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參數(shù)資料
| 型號： | MAX2003A |
| 廠商： | Maxim Integrated Products, Inc. |
| 元件分類： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | Fast-Charge Battery Chargers(NICD/NIMH,可充電池數(shù)1~16個,電池快速充電器) |
| 中文描述： | 快速充電電池充電器（鎳鎘/鎳氫電池，可充電池數(shù)1?16個，電池快速充電器） |
| 文件頁數(shù)： | 11/20頁 |
| 文件大?。?/td> | 191K |
| 代理商： | MAX2003A |
Negative Delta Voltage Termination
The Negative Delta Voltage Termination (-
V) method
measures a negative delta voltage to determine termi-
nation of fast-charge. After maximum charge is
reached, the terminal voltage of NiCd batteries
declines significantly, whereas the terminal voltage of
NiMH batteries does not. Hence, the -
V method of
fast-charge termination is suitable for NiCd batteries,
but not for NiMH batteries.
The MAX2003/MAX2003A sample the BAT pin every 34
seconds and compare it with all previous values. If the
new value is less than any of the previous values by
more than 12mV, a negative delta voltage has been
detected and fast-charge is terminated.
Note: This method of charge termination is valid only
when the voltage at BAT is between V
MCV
and V
MCV
-
0.2V
CC
.
The -
V method is inhibited during the hold-off time to
prevent false termination of fast-charge. The hold-off
time depends on the charge rate used, and is selected
by the inputs TM1 and TM2 (as shown in Table 4). After
the hold-off time has expired, the device begins to
monitor BAT for a voltage drop.
Maximum Temperature Termination
The Maximum Temperature Termination method is used
as a safety net to prevent problems, and should never
be needed under normal operation of the charger. The
maximum temperature that the battery can reach during
fast-charge has a corresponding voltage—the tempera-
ture cutoff voltage (V
TCO
), as seen in Figure 5. This volt-
age is set externally at the TCO pin using a resistor
divider from V
CC
. Although rarely experienced, an
excessively low temperature will also terminate fast-
charge. The minimum temperature is the low tempera-
ture fault (V
LTF
). This value is internally set at 0.4V
CC
.
When the thermistor exceeds these temperature limits,
fast-charge is terminated. The thermistor configuration
shown in Figure 5 is used to measure the battery’s tem-
perature and scale it to operate from V
LTF
to V
TCO
.
Resistors R
T1
and R
T2
are calculated to provide the
required cutoff at V
TCO
. See the Design Guide section
for a detailed design example.
Maximum Voltage Termination
The Maximum Voltage Termination method is another
safety feature designed to work if something is drastically
wrong. Under normal operation of the charger, this condi-
tion should only be reached when the battery is removed.
The maximum cell voltage expected is applied at the
MCV pin using a resistor-divider network. If the cell volt-
age measured at BAT exceeds that at MCV, fast-
charge is terminated. For most applications using both
NiCd and NiMH batteries, this voltage (V
MCV
) can be
set to 1.9V.
The MAX2003/MAX2003A do not terminate fast-charge
if the maximum voltage is reached before the hold-off
time has expired. If the cell voltage is greater than the
MCV during the hold-off time, the device will continue
fast-charge until the hold-off time has expired, and then
it will terminate fast-charge. The hold-off time is deter-
mined by the inputs TM1 and TM2, as shown in Table 4.
Maximum Timeout Termination
The final method is Maximum Timeout Termination,
which (like the maximum voltage and maximum tem-
perature methods) is another backup safety feature.
The timeout time depends on the charge rate selected
and is set by the control signals TM1 and TM2. Table 4
shows a list of different timeout periods available for dif-
ferent control-signal inputs. If the timeout is reached
before any other termination method is seen, fast-
charge is terminated to protect the charger and battery.
T op-Off Charge
Top-off charge is used to provide the last bit of charge
needed to reach full capacity after fast-charge is termi-
nated. Top-off charging puts slightly more energy into
the battery than simple trickle charging, and can be
used for both NiCd and NiMH batteries. Select it by
choosing the appropriate control signals on TM1 and
TM2 (Table 4).
M
NiCd/NiMH Battery Fast-Charge Controllers
______________________________________________________________________________________
11
*Enable
100
23
4C
V
CC
V
CC
Disable
100
23
*Enable
410
90
*Enable
200
45
2C
V
CC
Open
C
V
CC
GND
*Enable
820
180
C/2
Open
V
CC
4C
Open
Open
Disable
410
90
Disable
200
45
2C
Open
GND
C
GND
V
CC
Disable
820
180
C/2
GND
Open
Disable
Top-Off
Charge
140
Hold-Off
Time
V/MCV
(sec)
360
Fast-
Charge
Timeout
(min)
TM1
C/4
GND
GND
Fast-
Charge
Rate
TM2
Table 4. Programmable Inputs for
Timeout/Hold-Off/Fast-Charge/Top-Off/
Pulse Trickle (V
CC
= 5V)
0.5
1
0.5
0.5
0.5
1
1
1
Disable
MAX2003A
Trickle
Charge (s)
On/Off
* MAX2003 is on for 4sec and off for 30sec.
MAX2003A is on for 0.5sec and off for 3.5sec.
16
32
64
128
16
32
64
128
544
MAX2003A
Sampling
Interval
(sec)
544
136
68
68
544
136
68
68
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX2003AC/D | 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:NiCd/NiMH Battery Fast-Charge Controllers |
| MAX2003ACPE | 制造商:Maxim Integrated Products 功能描述: |
| MAX2003ACSE | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
| MAX2003ACWE | 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:NiCd/NiMH Battery Fast-Charge Controllers |
| MAX2003ACWE+ | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
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