參數(shù)資料
型號(hào)： LT3652HVEDD#PBF
廠商： LINEAR TECHNOLOGY CORP
元件分類： 穩(wěn)壓器
英文描述： BATTERY CHARGE CONTROLLER, PDSO12
封裝： 3 X 3 MM, LEAD FREE, PLASTIC, DFN-12
文件頁(yè)數(shù)： 8/24頁(yè)
文件大?。?/td> 250K
代理商： LT3652HVEDD#PBF
LT3652HV
16
3652hvf
power tracking (MPPT) application. As the temperature
characteristic for a typical solar panel VMP voltage is highly
linear, a simple solution for tracking that characteristic can
be implemented using an LM234 3-terminal temperature
sensor. This creates an easily programmable, linear tem-
perature dependent characteristic.
In the circuit shown in figure 8,
APPLICATIONS INFORMATION
Battery Voltage Temperature Compensation
Some battery chemistries have charge voltage require-
ments that vary with temperature. Lead-acid batteries in
particular experience a significant change in charge volt-
age requirements as temperature changes. For example,
manufacturers of large lead-acid batteries recommend
a float charge of 2.25V/cell at 25°C. This battery float
voltage, however, has a temperature coefficient which is
typically specified at –3.3mV/°C per cell.
In a manner similar to the MPPT temperature correction
outlined previously, implementation of linear battery
charge voltage temperature compensation can be ac-
complished by incorporating an LM234 into the output
feedback network.
For example, a 6-cell lead acid battery has a float charge
voltage that is commonly specified at 2.25V/cell at 25°C,
or 13.5V, and a –3.3mV/°C per cell temperature coefficient,
or –19.8mV/°C. Using the feedback network shown in
Figure 9, with the desired temperature coefficient (TC)
Figure 8. MPPT Temperature Compensation Network
VIN_REG
LT3652HV
VIN
LM234
3658 F08
V+
V–
R
RSET
RIN1
RIN2
RIN1 = –RSET (TC 4405), and
RIN2=RIN1/({[VMP(25°C) + RIN1 (0.0674/RSET)]/VIN_REG} – 1)
Where: TC = temperature coefficient (in V/°C), and
VMP(25°C) = maximum power voltage at 25°C
For example, given a common 36-cell solar panel that has
the following specified characteristics:
Open Circuit Voltage (VOC) = 21.7V
Maximum Power Voltage (VMP) = 17.6V
Open-Circuit Voltage Temperature Coefficient (VOC) =
–78mV/°C
As the temperature coefficient for VMP is similar to that
of VOC, the specified temperature coefficient for VOC
(TC) of –78mV/°C and the specified peak power voltage
(VMP(25°C)) of 17.6V can be inserted into the equations to
calculate the appropriate resistor values for the tempera-
ture compensation network in Figure 8. With RSET equal
to 1000Ω, then:
RSET = 1k
RIN1 = –1k (–0.078 4405 ) = 344k
RIN2 = 344k/({[17.6 + 344k (0.0674/1k)]/2.7} – 1)
= 24.4k
LT3652HV
RFB3
215k
RFB2
43k
RSET
2.4k
RFB1
210k
6-CELL
LEAD-ACID
BATTERY
LM234
3652 F09a
V+
V–
R
BAT
VFB
+
Figure 9. Lead-Acid 6-Cell Float Charge Voltage vs
Temperature Has –19.8mV/°C Characteristic Using LM234 with
Feedback Network
TEMPERATURE (°C)
–10
V
FLOAT
(V)
10
50
40
60
020
30
3652 F09b
12.6
12.8
13.0
13.2
13.4
13.6
13.8
14.0
14.2
14.3
–19.8mV/°C
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