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參數(shù)資料
| 型號： | LTC4011EFE#PBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 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 |
| 文件頁數(shù)： | 7/24頁 |
| 文件大小： | 228K |
| 代理商： | LTC4011EFE#PBF |
15
LTC4011
4011p
APPLICATIO S I FOR ATIO
WU
UU
R
RT
R
RT
T
R
RR
R R T
RR T
if R
k
OO
O
OO
O
1
1 164
2
0 141
2
3
11 46 2
1 2
1
2
12
10
=
()
=
()
+
=
++
()
+
()
<
.–
–
.
.–
,
β
β R1
Figure 4. Single-Cell Monitor Network
12
9
BAT
10k
33nF
1 CELL
4011 F04
VCDIV
8
VCELL
The filter formed by R4 and C1 in Figure 5 is optional but
recommended for rejecting PWM switching noise. Alter-
natively, R4 may be replaced by a short, and a value
chosen for C1 which will provide adequate filtering from
the Thevenin impedance of the remaining thermistor net-
work. The filter pole frequency, which should be less than
500Hz, will vary more with battery temperature without
R4. External components should be chosen to make the
Thevenin impedance from VTEMP to GND 100k or less,
including R4, if present.
Figure 5. External NTC Thermistor Network
6
7
VRT
R1
R2
RT
R4
51k
R3
C1
10nF
4011 F05
VTEMP
Thermistor Network Design
The network for proper temperature sensing using a
thermistor with a negative temperature coefficient (NTC)
is shown in Figure 5. R3 is only required for thermistors
with a room temperature value above 10k. For thermistors
with a room temperature value of 10k or less, replace R3
with a short.
The LTC4011 is designed to work best with a 1% 10k NTC
thermistor with a β of 3750. In this case, the values for the
external network are given by:
R1 = 10.7k
R2 = 30.9k
R3 = 0
However, the LTC4011 will operate with other NTC ther-
mistors having different nominal values or exponential
temperature coefficients. For these thermistors, the gen-
eral-purpose design equations for the passive resistors in
the external linearization network are as follows:
where:
RO = Thermistor (RT) value at TO ()
TO = Thermistor reference temperature (°K)
β = Thermistor exponential temperature coefficient of
resistance
Disabling Thermistor Functions
Temperature sensing is optional in LTC4011 applications.
For low cost systems where temperature sensing may not
be required, the VTEMP pin may simply be wired to VRT to
disable temperature qualification of all charging opera-
tions. However, this practice is not recommended for
NiMH cells charged well above or below their 1C rate,
because fast charge termination based solely on voltage
inflection may not be adequate to protect the battery from
a severe overcharge. A resistor between 10k and 20k may
be used to connect VTEMP to VRT if the pause function is
still desired.
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