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参数资料
| 型号： | DC1568A |
| 厂商： | Linear Technology |
| 文件页数： | 17/26页 |
| 文件大小： | 0K |
| 描述： | BOARD BATTERY CHARGER SOLAR PWR |
| 视频文件： | Linear Technology LT3652 |
| 设计资源： | DC1568A Design Files DC1568A Schematic |
| 特色产品： | Energy Harvesting Power Products |
| 标准包装： | 1 |
| 主要目的： | 电源管理，电池充电器 |
| 嵌入式： | 否 |
| 已用 IC / 零件： | LT3652 |
| 主要属性： | 多种化学，太阳能 |
| 次要属性： | LED 状态指示器 |
| 已供物品： | 板 |
| 相关产品： | LT3652HVIMSE#TRPBF-ND - IC BATTERY CHARGER 2A 12-MSOP LT3652HVIMSE#PBF-ND - IC BATTERY CHARGER 2A 12-MSOP LT3652HVIDD#TRPBF-ND - IC BATTERY CHARGER 2A 12-DFN LT3652HVIDD#PBF-ND - IC BATTERY CHARGER 2A 12-DFN LT3652HVEMSE#TRPBF-ND - IC BATTERY CHARGER 2A 12-MSOP LT3652HVEDD#TRPBF-ND - IC BATTERY CHARGER 2A 12-DFN LT3652HVEDD#PBF-ND - IC BATTERY CHARGER 2A 12-DFN LT3652HVEMSE#PBF-ND - IC BATTERY CHARGER 2A 12-MSOP LT3652IMSE#TRPBF-ND - IC BATT CHARGER SOLAR 2A 12MSOP LT3652IMSE#PBF-ND - IC BATT CHARGER SOLAR 2A 12MSOP 更多... |
LT3652
APPLICATIONS INFORMATION
simple solution for tracking that characteristic can be
implemented using an LM234 3-terminal temperature
sensor. This creates an easily programmable, linear
temperature dependent characteristic.
In the circuit shown in figure 8,
As the temperature coefficient for V MP is similar to that
of V OC , the specified temperature coefficient for V OC
(TC) of –78mV/°C and the specified peak power voltage
(V MP(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 R SET equal
to 1000Ω, then:
V IN
R IN1
V +
V –
LM234
R
R SET
V IN
V IN_REG
R SET = 1k
R IN1 = –1k ? (–0.078 ? 4405 ) = 344k
R IN2 = 344k/({[17.6 + 344k ? (0.0674/1k)]/2.7} – 1)
= 24.4k
R IN2
LT3652
Battery Voltage Temperature Compensation
3658 F08
Figure 8. MPPT Temperature Compensation Network
R IN1 = –R SET ? (TC ? 4405), and
R IN2 = R IN1 /({[V MP(25°C) + R IN1 ? (0.0674/R SET )]/V IN_REG } – 1)
Where: TC = temperature coefficient (in V/°C), and
V MP(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 (V OC ) = 21.7V
Maximum Power Voltage (V MP ) = 17.6V
Open-Circuit Voltage Temperature Coefficient (V OC ) =
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,
–78mV/°C
3652fd
17
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| DC1571B | 制造商:Aleph America Corporation 功能描述: |
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