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參數(shù)資料
| 型號： | 4060EFE |
| 廠商： | Linear Integrated Systems |
| 英文描述： | Standalone Linear NiMH/NiCd Fast Battery Charger |
| 中文描述： | 獨立線性鎳氫/鎳鎘電池快速充電器 |
| 文件頁數(shù)： | 4/20頁 |
| 文件大?。?/td> | 195K |
| 代理商： | 4060EFE |
12
LTC4060
4060f
Table 2. LTC4060 Charging Parameters
STATE
CHEM
CHARGE TIME LIMIT
TMIN
TMAX
ICHRG
TYPICAL TERMINATION CONDITION
Precharge
Both
tMAX
5°C45°CIMAX/5
VCELL ≥ 0.9V
Fast Charge
NiCd
tMAX
5°C55°CIMAX
–16mV Per Cell After Initial tMAX/12 Delay
NiMH
tMAX
5°C55°CIMAX
–8mV Per Cell After Initial tMAX/12 Delay
Battery Chemistry Selection
The desired battery chemistry is selected by programming
the CHEM pin to the proper voltage. When wired to GND,
a set of parameters specific to charging NiMH cells is
selected. When CHEM is connected to VCC, charging is
optimized for NiCd cells. The various charging parameters
are detailed in Table 2.
Cell Selection
The number of series cells is selected using the SEL0 and
SEL1 pins. For one cell, both pins connect to GND. For two
cells, SEL0 connects to VCC and SEL1 to GND. For three
cells, SEL0 connects to GND and SEL1 to VCC. For four
cells, both connect to VCC.
Insertion and Removal of Batteries
The LTC4060 automatically senses the insertion or re-
moval of a battery by monitoring the VCELL pin voltage.
Either the charge current, or if not charging then an
internal pull-up current (IBRD), will pull VCELL up when the
battery is removed. When this voltage rises above 2.05V
(VBR) for a time greater than the battery removal event
delay shown in Table 1, the LTC4060 considers the battery
to be absent. Inserting a battery, causing VCELL to fall
below both VBR and 1.95V (VBOV) for a period longer than
the battery insertion event delay shown in Table 1, results
in the LTC4060 recognizing a battery present and initiates
a completely new charge cycle beginning with charge
qualification. All battery currents are inhibited while in
shutdown.
OPERATIO
U
APPLICATIO S I FOR ATIO
WU
UU
Programming Charge Current
The battery charge current is set with an external program
resistor connected from the PROG pin to GND. The for-
mula for the battery fast charge current or IMAX is:
II
V
R
or
R
I
MAX
PROG
MAX
=
()
=
=
.
930
15
930
1395
where RPROG is the total resistance from the PROG pin to
ground. For example, if 1A of fast charge current is
required:
R
A
k
PROG ==
1395
1
14
.
1% Resistor
Under precharge conditions, the current is reduced to
20% of the fast charge value (IMAX).The LTC4060 is
designed for a maximum current of 2A. This translates to
a maximum PROG pin current of 2.15mA and a minimum
program resistor of 698. Reduced accuracy at low
current limits the useful fast charge current to a minimum
of approximately 200mA. Errors in the charge current can
be statistically approximated as follows:
One Sigma Error 7mA
For best stability over temperature and time, 1% metal-
film resistors are recommended. Capacitance on the PROG
pin should be limited to about 75pF to insure adequate AC
phase margin for its amplifier.
Different charge currents can be programmed by various
means such as by switching in different program resis-
tors. A voltage DAC connected through a resistor to the
PROG pin or a current DAC connected in parallel with a
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