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| 型号： | LT1513IR#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 10/16页 |
| 文件大小： | 0K |
| 描述： | IC BATT CHRGR CONST/PROG I/V 7DD |
| 标准包装： | 50 |
| 功能： | 充电管理 |
| 电池化学： | 所有电池类型 |
| 电源电压： | 2.7 V ~ 25 V |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | TO-263-8，D²Pak（7 引线+接片），TO-263CA |
| 供应商设备封装： | D2PAK-7 |
| 包装： | 管件 |
| 产品目录页面： | 1340 (CN2011-ZH PDF) |
LT1513/LT1513-2
APPLICATIO N S I N FOR M ATIO N
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:
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.
I CHARGE =
( V ISET )( R 4 / R 5 ) – I FBVOS
R 3
Voltage Mode Loop Stability
The LT1513 operates in constant-voltage mode during the
final phase of charging lithium-ion and lead-acid batteries.
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
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
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-
R5
LT1513-2
I FB
R4
L1B
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
I SET
249k
10k
C4
0.1 μ F
R3
0.2 ?
1513 F05
Figure 5
MODULATOR SECTION
g m = P =
V1
I
V1
4(V IN )
V IN + V BAT
I P
C P **
3pF
R P **
1M
V IN = DC INPUT VOLTAGE
V BAT = DC BATTERY VOLTAGE
FB
R1*
71.5k
C1
C1
R CAP
≈ 0.15 ?
R BAT
0.1 ?
V C
EA
+
+
EACH
C1
22 μ F
BATTERY
R5
330 ?
C5
0.1 μ F
R G
330k
g m
1500 μ mho
1.245V
R2
12.5k
EACH
1513 F06
* 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 P AND C P 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
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.
TRANSCONDUCTANCE WHOSE GAIN IS A FUNCTION OF INPUT AND
BATTERY VOLTAGE AS SHOWN.
Figure 6. Constant-Voltage Small-Signal Model
sn1513 1513fas
10
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LT1513IT7 | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Battery Management |
| LT1513IT7-2 | 制造商:LINER 制造商全称:Linear Technology 功能描述:SEPIC Constant- or Programmable-Current/ Constant-Voltage Battery Charger |
| 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 |
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