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参数资料
| 型号： | DC1621A |
| 厂商： | Linear Technology |
| 文件页数： | 14/24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
R FB2 =
V FLOAT (25°C)+R FB1 ? (0.0674 /R SET )
V FB
=
-1
198k
network shown in Figure 5, with the desired temperature
coefficient (TC) and 25°C float voltage (V FLOAT (25°C))
specified, and using a convenient value of 2.4k for R SET ,
necessary resistor values follow the relations:
R FB1 = –R SET ? (TC ? 4405)
= –2.4k ? (–0.0198 ? 4405) ? 210kΩ
R FB1
-1
210k
13.5+210k ? (0.0674 / 2.4k)
3.3
? 43k?
R FB3 = 250k – R FB1 ||R FB2
= 250k – 210k||43k ? 215kΩ
(see the Battery Float Voltage Programming section)
While the circuit in Figure 5 creates a linear tempera-
ture characteristic that follows a typical –3.3mV/°C per
cell lead-acid specification, the theoretical float charge
voltage characteristic is slightly nonlinear. This nonlinear
characteristic follows the relation:
V FLOAT = 4 ? 10 –5 (T 2 ) – 6 ? 10 –3 (T) + 2.375
(with a 2.18V minimum)
where T = temperature in °C. A thermistor-based network
can be used to approximate the nonlinear ideal tempera-
ture characteristic across a reasonable operating range,
as shown in Figure 6.
BAT
196k 6-CELL +
LEAD-ACID
LTM8062 BATTERY
69k 22k
B = 3380
ADJ
69k
8062 F06a
BAT
LTM8062
ADJ
R FB3
215k
R FB1
210k
R SET
2.4k
R
V + LINEAR
TECHNOLOGY
V – LM234
+
6-CELL
LEAD-ACID
BATTERY
14.8
14.6
14.4
14.2
R FB2
43k
8062 F05a
14.0
13.8
THEORETICAL V FLOAT
13.6
14.3
13.4
14.2
14.0
13.2
13.0
PROGRAMMED V BAT(FLOAT)
13.8
–19.8mV/°C
12.8
–10
0
10
20
30
40
50
60
13.6
13.4
TEMPERATURE (°C)
8062 F06b
13.2
13.0
12.8
Figure 6. Thermistor-Based Temperature Compensation Network
Programs V FLOAT to Closely Match Ideal Lead-Acid Float Charge
Voltage for 6-Cell Charger
12.6
–10
0
10
20
30
40
50
60
Status Pins
TEMPERATURE (°C)
8062 F05b
Figure 5. Lead-Acid 6-Cell Float Charge Voltage vs Temperature
with a –19.8mV/°C Temperature Coefficient Using LM234 with
the Feedback Network
The LTM8062/LTM8062A report charger status through
two open-collector outputs, the CHRG and FAULT pins.
These pins can be pulled up as high as V IN , and can sink
up to 10mA. The CHRG pin indicates that the charger is
delivering current at greater than a C/10 rate, or one-tenth
8062fd
14
For more information www.linear.com/LTM8062
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