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参数资料
| 型号： | DC1568A |
| 厂商： | Linear Technology |
| 文件页数： | 16/26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
cleaning measures should be implemented to prevent
board contamination, and low-leakage solder flux is
recommended.
Input Supply Voltage Regulation
The LT3652 contains a voltage monitor pin that enables
programming a minimum operational voltage. Connect-
ing a resistor divider from V IN to the V IN_REG pin enables
programming of minimum input supply voltage, typically
used to program the peak power voltage for a solar panel.
Maximum charge current is reduced when the V IN_REG pin
is below the regulation threshold of 2.7V.
If an input supply cannot provide enough power to satisfy
the requirements of an LT3652 charger, the supply voltage
will collapse. A minimum operating supply voltage can
thus be programmed by monitoring the supply through
a resistor divider, such that the desired minimum volt-
age corresponds to 2.7V at the V IN_REG pin. The LT3652
servos the maximum output charge current to maintain
the voltage on V IN_REG at or above 2.7V.
Programming of the desired minimum voltage is ac-
complished by connecting a resistor divider as shown in
MPPT Temperature Compensation
A typical solar panel is comprised of a number of series-con-
nected cells, each cell being a forward-biased p-n junction.
As such, the open-circuit voltage (V OC ) of a solar cell has
a temperature coefficient that is similar to a common p-n
diode, or about –2mV/°C. The peak power point voltage
(V MP ) for a crystalline solar panel can be approximated as
a fixed voltage below V OC , so the temperature coefficient
for the peak power point is similar to that of V OC .
Panel manufacturers typically specify the 25°C values for
V OC , V MP , and the temperature coefficient for V OC , making
determination of the temperature coefficient for V MP of a
typical panel straight forward.
The LT3652 employs a feedback network to program the
V IN input regulation voltage. Manipulation of the network
makes for efficient implementation of various temperature
compensation schemes for a maximum peak power track-
ing (MPPT) application. As the temperature characteristic
for a typical solar panel V MP voltage is highly linear, a
Figure 6. The ratio of R IN1 /R IN2 for a desired minimum
voltage (V IN(MIN) ) is:
R IN1 /R IN2 = (V IN(MIN) /2.7) – 1
If the voltage regulation feature is not used, connect the
V IN_REG pin to V IN .
V OC(25°C)
V MP(25°C)
V MP
V OC TEMP CO.
V OC
V OC – V MP
5
15
25
35
45
55
TEMPERATURE (°C)
INPUT
SUPPLY
R IN1
R IN2
V IN
LT3652
V IN_REG
3652 F06
3652 F07
Figure 7. Temperature Characteristics for Solar Panel
Output Voltage
Figure 6. Resistor Divider Sets Minimum V IN
3652fd
16
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