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參數(shù)資料
| 型號： | LT1512 |
| 廠商： | Linear Technology Corporation |
| 英文描述： | SEPIC (Single-Ended Primary Inductance Converter) Constant-Current/ Constant-Voltage Battery Charger(初級線圈感應轉換，恒定電流/恒定電壓電池充電器) |
| 中文描述： | SEPIC拓撲（單端初級電感轉換器）恒流/恒壓電池充電器（初級線圈感應轉換，恒定電流/恒定電壓電池充電器） |
| 文件頁數(shù)： | 7/12頁 |
| 文件大?。?/td> | 229K |
| 代理商： | LT1512 |
7
LT1512
APPLICATIO
S I
FOR
ATIO
U
W
U
U
LT1512
V
IN
L1 A
L1 B
GND
FB
1512 F03
V
SW
SHUTDOWN
D2
1N4148
CONNECT D2 ANODE HERE IF FULLY CHARGED
BATTERY VOLTAGE IS GREATER THAN 3.5V AND
Q1 MUST BE TURNED OFF IN SHUTDOWN WITH
V
IN
STILL ACTIVE
CONNECT D2 ANODE HERE FOR FULLY
CHARGED BATTERY VOLTAGE LESS
THAN 3.5V. Q1 WILL NOT BE TURNED OFF
IN SHUTDOWN IF V
IN
IS PRESENT
S/S
C2
C6
470pF
R1
R5
470k
R2
R3
Q1
2N7002
+
D1
Figure 3. Eliminating Divider Current
Maximum Input Voltage
Maximum input voltage for the circuit in Figure 1 is partly
determined by battery voltage. A SEPIC converter has a
maximum switch voltage equal to input voltage plus output
voltage. The LT1512 has a maximum input voltage of 30V
and a maximum switch voltage of 40V, so this limits
maximum input voltage to 30V, or 40V – V
BAT
, whichever
is less. Maximum V
BAT
= 40V – V
IN
.
Shutdown and Synchronization
The dual function S/S pin provides easy shutdown and
synchronization. It is logic level compatible and can be
pulled high or left floating for normal operation. A logic low
on the S/S pin activates shutdown, reducing input supply
current to 12
μ
A. To synchronize switching, drive the S/S pin
between 600kHz and 800kHz.
Inductor Selection
L1A and L1B are normally just two identical windings on one
core, although two separate inductors can be used. A typical
value is 33
μ
H, which gives about 0.25A peak-to-peak induc-
tor current. Lower values will give higher ripple current,
which reduces maximum charging current. 15
μ
H can be
used if charging currents are at least 20% lower than the
values shown in the maximum charging current graph.
Higher inductance values give slightly higher maximum
charging current, but are larger and more expensive. A low
loss toroid core such as KoolM
μ
, Molypermalloy or Metglas
is recommended. Series resistance should be less than
0.1
for each winding. “Open core” inductors, such as rods
or barrels are not recommended because they generate
large magnetic fields which may interfere with other elec-
tronics close to the charger.
Input Capacitor
The SEPIC topology has relatively low input ripple current
compared to other topologies and higher harmonics are
especially low. RMS ripple current in the input capacitor is
less than 0.1A with L = 33
μ
H and less than 0.2A with
L = 15
μ
H. A low ESR 22
μ
F, 25V solid tantalum capacitor
(AVX type TPS or Sprague type 593D) is adequate for most
applications with the following caveat. Solid tantalum ca-
pacitors can be destroyed with a very high turn-on surge
current such as would be generated if a low impedance input
source were “hot switched” to the charger input. If this
condition can occur, the input capacitor should have the
highest possible voltage rating, at least twice the surge input
voltage if possible. Consult with the capacitor manufacturer
before a final choice is made. A 2.2
μ
F ceramic capacitor such
as the one used for the coupling capacitor can also be used.
These capacitors do not have a turn-on surge limitation. The
input capacitor must be connected directly to the V
IN
pin and
the ground plane close to the LT1512.
KoolM
μ
is a registered trademark of Magnetics, Inc.
Metglas is a registered trademark of AlliedSignal Inc.
相關PDF資料 |
PDF描述 |
|---|---|
| LT1513-2 | SEPIC Constant- or Programmable-Current/ Constant-Voltage Battery Charger |
| LT1513CR-2 | SEPIC Constant- or Programmable-Current/ Constant-Voltage Battery Charger |
| LT1513IR-2 | SEPIC Constant- or Programmable-Current/ Constant-Voltage Battery Charger |
| LT1513C | SEPIC Constant- or Programmable-Current/ Constant-Voltage Battery Charger |
| LT1513CR | SEPIC Constant- or Programmable-Current/ Constant-Voltage Battery Charger |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| LT1512C | 制造商:LINER 制造商全稱:Linear Technology 功能描述:SEPIC Constant-Current/ Constant-Voltage Battery Charger |
| LT1512CGN | 功能描述:IC BATT CHRGR CONST I/V 16-SSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 電池管理 系列:- 標準包裝:2,000 系列:Impedance Track™ 功能:燃料，電量檢測計/監(jiān)控器 電池化學: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） 供應商設備封裝:20-TSSOP 包裝:帶卷 (TR) 產品目錄頁面:1020 (CN2011-ZH PDF) 配用:BQ27350EVM-ND - BQ27350EVM 其它名稱:296-21665-2 |
| LT1512CGN#PBF | 功能描述:IC BATT CHRGR CONST I/V 16-SSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 電池管理 系列:- 標準包裝:1 系列:- 功能:充電管理 電池化學:鋰離子（Li-Ion）、鋰聚合物（Li-Pol） 電源電壓:3.75 V ~ 6 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:SC-74A，SOT-753 供應商設備封裝:SOT-23-5 包裝:剪切帶 (CT) 產品目錄頁面:669 (CN2011-ZH PDF) 其它名稱:MCP73831T-2ACI/OTCT |
| LT1512CGN#TR | 功能描述:IC CHARGER BATT CONST V/I 16SSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 電池管理 系列:- 產品培訓模塊: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: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 供應商設備封裝:SOT-6 包裝:帶卷 (TR) |
| LT1512CGN#TRPBF | 功能描述:IC BATT CHRGR CONST I/V 16-SSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 電池管理 系列:- 標準包裝:1 系列:- 功能:充電管理 電池化學:鋰離子（Li-Ion）、鋰聚合物（Li-Pol） 電源電壓:3.75 V ~ 6 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:SC-74A，SOT-753 供應商設備封裝:SOT-23-5 包裝:剪切帶 (CT) 產品目錄頁面:669 (CN2011-ZH PDF) 其它名稱:MCP73831T-2ACI/OTCT |
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