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參數(shù)資料
| 型號： | LT1513IT7-2 |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SEPIC Constant- or Programmable-Current/ Constant-Voltage Battery Charger |
| 中文描述： | 5.4 A BATTERY CHARGE CONTROLLER, 580 kHz SWITCHING FREQ-MAX, PSFM7 |
| 封裝： | PLASTIC, TO-220, 7 PIN |
| 文件頁數(shù)： | 13/16頁 |
| 文件大小： | 299K |
| 代理商： | LT1513IT7-2 |
13
LT1513/LT1513-2
TYPICAL APPLICATIO
N
S
Lithium-Ion Battery Charger with
Switchable Charge Current
Many battery chemistries require several constant-current
settings during the charging cycle. The circuit shown in
Figure 8 uses the LT1513-2 to provide switchable 1.35A and
0.13A constant-current modes. The circuit is based on a
standard SEPIC battery charger circuit set to a single
lithium-ion cell charge voltage of 4.1V. The LT1513-2 has I
FB
referenced to ground allowing a simple resistor network to
set the charging current values. In constant-current mode,
the I
FB
error amplifier drives the FB pin, increasing charging
current, until I
R4
is balanced by I
R5
.
I
I
R
I
R
CHARGE
R
FBVOS
=
(
)(
)–
4
5
3
There are several ways to control I
R5
including DAC, PWM or
resistor network as shown here. If the lithium cell requires
precharging, Q1 is turned on, setting a constant current of
0.13A. When charge voltage is reached, Q1 is turned off,
programming the full charge current of 1.35A. As the cell
voltage approaches 4.1V, the voltage sensing network (R1,
R2) starts driving the V
FB
pin, changing the LT1513-2 to
constant-voltage mode. As charging current falls, the output
remains in constant-voltage mode for the remainder of the
charging cycle. When charging is complete, the LT1513-2
can be shut down with the S/S pin.
LT1513-2
L1A
CTX10-4
L1B
GND
I
FB
1513 F08
V
SW
V
FB
1
7
6
3
5
2
V
C
V
IN
V
IN
S/S
R3
330
R5
36k
R4
4.7k
C5
0.1
μ
F
4
C4
0.22
μ
F
C2
4.7
μ
F
D1
MBRS330T3
C1
22
μ
F
25V
×
2
+
C3
25
μ
F
25V
R7
910
Q1
R6
10k
3.3V
R3
0.25
R1
78.7k
0.5%
Li-Ion
RECHARGABLE
CELL
GND
R2
34k
0.5%
+
CHARGE
SHUTDOWN
PRECHARGE
CHARGE
Figure 8. Lithium-Ion Battery Charger
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LT1513CT7-2 | SEPIC Constant- or Programmable-Current/ Constant-Voltage Battery Charger |
| LT1513 | SEPIC Constant- or Programmable-Current/ Constant-Voltage Battery Charger(初級線圈感應(yīng)轉(zhuǎn)換，恒定電流或可編程電流/恒定電壓電池充電器) |
| LT1521-3 | Cap-Free, NMOS, 150mA Low Dropout Regulator with Reverse Current Protection |
| LT1521-3.3 | Paired Cable; Jacket Material:Polyvinylchloride (PVC); Leaded Process Compatible:Yes RoHS Compliant: Yes |
| LT1521IST-3.3 | Cap-Free, NMOS, 150mA Low Dropout Regulator with Reverse Current Protection |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LT-1514-110-006 | 制造商:Carling Technologies 功能描述:LT-SERIES TOGGLE SWITCH - Bulk |
| LT-1514-110-012 | 制造商:Carling Technologies 功能描述:SINGLE-POLE, LIGHTED TOGGLE, RED LENS - Bulk |
| LT-1514-110-024 | 制造商:Carling Technologies 功能描述:LT-SERIES TOGGLE SWITCH - Bulk |
| LT-1514-110-125 | 制造商:Carling Technologies 功能描述:LT-SERIES TOGGLE SWITCH - Bulk |
| LT-1514-112-012 | 制造商:Carling Technologies 功能描述:LT-SERIES TOGGLE SWITCH - Bulk |
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