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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)： | 7/24頁 |
| 文件大?。?/td> | 212K |
| 代理商： | LTC4010CFE#PBF |
15
LTC4010
4010fa
APPLICATIO S I FOR ATIO
WU
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External DC Source
The external DC power source should be connected to the
charging system and the VCC pin through a power diode
acting as an input rectifier. This prevents catastrophic
system damage in the event of an input short to ground or
reverse-voltage polarity at the DC input. The LTC4010
automatically senses when this input drives the VCC pin
above BAT. The open-circuit voltage of the DC source
should be between 5.5V and 34V, depending on the
number of cells being charged. In order to avoid low
dropout operation, ensure 100% capacity at charge termi-
nation, and allow reliable detection of battery insertion,
removal or overvoltage, the following equation can be
used to determine the minimum full-load voltage that
should be produced at VCC when the external DC power
source is connected.
VCC(MIN) = (n 2V) + 0.3V
where n is the number of series cells in the battery pack.
The LTC4010 will properly charge over a wide range of VCC
and BAT voltage combinations. Operating the LTC4010 in
low dropout or with VCC much greater than BAT will force
the PWM frequency to be much less than 550kHz. The
LTC4010 disables charging and sets a fault if a large VCC
to BAT differential would cause generation of audible noise.
Load Control
Proper load current control is an important consideration
when fast charging nickel cells. This control ensures that
the system load remains powered at all times, but that
normal system operation and associated load transients
do not adversely affect fast charge termination. The input
protecton detailed in the previous paragraph is an integral
part of the necessary load control.
The battery should also be connected to the raw system
supply by some rectifying means, thus forming a switch that
selects the battery for system power only if an external DC
source is not present.
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:
R
mV
I
SENSE
PROG
=
100
RSENSE is an external resistor connected between the
SENSE and BAT pins. A 1% resistor with a low temperature
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
TIMER
MAX
=
()
–
30 10 6
Some typical timing values are detailed in Table 3. RTIMER
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.
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| LTC4011 | 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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