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參數(shù)資料
| 型號： | LT1510-5 |
| 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)： | 11/16頁 |
| 文件大?。?/td> | 339K |
| 代理商： | LT1510-5 |
11
LT1510/LT1510-5
APPLICATIO
S I
N
FOR
ATIO
U
of the battery, canceling part or all of the 200
μ
A. Note that
if net current is into the battery and the battery is removed,
the charger output voltage will float high, to near input
voltage. This could be a problem when reinserting the
battery, if the resulting output capacitor/battery surge
current is high enough to damage either the battery or the
capacitor.
If net current into the battery must be less than zero in
shutdown, there are several options. Increasing divider
current to 300
μ
A - 400
μ
A will ensure that net battery
current is less than zero. For long term storage conditions
however, the divider may need to be disconnected with a
MOSFET switch as shown in Figures 2 and 5. A second
option is to connect a 1N914 diode in series with the
MOSFET drain. This will limit how far the V
C
pin will be pulled
down, and current (
≈
700
μ
A) will flow into he BAT pin, and
therefore out of the battery. This is not usually a problem
unless the charger will remain in the shutdown state with
input power applied for very long periods of time.
Removing input power to the charger will cause the BAT
pin current to drop to near zero, with only the divider
current remaining as a small drain on the battery. Even
that current can be eliminated with a switch as shown in
Figures 2 and 5.
W
U
period, after which the LT1510 can be shut down by
pulling the V
C
pin low with an open collector or drain.
Some external means must be used to detect the need for
additional charging if needed, or the charger may be
turned on periodically to complete a short float-voltage
cycle.
Current trip level is determined by the battery voltage, R1
through R3, and the internal LT1510 sense resistor
(
≈
0.18
pin-to-pin). D2 generates hysteresis in the trip
level to avoid multiple comparator transitions.
Nickel-Cadmium and Nickel-Metal-Hydride Charging
The circuit in Figure 6 uses the 8-pin LT1510 to charge
NiCd or NiMH batteries up to 12V with charging currents
of 0.5A when Q1 is on and 50mA when Q1 is off.
Figure 5. Disconnecting Voltage Divider
Some battery manufacturers recommend termination of
constant-voltage float mode after charging current has
dropped below a specified level (typically 50mA to 100mA)
anda further time-out period of 30 minutes to 90 minutes
has elapsed. This may extend the life of the battery, so
check with manufacturers for details. The circuit in Figure
7 will detect when charging current has dropped below
75mA. This logic signal is used to initiate a time-out
Figure 6. Charging NiMH or NiCd Batteries
(Efficiency at 0.5A
≈
90%)
For a 2-level charger, R1 and R2 are found from:
=
(
I
R
BAT
PROG
)(
)(
)
2000 2 465
.
R
I
R
I
I
LOW
HI
LOW
1
2 465 2000
.
2
2465 2000
=
(
)
=
(
)
All battery chargers with fast-charge rates require some
means to detect full charge state in the battery to terminate
the high charging current. NiCd batteries are typically
charged at high current until temperature rise or battery
R3
12k
R4
4.99k
0.25%
R5
220k
OVP
V
IN
+
–
+
–
4.2V
4.2V
V
BAT
Q3
VN2222
LT1510
1510 F05
SW
BOOST
GND
SENSE
V
CC
PROG
V
C
BAT
R2
11k
+
R1
100k
Q1
VN2222
*TOKIN OR MARCON CERAMIC
SURFACE MOUNT
**COILTRONICS CTX33-2
WALL
ADAPTER
1510 F05.5
C1
0.22
μ
F
C
IN
*
10
μ
F
L1**
33
μ
H
LT1510
D1
1N5819
D3
1N5819
D2
1N914
+
C
OUT
22
F
TANT
0.1
μ
F
+
1k
1
μ
F
300
2V TO
20V
I
BAT
ON: I
BAT
= 0.5A
OFF: I
BAT
= 0.05A
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參數(shù)描述 |
|---|---|
| LT-1510-510-012 | 制造商:Carling Technologies 功能描述:LT-SERIES TOGGLE SWITCH - Bulk |
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| LT1510-5CGN | 功能描述:IC BATT CHARGER CONST V/I 16SSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 電池管理 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:2,500 系列:- 功能:電池監(jiān)控器 電池化學(xué):堿性，鋰離子，鎳鎘，鎳金屬氫化物 電源電壓:1 V ~ 5.5 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:SOT-23-6 供應(yīng)商設(shè)備封裝:SOT-6 包裝:帶卷 (TR) |
| LT1510-5CGN#PBF | 功能描述:IC BATT CHARGER CONST V/I 16SSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 電池管理 系列:- 其它有關(guān)文件:STC3100 View All Specifications 特色產(chǎn)品:STC3100 - Battery Monitor IC 標準包裝:4,000 系列:- 功能:燃料，電量檢測計/監(jiān)控器 電池化學(xué):鋰離子（Li-Ion） 電源電壓:2.7 V ~ 5.5 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:8-TSSOP，8-MSOP（0.118"，3.00mm 寬） 供應(yīng)商設(shè)備封裝:8-MiniSO 包裝:帶卷 (TR) 其它名稱:497-10526-2 |
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