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參數(shù)資料
| 型號： | LT1510 |
| 廠商： | Linear Technology Corporation |
| 英文描述： | Constant-Voltage/ Constant-Current Battery Charger |
| 中文描述： | 恒壓/恒流充電器 |
| 文件頁數(shù)： | 12/16頁 |
| 文件大?。?/td> | 339K |
| 代理商： | LT1510 |
12
LT1510/LT1510-5
APPLICATIO
S I
FOR
ATIO
U
W
U
U
Figure 7. Current Comparator for Initiating Float Time-Out
0.18
GND
NEGATIVE EDGE
TO TIMER
INTERNAL
SENSE
RESISTOR
1510 F06
3.3V OR 5V
ADAPTER
OUTPUT
3
8
7
1
4
2
LT1510
D1
1N4148
C1
0.1
μ
F
BAT
SENSE
R1*
1.6k
R4
470k
R3
430k
R2
560k
LT1011
+
D2
1N4148
* TRIP CURRENT =
R1(V
BAT
)
(R2 + R3)(0.18
)
–
voltage decrease is detected as an indication of near full
charge. The charging current is then reduced to a much
lower value and maintained as a constant trickle charge.
An intermediate “top off” current may be used for a fixed
time period to reduce 100% charge time.
NiMH batteries are similar in chemistry to NiCd but have
two differences related to charging. First, the inflection
characteristic in battery voltage as full charge is ap-
proached is not nearly as pronounced. This makes it more
difficult to use dV/dt as an indicator of full charge, and
change of temperature is more often used with a tempera-
ture sensor in the battery pack. Secondly, constant trickle
charge may not be recommended. Instead, a moderate
level of current is used on a pulse basis (
≈
1% to 5% duty
cycle) with the time-averaged value substituting for a
constant low trickle.
Thermal Calculations
If the LT1510 is used for charging currents above 0.4A, a
thermal calculation should be done to ensure that junction
temperature will not exceed 125
°
C. Power dissipation in
the IC is caused by bias and driver current, switch resis-
tance, switch transition losses and the current sense
resistor. The following equations show that maximum
practical charging current for the 8-pin SO package
(125
°
C/W thermal resistance) is about 0.8A for an 8.4V
battery and 1.1A for a 4.2V battery. This assumes a 60
°
C
maximum ambient temperature. The 16-pin SO, with a
thermal resistance of 50
°
C/W, can provide a full 1.5A
charging current in many situations. The 16-pin PDIP falls
between these extremes. Graphs are shown in the Typical
Performance Characteristics section.
P
mA V
)
mA V
V
V
(
mA
I
P
I
V
V
V
P
I
R
V
V
t
V
I
f
P
BIAS
IN
BAT
BAT
IN
BAT
DRIVER
BAT
BAT
BAT
30
IN
SW
BAT
SW
BAT
IN
)(
OL
IN
BAT
SENSE
=
(
+
(
)( )
+
[
)(
(
)
+
(
)(
)
]
=
)
( )
+
=
(
) (
)(
)
+
( )( )(
)( )
=
3 5
1 5
7 5
0 012
1
55
0
2
2
2
.
18
2
(
)
I
BAT
R
SW
= Switch ON resistance
≈
0.35
t
OL
= Effective switch overlap time
≈
10ns
f = 200kHz (500kHz for LT1510-5)
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LT1510C | Constant-Voltage/ Constant-Current Battery Charger |
| LT1510I | Constant-Voltage/ Constant-Current Battery Charger |
| LT1510CN | Constant-Voltage/ Constant-Current Battery Charger |
| LT1510-5 | Constant-Voltage/ Constant-Current Battery Charger |
| LT1511CSW | Octal Bus Transceivers 20-SOIC 0 to 70 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LT-1510-101-012 | 制造商:Carling Technologies 功能描述:LT-SERIES TOGGLE SWITCH - Bulk |
| LT-1510-110-012 | 功能描述:TOGGLE SW 15A 125VAC SOLDER LUG RoHS:是 類別:開關(guān) >> 撥動開關(guān) 系列:LT 標(biāo)準(zhǔn)包裝:1 系列:A 電路:雙刀雙擲 開關(guān)功能:開-開-開 觸點(diǎn)額定電壓:6A @ 125VAC 觸動器類型:扁平型 觸動器長度:11.38mm 發(fā)光:不發(fā)光 安裝類型:面板安裝 端接類型:焊片 軸襯螺紋:1/4-40 包裝:散裝 |
| LT-1510-110-024 | 制造商:Carling Technologies 功能描述:LT-SERIES TOGGLE SWITCH - Bulk |
| LT-1510-110-125 | 制造商:Carling Technologies 功能描述:LT-SERIES TOGGLE SWITCH - Bulk |
| LT-1510-115-125 | 制造商:Carling Technologies 功能描述:LT-SERIES TOGGLE SWITCH - Bulk |
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