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参数资料
| 型号： | LTC4009IUF#TRPBF |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 稳压器 |
| 英文描述： | BATTERY CHARGE CONTROLLER, 633 kHz SWITCHING FREQ-MAX, PQCC20 |
| 封装： | 4 X 4 MM, 0.75 MM HEIGHT, LEAD FREE, PLASTIC, MO-220WGGD-1, QFN-20 |
| 文件页数： | 13/28页 |
| 文件大小： | 351K |
| 代理商： | LTC4009IUF#TRPBF |
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LTC4009
LTC4009-1/LTC4009-2
0
4009fd
Input and Output Capacitors
In addition to typical input supply bypassing (0.1F) on
DCIN, the relatively high ESR of aluminum electrolytic
capacitors is helpful for reducing ringing when hot plug-
gingthechargertotheACadapter.RefertoLTCApplication
Note 88 for more information.
The input capacitor between system power (drain of top
FET, Figure 1) and GND is required to absorb all input PWM
ripplecurrent,thereforeitmusthaveadequateripplecurrent
rating. Maximum RMS ripple current is typically one-half
of the average battery charge current. Actual capacitance
value is not critical, but using the highest possible voltage
rating on PWM input capacitors will minimize problems.
Consult with the manufacturer before use.
Theoutputcapacitorshownacrossthebatteryandground
must also absorb PWM output ripple current. The general
formula for this capacitor current is:
I
V
L f
RMS
BAT
CLP
PWM
=
0 29
1
.
–
For example, IRMS = 0.22A with:
VBAT = 12.6V
VCLP = 19V
L1 = 10H
fPWM = 550kHz
High capacity ceramic capacitors (20F or more) available
from a variety of manufacturers can be used for input/out-
put capacitors. Other alternatives include OS-CON and
POSCAP capacitors from Sanyo.
Low ESR solid tantalum capacitors have high ripple cur-
rent rating in a relatively small surface mount package,
but exercise caution when using tantalum for input or
output bulk capacitors. High input surge current can be
created when the adapter is hot-plugged to the charger
or when a battery is connected to the charger. Solid tan-
talum capacitors have a known failure mechanism when
subjected to very high surge currents. Select tantalum
capacitors that have high surge current ratings or have
been surge tested.
EMI considerations usually make it desirable to minimize
ripple current in battery leads. Adding Ferrite beads or
inductors can increase battery impedance at the nominal
550KHzswitchingfrequency.Switchingripplecurrentsplits
between the battery and the output capacitor in inverse
relation to capacitor ESR and the battery impedance. If
the ESR of the output capacitor is 0.2
Ω and the battery
impedance is raised to 4
Ω with a ferrite bead, only 5% of
the current ripple will flow to the battery.
Inductor Selection
Higher switching frequency generally results in lower
efficiency because of MOSFET gate charge losses, but it
allows smaller inductor and capacitor values to be used.
A primary effect of the inductor value L1 is the amplitude
of ripple current created. The inductor ripple current
IL
decreases with higher inductance and PWM operating
frequency:
I
V
L f
L
BAT
CLP
PWM
=
–
1
Accepting larger values of
IL allows the use of low in-
ductance, but results in higher output voltage ripple and
greater core losses. Lower charge currents generally call
for larger inductor values.
applicaTions inForMaTion
相关PDF资料 |
PDF描述 |
|---|---|
| LTC4009IUF#PBF | BATTERY CHARGE CONTROLLER, 633 kHz SWITCHING FREQ-MAX, PQCC20 |
| LTC4009CUF-1#TRPBF | BATTERY CHARGE CONTROLLER, 633 kHz SWITCHING FREQ-MAX, PQCC20 |
| LTC4009CUF-2#TRPBF | BATTERY CHARGE CONTROLLER, 633 kHz SWITCHING FREQ-MAX, PQCC20 |
| LTC4009IUF-1#PBF | BATTERY CHARGE CONTROLLER, 633 kHz SWITCHING FREQ-MAX, PQCC20 |
| LTC4009CUF-2#PBF | BATTERY CHARGE CONTROLLER, 633 kHz SWITCHING FREQ-MAX, PQCC20 |
相关代理商/技术参数 |
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| LTC4010 | 制造商:LINEAR 制造商全称:LINEAR 功能描述:High Efficiency Standalone Nickel Battery Charger |
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| LTC4010CFE#TRPBF | 功能描述:IC CHARGER NIMH/NICD 16-TSSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 电池管理 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- 功能:电池监控器 电池化学:碱性，锂离子，镍镉，镍金属氢化物 电源电压:1 V ~ 5.5 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:SOT-23-6 供应商设备封装:SOT-6 包装:带卷 (TR) |
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