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參數(shù)資料
| 型號： | 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)： | 9/28頁 |
| 文件大?。?/td> | 466K |
| 代理商： | ICS1702MT |
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9
ICS1702
Battery Detection
Upon power-up or after a master reset, excess charge from output
filter capacitors at the charging system terminals is removed with a
series of discharge pulses. After the discharge pulse sequence is
complete, the voltage at VIN must be greater than 0.5V when a
battery is present. If the voltage at the pin is less than 0.5V, the
ICS1702
assumes no battery is present, and the polling detect
mode is initiated. No indicator is active during the discharge
pulses.
The
ICS1702
enters the polling detect mode and applies a
100ms charge pulse. During the pulse, the
ICS1702
monitors the
VIN pin to determine if the divided down terminal voltage is above
OPREF. If the battery is present, the voltage will be clamped below
the reference on OPREF while the current pulse is applied. If a
battery is not present, the voltage at VIN will rise above the
reference at OPREF.
The charge pulse will repeat until the battery is reinstalled. The
polling detect indicator (PFN) is the only indicator active as long as
the
ICS1702
is in the polling detect mode. Once a battery is
installed, the
ICS1702
will turn off the PFN indicator and enter the
soft start stage. The
ICS1702
will automatically reenter the polling
detect mode if the battery is removed.
Battery Removal
During the application of a charge pulse, the voltage at the VIN pin
is compared to the voltage at the OPREF pin. If the voltage at VIN
is greater than the voltage at OPREF during the application of the
current pulse, then the battery is assumed to have been removed
and the
ICS1702
enters the polling detect mode. If the voltage at
VIN is below the voltage at OPREF, the charging mode continues.
When in the topping charge or maintenance charge stages, a charge
pulse may not occur for several seconds. During the period
between charge pulses, the voltage at VIN must be greater than
0.5V if a battery is attached. If the voltage at VIN is less than 0.5V,
the
ICS1702
assumes the battery has been removed, and the
polling detect mode is initiated.
Auxiliary Modes of Operation
The
ICS1702
allows six alternate modes of operation to help
customize the charging system for certain applications. The tri-
level AUX0 and AUX1 pins are used to select the operating mode.
The AUX0 and AUX1 pins default the
ICS1702
into fast charge
operation. Except for the discharge-to-charge mode, another mode
can only be selected by re-programming and resetting the
controller.
Discharge-to-Charge Mode
The time required for discharge depends on the energy in the battery
and the discharge rate. The discharge is not limited by a timer. This
allows the user to set the discharge rate. The battery is drained to 1
volt/cell as read at the VIN pin under load and then the controller
enters soft start at a charge rate set by the SEL0 and SEL1 inputs. The
discharge load is activated by the DCHG pin which goes low for about
400ms every second. A resistor value selected for a 2.5C discharge
based on 1.4V/cell results in about a 1C discharge rate.
The discharge-to-charge mode can be entered by placing the
AUX0 pin high (H) and the AUX1 pin low (L) with the SEL0 and
SEL1 inputs set for the desired fast charge rate. This setting initializes
the discharge sequence. The
ICS1702
enters the discharge-to-charge
mode at initial power-up or with a master reset. The discharge mode
occurs first, to be followed by the selected fast charge mode. During
discharge, the MMN indicator flashes at a one second rate, while
during the soft start and fast charge stages the CMN indicator is
activated continuously.
Four charge modes are available after the discharge portion is complete
by changing the state of the AUX inputs during the discharge portion
of this mode. The available charge modes are:
Fast Charge: Leave the AUX inputs open (Z).
Direct Maintenance Mode: Set the AUX0 low (L) and AUX1 high
(H).
Condition Mode: Set AUX0 high (H) and AUX1
open (Z).
Ten-Hour Timer Mode: Set AUX0 high (H) and AUX1 high (H).
If the battery is removed while in the discharge-to-charge mode, the
ICS1702
will continually reset itself until the battery is reinstalled. See
Application Information
for more information.
Discharge-Only Mode
The time required for discharge depends on the energy in the battery
and the discharge rate. The discharge is not limited by a timer. This
allows the user to set the discharge rate. The battery is drained to 1
volt/cell as read at the VIN pin under load. The
ICS1702
shuts down
after the discharge sequence is finished and a master reset must be
performed to reactivate the device. The discharge load is activated by
the DCHG pin which goes low for about 400ms every second. A
resistor value selected for a 2.5C discharge based on 1.4V/cell results
in about a 1C discharge rate. The discharge-only mode can be entered
by placing the AUX0 pin open (Z) and the AUX1 pin low (L). The
ICS1702
enters this mode at initial power-up or with a master reset.
During the discharge portion, the MMN indicator flashes at a one
second rate.
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| ICS1702N | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:QuickSaver Charge Controller for Nickel-Cadmium and Nickel-Metal Hydride Batteries |
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| ICS1708N | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:QuickSaver Charge Control IC for Nickel-Cadmium and Nickel-Metal Hydride Batteries |
| ICS1708S | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:QuickSaver Charge Control IC for Nickel-Cadmium and Nickel-Metal Hydride Batteries |
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