8k
2.4k
3.0k
R4
1.3k
1.5k
1.3k
2.0k
1.5k
1.3k
1.8k
2.4k
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