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參數(shù)資料
| 型號： | LTC4010EFE |
| 廠商： | Linear Integrated Systems |
| 英文描述： | High Efficiency Standalone Nickel Battery Charger |
| 中文描述： | 高效率的獨立鎳電池充電器 |
| 文件頁數(shù)： | 12/20頁 |
| 文件大小： | 205K |
| 代理商： | LTC4010EFE |
12
LTC4010
4010p
APPLICATIU
selects the battery for system power only if an external DC
source is not present.
W
U
U
Battery Chemistry Selection
The desired battery chemistry is selected by programming
the CHEM pin to the proper voltage. If it is wired to GND,
a set of parameters specific to charging NiMH cells is
selected. When CHEM is left floating, charging is opti-
mized for NiCd cells. The various charging parameters are
detailed in Table 2.
Programming Charge Current
Charge current is programmed using the following
equation:
mV
I
PROG
R
SENSE
is an external resistor connected between the
SENSE and BAT pins. A 1% resistor with a low temperature
R
SENSE
=
100
coefficient and sufficient power dissipation capability to
avoid self-heating effects is recommended.
Programming Maximum Charge Times
Connecting the appropriate resistor between the TIMER
pin and GND programs the maximum duration of various
charging states. To some degree, the value should reflect
how closely the programmed charge current matches the
1C rate of targeted battery packs. The maximum fast
charge period is determined by the following equation:
R
t
Hours
(
30 10
6
TIMER
MAX
=
( )
)
–
Some typical timing values are detailed in Table 3. R
TIMER
should not be less than 15k. The actual time limits used by
the LTC4010 have a resolution of approximately
±
30
seconds in addition to the tolerances given the Electrical
Characteristics table. The maximum time period is ap-
proximately 4.3 hours.
Table 2. LTC4010 Charging Parameters
CHEM
STATE
PIN
CHEMISTRY
PC
FC
Open
GND
BAT
TIMER
t
MAX
/12
t
MAX
t
MAX
T
MIN
5
°
C
5
°
C
5
°
C
T
MAX
45
°
C
60
°
C
60
°
C
I
CHRG
I
PROG
/5
I
PROG
I
PROG
TERMINATION CONDITION
Timer Expires
–20mV per Cell or 2
°
C/Minute
1.5
°
C/Minute for First t
MAX
/12 Minutes if Initial
V
CELL
< 1.325V
–10mV per Cell or 1
°
C/Minute After t
MAX
/12 Minutes
or if Initial V
CELL
> 1.325V
Timer Expires
V
CELL
< 1.325V
Both
NiCd
NiMH
TOC
AR
GND
NiMH
Both
t
MAX
/3
5
°
C
5
°
C
60
°
C
45
°
C
I
PROG
/10
0
PC: Precharge
FC:
Fast Charge (Initial –
V Termination Hold Off of t
MAX
/12 Minutes May Apply)
TOC: Top-Off Charge (Only for NiMH
T/
t FC Termination After Initial t
MAX
/12 Period)
AR: Automatic Recharge (Temperature Limits Apply to State Termination Only)
Table 3. LTC4010 Time Limit Programming Examples
FAST CHARGE
VOLTAGE STABILIZATION
(MINUTES)
3.8
5
7.5
10
15
TOP-OFF
CHARGE
(MINUTES)
15
20
30
40
60
TYPICAL FAST
CHARGE RATE
2C
1.5C
1C
0.75C
C/2
PRECHARGE LIMIT
(MINUTES)
3.8
5
7.5
10
15
FAST CHARGE LIMIT
(HOURS)
0.75
1
1.5
2
3
R
TIMER
24.9k
33.2k
49.9k
66.5k
100k
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