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參數(shù)資料
| 型號(hào)： | LT1511CSW |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | Octal Bus Transceivers 20-SOIC 0 to 70 |
| 中文描述： | 4 A BATTERY CHARGE CONTROLLER, 230 kHz SWITCHING FREQ-MAX, PDSO24 |
| 封裝： | 0.300 INCH, PLASTIC, SOP-24 |
| 文件頁(yè)數(shù)： | 12/16頁(yè) |
| 文件大?。?/td> | 145K |
| 代理商： | LT1511CSW |
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12
LT1511
For 2A full current, the current sense resistor (R
S1
) should
be increased to 0.05
so that enough signal (10mV) will
be across R
S1
at 0.2A trickle charge to keep charging
current accurate.
For a 2-level charger, R1 and R2 are found from;
R1
2.465 4000
I
LOW
R2
2.465 4000
I
I
HI
LOW
=
(
)
=
(
)
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
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. Please contact the Linear Technology
Applications Department about charge termination cir-
cuits.
If overvoltage protection is needed, R3 and R4 should be
calculated according to the procedure described in Lithium-
Ion Charging section. The OVP pin should be grounded if
not used.
When a microprocessor DAC output is used to control
charging current, it must be capable of sinking current at a
compliance up to 2.5V if connected directly to the PROG pin.
Thermal Calculations
If the LT1511 is used for charging currents above 1.5A, 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 and switch transition losses. The SO wide package,
with a thermal resistance of 30
°
C/W, can provide a full 3A
charging current in many situations. A graph is shown in
the Typical Performance Characteristics section.
NEGATIVE EDGE
TO TIMER
1511 F04
3.3V OR 5V
ADAPTER
OUTPUT
3
8
7
1
4
2
D1
1N4148
C1
0.1
μ
F
BAT
SENSE
R1*
1.6k
R
S1
0.033
R4
470k
R3
430k
R2
560k
LT1011
+
D2
1N4148
* TRIP CURRENT =
=
≈
400mA
R1(V
BAT
)
(R2 + R3)(R
S1
)
(1.6k)(8.4V)
(560k + 430k)(0.033
)
–
V
BAT
BAT
R
S3
200
R
S2
200
LT1511
I
BAT
R2
5.49k
R1
49.3k
1k
PROG
0.33
μ
F
Q1
LT1511
1511 F05
Nickel-Cadmium and Nickel-Metal-Hydride Charging
The circuit in the 3A Lithium Battery Charger (Figure 1) can
be modified to charge NiCd or NiMH batteries. For ex-
ample, 2-level charging is needed; 2A when Q1 is on and
200mA when Q1 is off.
Figure 6. 2-Level Charging
APPLICATIO
S I
FOR
ATIO
U
W
U
U
Figure 5. Current Comparator for Initiating Float Time Out
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LT1511 | Constant-Current/ Constant-Voltage 3A Battery Charger with Input Current Limiting |
| LT1511ISW | Constant-Current/ Constant-Voltage 3A Battery Charger with Input Current Limiting |
| LT1512CS8 | CAP 220PF 250VAC CERAMIC Y2/X1 |
| LT1512CN8 | SEPIC Constant-Current/ Constant-Voltage Battery Charger |
| LT1512C | Octal Bus Transceivers 20-PDIP 0 to 70 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LT1511CSW#PBF | 功能描述:IC BATT CHRGR CONST I/V 3A24SOIC RoHS:是 類別:集成電路 (IC) >> PMIC - 電池管理 系列:- 標(biāo)準(zhǔn)包裝:2,000 系列:Impedance Track™ 功能:燃料，電量檢測(cè)計(jì)/監(jiān)控器 電池化學(xué):鋰離子（Li-Ion） 電源電壓:2.4 V ~ 2.6 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:20-TSSOP（0.173"，4.40mm 寬） 供應(yīng)商設(shè)備封裝:20-TSSOP 包裝:帶卷 (TR) 產(chǎn)品目錄頁(yè)面:1020 (CN2011-ZH PDF) 配用:BQ27350EVM-ND - BQ27350EVM 其它名稱:296-21665-2 |
| LT1511CSW#TR | 功能描述:IC CHARGER BATT CONST V/I 24SOIC 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(biāo)準(zhǔn)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) |
| LT1511CSW#TRPBF | 功能描述:IC BATT CHRGR CONST I/V 3A24SOIC RoHS:是 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(biāo)準(zhǔn)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) |
| LT1511CSWPBF | 制造商:Linear Technology 功能描述:LT1511CSWPBF |
| LT1511ISW | 功能描述:IC BATT CHRGR CONST I/V 3A24SOIC 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(biāo)準(zhǔn)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) |
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