參數(shù)資料
型號(hào)： LT1513CT7-2
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(yè)數(shù)： 10/16頁(yè)
文件大?。?/td> 299K
代理商： LT1513CT7-2
10
LT1513/LT1513-2
APPLICATIO
S I
FOR
ATIO
U
Programmed Charging Current
LT1513-2 charging current can be programmed with a DC
voltage source or equivalent PWM signal, as shown in
Figure 5. In constant-current mode, I
FB
acts as a virtual
ground. The I
SET
voltage across R5 is balanced by the
voltage across R4 in the ratio R4/R5.
Charging current is given by:
W
U
U
I
V
R
R
3
I
R
CHARGE
ISET
FBVOS
=
(
)(
/
)–
4
5
I
FB
input current is small and can normally be ignored, but
I
FB
offset voltage must be considered if operating over a
wide range of program currents. The voltage across R3 at
maximum charge current can be increased to reduce
offset errors at lower charge currents. In Figure 5, I
SET
from 0V to 5V corresponds to an I
CHARGE
of 0A to 1A
+37/–62mA. C4 and R4 smooth the switch current wave-
form. During constant-current operation, the voltage feed-
back network loads the FB pin, which is held at V
REF
by the
I
FB
amplifier. It is recommended that this load does not
exceed 60
μ
A to maintain a sharp constant voltage to
constant current crossover characteristic. I
CHARGE
can
also be controlled by a PWM input. Assuming the signal is
a CMOS rail-to-rail output with a source impedance of less
than a few hundred ohms, effective I
SET
is V
CC
multiplied
by the PWM ratio. I
CHARGE
has good linearity over the
entire 0% to 100% range.
Voltage Mode Loop Stability
The LT1513 operates in constant-voltage mode during the
final phase of charging lithium-ion and lead-acid batteries.
This feedback loop is stabilized with a series resistor and
capacitor on the V
C
pin of the chip. Figure 6 shows the
simplified model for the voltage loop. The error amplifier is
modeled as a transconductance stage with g
m
= 1500
μ
mho
Figure 6. Constant-Voltage Small-Signal Model
–
+
R
P
**
1M
g
m
1500
μ
mho
I
P
MODULATOR SECTION
P
V1
V
IN
+ V
BAT
g
m
= I
V
IN
= DC INPUT VOLTAGE
V
BAT
= DC BATTERY VOLTAGE
4(V
IN
)
V1
FB
V
C
R1*
71.5k
R
≈
0.15
EACH
C1
22
μ
F
EACH
R
BAT
0.1
C1
C1
BATTERY
1513 F06
R2
12.5k
1.245V
EA
R
330k
R5
330
C5
0.1
μ
F
* FOR 8.4V BATTERY. ADJUST VALUE OF R1 FOR ACTUAL BATTERY VOLTAGE
** R
P
AND C
P
MODEL PHASE DELAY IN THE MODULATOR
THIS IS A SIMPLIFIED AC MODEL FOR THE LT1513 IN CONSTANT-
VOLTAGE MODE. RESISTOR AND CAPACITOR NUMBERS
CORRESPOND TO THOSE USED IN FIGURE 1. R
AND C
MODEL
THE PHASE DELAY IN THE MODULATOR. C3 IS 3pF FOR A 10
μ
H
INDUCTOR. IT SHOULD BE SCALED PROPORTIONALLY FOR OTHER
INDUCTOR VALUES (6pF FOR 20
μ
H). THE MODULATOR IS A
TRANSCONDUCTANCE WHOSE GAIN IS A FUNCTION OF INPUT AND
BATTERY VOLTAGE AS SHOWN.
C
P
**
3pF
+
+
AS SHOWN, THIS LOOP HAS A UNITY-GAIN FREQUENCY OF
ABOUT 250Hz. UNITY-GAIN WILL MOVE OUT TO SEVERAL
KILOHERTZ IF BATTERY RESISTANCE INCREASES TO SEVERAL
OHMS. R5 IS NOT USED IN ALL APPLICATIONS, BUT IT GIVES
BETTER PHASE MARGIN IN CONSTANT-VOLTAGE MODE WITH
HIGH BATTERY RESISTANCE.
Figure 5
C4
0.1
μ
F
R3
0.2
1513 F05
L1B
I
SET
R5
249k
R4
10k
I
FB
LT1513-2
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LT1513I 制造商:LINER 制造商全稱:Linear Technology 功能描述:SEPIC Constant- or Programmable-Current/ Constant-Voltage Battery Charger
LT1513IR 功能描述:IC BATT CHRGR CONST/PROG I/V 7DD 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)
LT1513IR#PBF 功能描述:IC BATT CHRGR CONST/PROG I/V 7DD 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(biāo)準(zhǔn)包裝:4,000 系列:- 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:2.7 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
LT1513IR#TR 功能描述:IC CHARGER BATTERY CONST V/I 7DD 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)
LT1513IR#TRPBF 功能描述:IC BATT CHRGR CONST/PROG I/V 7DD 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)
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