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參數(shù)資料
| 型號： | LT1512IS8 |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SEPIC Constant-Current/ Constant-Voltage Battery Charger |
| 中文描述： | 2.7 A BATTERY CHARGE CONTROLLER, 580 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封裝： | 0.150 INCH, PLASTIC, SOP-8 |
| 文件頁數(shù)： | 8/12頁 |
| 文件大小： | 261K |
| 代理商： | LT1512IS8 |
8
LT1512
APPLICATIO
S I
FOR
ATIO
U
Output Capacitor
It is assumed as a worst case that all the switching output
ripple current from the battery charger could flow in the
output capacitor. This is a desirable situation if it is neces-
sary to have very low switching ripple current in the battery
itself. Ferrite beads or line chokes are often inserted in series
with the battery leads to eliminate high frequency currents
that could create EMI problems. This forces all the ripple
current into the output capacitor. Total RMS current into the
capacitor has a maximum value of about 0.5A, and this is
handled with a 22
μ
F, 25V capacitor shown in Figure 1. This is
an AVX type TPS or Sprague type 593D surface mount solid
tantalum unit intended for switching applications. Do not
substitute other types without ensuring that they have
adequate ripple current ratings. See Input Capacitor section
for details of surge limitation on solid tantalum capacitors if
the battery may be “hot switched” to the output of the
charger.
W
U
U
Coupling Capacitor
C2 in Figure 1 is the coupling capacitor that allows a SEPIC
converter topology to work with input voltages either higher
or lower than the battery voltage. DC bias on the capacitor is
equal to input voltage. RMS ripple current in the coupling
capacitor has a maximum value of about 0.5A at full charg-
ing current. A conservative formula to calculate this is:
I
V
V
(
2
(1.1 is a fudge factor to account for inductor ripple current
and other losses)
With I
CHRG
= 0.5A, V
IN
= 15V and V
BAT
= 8.2V, I
COUP
= 0.43A
The recommended capacitor is a 2.2
μ
F ceramic type from
Marcon or Tokin. These capacitors have extremely low ESR
and high ripple current ratings in a small package. Solid
tantalum units can be substituted if their ripple current rating
is adequate, but typical values will increase to 22
μ
F or more
to meet the ripple current requirements.
I
V
COUP RMS
CHRG
IN
BAT
)
IN
(
)
(
)( . )
1 1
=
+
Diode Selection
The switching diode should be a Schottky type to minimize
both forward and reverse recovery losses. Average diode
current is the same as output charging current , so this will
be under 1A. A 1A diode is recommended for most applica-
tions, although smaller devices could be used at reduced
1
2
3
4
C
F
I
F
S
V
S
G
G
V
I
R5
C4
R3
R4
S/S
1512 F04b
C5
R2
C1
D1
C2
C3
R1
V
BATT
+
+
+V
IN
GND
L1B
L1A
b. Single-Sided Altenative Layout
2 WINDING
INDUCTOR
L1A
1512 F04a
L1B
R4
R1
1
4
3
2
C4
R2
D1
V
IN
GND
GND
V
BATT
R3
C2A
C2B
C3
C5
C1
U1
R5
S/S
a. Double-Sided (Vias Connect to the Backside of Ground Plane.
Dash Lines Indicate Interconnects on Backside. Demo Board
Uses This Layout, Except that R5 Has Been Added to Increase
Phase Margin)
Figure 4. LT1512 Suggested Layouts for Critical Thermal and Electrical Paths
相關PDF資料 |
PDF描述 |
|---|---|
| LT1512 | 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) |
| 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 |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| LT1512IS8#PBF | 功能描述:IC BATT CHRGR CONST I/V 8-SOIC RoHS:是 類別:集成電路 (IC) >> PMIC - 電池管理 系列:- 其它有關文件: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: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） 供應商設備封裝:8-MiniSO 包裝:帶卷 (TR) 其它名稱:497-10526-2 |
| LT1512IS8#TR | 功能描述:IC CHARGER BATT CONST V/I 8SOIC RoHS:否 類別:集成電路 (IC) >> PMIC - 電池管理 系列:- 產(chǎn)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) |
| LT1512IS8#TRPBF | 功能描述:IC BATT CHRGR CONST I/V 8-SOIC RoHS:是 類別:集成電路 (IC) >> PMIC - 電池管理 系列:- 產(chǎn)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) |
| LT1513 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:SEPIC Constant- or Programmable-Current/ Constant-Voltage Battery Charger |
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