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參數(shù)資料
| 型號： | LTC4010CFE#PBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | High Efficiency Standalone Nickel Battery Charger; Package: TSSOP; No of Pins: 16; Temperature Range: 0°C to +70°C |
| 中文描述： | BATTERY CHARGE CONTROLLER, 615 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封裝： | 4.40 MM, LEAD FREE, EXPOSED PAD, PLASTIC, TSSOP-16 |
| 文件頁數(shù)： | 14/24頁 |
| 文件大?。?/td> | 212K |
| 代理商： | LTC4010CFE#PBF |
21
LTC4010
4010fa
charge timer and internal termination control are sus-
pended if pause is asserted (VTEMP < 200mV), but all
status outputs continue to indicate charging is in progress.
The fast charge state continues until the selected voltage
or temperature termination criteria are met. Figure 9 sug-
gests termination based on
T/t, which for NiMH would
be an increase greater than 1
°C per minute.
Because NiMH charging terminated due to
T/t and the
fast charge cycle had lasted more than tMAX/12 minutes,
the LTC4010 begins a top-off charge with a current of
IPROG/10. Top-off is an internally timed charge of tMAX/3
minutes with the CHRG output continuously asserted.
Finally, the LTC4010 enters the automatic recharge state
where the CHRG output is deasserted. The PWM is dis-
abled but VCDIV remains asserted to monitor VCELL. The
charge timer will be reset and fast charging will resume if
VCELL drops below 1.325V. The LTC4010 enters shutdown
when the DC adapter is removed, minimizing current draw
from the battery in the absence of an input power source.
While not a part of the sample waveforms of Figure 9,
temperature qualification is an ongoing part of the charg-
ing process, if an external thermistor network is detected
by the LTC4010. Should prescribed temperature limits be
exceeded during any particular charging state, charging
would be suspended until the sensed temperature re-
turned to an acceptable range.
Battery-Controlled Charging
Because of the programming arrangement of the LTC4010,
it may be possible to configure it for battery-controlled
charging. In this case, the battery pack is designed to pro-
vide customized information to an LTC4010-based charger,
allowing a single design to service a wide range of appli-
cation batteries. Assume the charger is designed to provide
a maximum charge current of 800mA (RSENSE = 125m).
Figure 10 shows a 4-cell NiCd battery pack for which 800mA
represents a 0.75C rate. When connected to the charger,
this pack would provide battery temperature information
and correctly configure both fast charge termination param-
eters and time limits for the internal NiCd cells.
APPLICATIO S I FOR ATIO
WU
UU
A second possibility is to configure an LTC4010-based
charger to accept battery packs with varying numbers of
cells. By including R2 of the average cell voltage divider
network shown in Figure 3, battery-based programming
of the number of series-stacked cells could be realized
without defeating LTC4010 detection of battery insertion
or removal. Figure 11 shows a 2-cell NiMH battery pack
that programs the correct number of series cells when it
is connected to the charger, along with indicating chem-
istry and providing temperature information.
Any of these battery pack charge control concepts could
be combined in a variety of ways to service custom
application needs.
Figure 10. NiCd Battery Pack with Time Limit Control
5
1200mAhr
NiCd CELLS
BATTERY
PACK
VTEMP
3
CHEM
8
TIMER
NC
66.5k
4010 F10
+
–
10k
NTC
Figure 11. NiMH Battery Pack Indicating Number of Cells
5
1500mAhr
NiMH CELLS
BATTERY
PACK
VTEMP
6
VCELL
R2
3
CHEM
4010 F11
+
–
10k
NTC
PCB Layout Considerations
To prevent magnetic and electrical field radiation and high
frequency resonant problems, proper layout of the com-
ponents connected to the LTC4010 is essential. Refer to
Figure 12. For maximum efficiency, the switch node rise
and fall times should be minimized. The following PCB
design priority list will help ensure proper topology. Lay-
out the PCB using this specific order.
相關(guān)PDF資料 |
PDF描述 |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LTC4010CFETR | 制造商:LINER 制造商全稱:Linear Technology 功能描述:High Efficiency Standalone Nickel Battery Charger |
| LTC4010CFETRPBF | 制造商:LINER 制造商全稱:Linear Technology 功能描述:High Efficiency Standalone Nickel Battery Charger |
| LTC4010EFE | 制造商:LINEAR 制造商全稱:LINEAR 功能描述:High Efficiency Standalone Nickel Battery Charger |
| LTC4011 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:High Efficiency Standalone Nickel Battery Charger |
| LTC4011_1 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:High Efficiency Standalone Nickel Battery Charger |
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