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參數(shù)資料
| 型號： | LTM8062EV#PBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | BATTERY CHARGE CONTROLLER, 1150 kHz SWITCHING FREQ-MAX, PBGA77 |
| 封裝： | 15 X 9 MM, 4.32 MM HEIGHT, ROHS COMPLIANT, MO-222, LGA-77 |
| 文件頁數(shù)： | 6/24頁 |
| 文件大小： | 580K |
| 代理商： | LTM8062EV#PBF |
LTM8062/LTM8062A
14
8062fa
APPLICATIONS INFORMATION
Figure 5. Lead-Acid 6-Cell Float Charge Voltage vs Temperature
with a –19.8mV/°C Temperature Coefficient Using LM234 with
the Feedback Network
network shown in Figure 5, with the desired temperature
coefficient (TC) and 25°C float voltage (VFLOAT (25°C))
specified, and using a convenient value of 2.4k for RSET,
necessary resistor values follow the relations:
RFB1 = –RSET (TC 4405)
= –2.4k (–0.0198 4405)
210kΩ
RFB2 =
RFB1
VFLOAT(25°C)+RFB1(0.0674/RSET)
VFB
1
=
210k
13.5
+210k (0.0674/ 2.4k)
3.3
1
43k
RFB3 = 250k – RFB1||RFB2
= 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:
VFLOAT = 4 10–5 (T2) – 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.
Figure 6. Thermistor-Based Temperature Compensation Network
Programs VFLOAT to Closely Match Ideal Lead-Acid Float Charge
Voltage for 6-Cell Charger
TEMPERATURE (°C)
–10
V FLOAT
(V)
10
50
40
60
0
20
30
8062 F05b
12.6
12.8
13.0
13.2
13.4
13.6
13.8
14.0
14.2
14.3
–19.8mV/°C
TEMPERATURE (°C)
–10
V FLOAT
(V)
10
50
40
60
0
20
30
8062 F06b
12.8
13.0
13.2
13.4
13.6
13.8
14.0
14.6
14.4
14.2
14.8
THEORETICAL VFLOAT
PROGRAMMED VBAT(FLOAT)
8062 F06a
LTM8062
196k
69k
22k
B = 3380
69k
BAT
ADJ
198k
6-CELL
LEAD-ACID
BATTERY
+
8062 F05a
LTM8062
LINEAR
TECHNOLOGY
LM234
RFB1
210k
RFB2
43k
V+
V–
R
RSET
2.4k
BAT
ADJ
RFB3
215k
6-CELL
LEAD-ACID
BATTERY
+
Status Pins
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 VIN, 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
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