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参数资料
| 型号： | DC1621A |
| 厂商： | Linear Technology |
| 文件页数： | 13/24页 |
| 文件大小： | 0K |
| 描述： | BOARD DEMO LTM8062 |
| 设计资源： | DC1621A Design Files |
| 标准包装： | 1 |
| 系列： | LTM®, uModule® |
| 主要目的： | 电源管理，电池充电器 |
| 嵌入式： | 否 |
| 已用 IC / 零件： | LTM8062 |
| 主要属性： | 2 芯锂离子电池 / 锂聚合物，7.2V 2A 输出 |
| 次要属性： | 9.75V ~ 32V 输入 |
| 已供物品： | 板 |
| 相关产品： | LTM8062EV#PBF-ND - IC BATTERY CHARGER TRACK 77-LGA LTM8062IV#PBF-ND - IC BATTERY CHARGER TRACK 77-LGA |
LTM8062/LTM8062A
APPLICATIONS INFORMATION
? 100V MP ( 25°C ) ?
? k?
R IN = ?
? 1–
V INREG ? R SET
? TC ? 4405 V INREG
V MP ( 25°C )
TC ? 4405 ? V INREG ?
? 1 0.0677
? k ? ? 4.12k ?
– 100 ?
? k? ? 1400k?
R IN = ?
V +
R IN
V – V IN
efficient implementation of various temperature compensa-
tion schemes for a maximum peak power tracking (MPPT)
application. As the temperature characteristic for a typical
solar panel V MP voltage is highly linear, a simple solution
for tracking that characteristic can be implemented using a
Linear Technology LM234 3-terminal temperature sensor.
This creates an easily programmable, linear temperature
dependent characteristic.
In the circuit shown in Figure 4,
? – 100 ?
? V INREG ?
10 0000 ? 0.0677 ?
? ?
? ?
? 1 0.0677
R SET = 100 ? + –
?
? k?
where TC = temperature coefficient (in V/°C), and
V MP (25°C) = maximum power voltage at 25°C.
V IN
LINEAR
TECHNOLOGY
LM234
R
R SET
V INREG
LTM8062
8062 F04
Figure 4. MPPT Temperature Compensation Network
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 )
= –78mV/°C
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 temperature
compensation network in Figure 4. Initially, determine the
R SET value using the following equation:
?
R SET = 100 + –
? –78mV/°C ? 4405 2.7
17.6 ?
–78mV / °C ? 4405 ? 2.7 ?
Then, R IN can be determined using the calculated R SET
value:
? 100 ? 17.6V ?
? 2.7
? 1– 100000 ? 0.0677 ?
? 2.7 ? 4120 ?
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 accomplished by
incorporating a Linear Technology 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 tem-
perature coefficient, or –19.8mV/°C. Using the feedback
8062fd
For more information www.linear.com/LTM8062
13
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