參數(shù)資料
型號(hào)： LTC4011EFE#PBF
廠商： LINEAR TECHNOLOGY CORP
元件分類(lèi)： 穩(wěn)壓器
英文描述： BATTERY CHARGE CONTROLLER, 615 kHz SWITCHING FREQ-MAX, PDSO20
封裝： 4.40 MM, PLASTIC, TSSOP-20
文件頁(yè)數(shù)： 6/24頁(yè)
文件大?。?/td> 228K
代理商： LTC4011EFE#PBF
14
LTC4011
4011p
Cell Voltage Network Design
An external resistor network is required to provide the
average single-cell voltage to the VCELL pin of the LTC4011.
The proper circuit for multicell packs is shown in Figure 3.
The ratio of R2 to R1 should be a factor of (n – 1), where
n is the number of series cells in the battery pack. The value
of R1 should be between 1k and 100k. This range limits the
sensing error caused by VCELL leakage current and pre-
vents the ON resistance of the internal NFET between VCDIV
and GND from causing a significant error in the VCELL
voltage. The external resistor network is also used to
detect battery insertion and removal. The filter formed by
C1 and the parallel combination of R1 and R2 is recom-
mended for rejecting PWM switching noise. The value of
C1 should be chosen to yield a 1st order lowpass fre-
quency of less than 500Hz. In the case of a single cell, the
external application circuit shown in Figure 4 is recom-
mended to provide the necessary noise filtering and miss-
ing battery detection.
APPLICATIO S I FOR ATIO
WU
UU
Table 2. LTC4011 Charging Parameters
CHEM
BAT
STATE
PIN
CHEMISTRY
TIMER
TMIN
TMAX
ICHRG
TERMINATION CONDITION
PC
Both
tMAX/12
5°C45°CIPROG/5
Timer Expires
FC
Open
NiCd
tMAX
5°C60°CIPROG
–20mV per Cell or 2°C/Minute
GND
NiMH
tMAX
5°C60°CIPROG
1.5°C/Minute for First tMAX/12 Minutes if Initial
VCELL < 1.325V
–10mV per Cell or 1°C/Minute After tMAX/12 Minutes
or if Initial VCELL > 1.325V
TOC
GND
NiMH
tMAX/3
5°C60°CIPROG/10
Timer Expires
AR
Both
5°C45°C0
VCELL < 1.325V
PC: Precharge
FC: Fast Charge (Initial –V Termination Hold Off of tMAX/12 Minutes May Apply)
TOC: Top-Off Charge (Only for NiMH T/t FC Termination After Initial tMAX/12 Period)
AR: Automatic Recharge (Temperature Limits Apply to State Termination Only)
Table 3. LTC4011 Time Limit Programming Examples
FAST CHARGE
TOP-OFF
TYPICAL FAST
PRECHARGE LIMIT
VOLTAGE STABILIZATION
FAST CHARGE LIMIT
CHARGE
RTIMER
CHARGE RATE
(MINUTES)
(HOURS)
(MINUTES)
24.9k
2C
3.8
0.75
15
33.2k
1.5C
5
1
20
49.9k
1C
7.5
1.5
30
66.5k
0.75C
10
2
40
100k
C/2
15
3
60
12
9
BAT
LTC4011
R2
+
FOR TWO OR
MORE SERIES CELLS
R1
C1
R2 = R1(n – 1)
4011 F03
VCDIV
GND
8
5
VCELL
Figure 3. Mulitple Cell Voltage Divider
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