- 您现在的位置：买卖IC网 > PDF目录80295 > LTC4012IUF-2#TRPBF (LINEAR TECHNOLOGY CORP) SWITCHING CONTROLLER, 633 kHz SWITCHING FREQ-MAX, PQCC20 PDF资料下载
参数资料
| 型号： | LTC4012IUF-2#TRPBF |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHING 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： | 10/28页 |
| 文件大小： | 381K |
| 代理商： | LTC4012IUF-2#TRPBF |
第1页第2页第3页第4页第5页第6页第7页第8页第9页当前第10页第11页第12页第13页第14页第15页第16页第17页第18页第19页第20页第21页第22页第23页第24页第25页第26页第27页第28页
LTC4012/
LTC4012-1/LTC4012-2
4012fa
applications inForMation
Programming LTC4012-1/LTC4012-2 Output Voltage
The LTC4012-1/LTC4012-2 feature precision internal bat-
teryvoltagefeedbackresistortapsconfiguredforcommon
lithium-ion voltages. All that is required to program the
desired voltage is proper pin programming of FVS0 and
FVS1 as shown in Table 3.
Table 3. LTC4012-1/LTC4012-2 Output Voltage Programming
VBAT VOLTAGE
LTC4012-1
LTC4012-2
FVS1
FVS0
4.1V
4.2V
GND
8.2V
8.4V
GND
INTVDD
12.3V
12.6V
INTVDD
GND
16.4V
16.8V
INTVDD
Programming Input Current Limit
To set the input current limit ILIM, the minimum wall
adapter current rating must be known. To account for the
tolerance of the LTC4012 input current sense circuit, 5%
should be subtracted from the adapter’s minimum rated
output. Refer to Figure 6 and program the input current
limit function with the following equation.
R
mV
I
CL
LIM
=
100
where ILIM is the desired maximum current draw from
theDC(adapter)input,includingadjustmentsfortolerance,
if any.
Figure 6. Programming Input Current Limit
2
1
RCL
CDC
CF 0.1F
CLP
LTC4012
CLN
RF
5.1k
4012 F06
10k
FROM DC
POWER
INPUT
TO
REMAINDER
OF SYSTEM
3 INFET
2
1
CLP
CLN
17
INTVDD
LTC4012
RCL
1%
R3 = R1
1%
R1
1%
Q2
2SC2412
RF
2.49k 1%
R2
Q1
IMX1
4012 F07
CF
0.22F
TO REMAINDER
OF SYSTEM
FROM INFET
Figure 7. Adjusting Input Current Limit
Often an AC adapter will include a rated current output
margin of at least +10%. This can allow the adapter cur-
rent limit value to simply be programmed to the actual
minimum rated adapter output current. Table 4 shows
some common RCL current limit programming values.
A lowpass filter formed by RF (5.1k) and CF (0.1F) is
required to eliminate switching noise from the LTC4012
PWM and other system components. If input current limit-
ing is not desired, CLN should be shorted to CLP while
CLP remains connected to power.
Table 4. Common RCL Values
ADAPTER
RATING
(A)
RCL VALUE (1%)
(Ω)
RCL POWER
DISSIPATION
(W)
RCL POWER
RATING
(W)
1.00
0.100
0.25
1.25
0.080
0.125
0.25
1.50
0.068
0.150
0.25
1.75
0.056
0.175
0.25
2.00
0.050
0.200
0.25
2.50
0.039
0.244
0.50
3.00
0.033
0.297
0.50
3.50
0.027
0.331
0.50
4.00
0.025
0.400
0.50
Figure 7 shows an optional circuit that can influence
the parameters of the input current limit in two ways.
相关PDF资料 |
PDF描述 |
|---|---|
| LTC3611EWP#TR | 10 A SWITCHING REGULATOR, 1000 kHz SWITCHING FREQ-MAX, PQCC64 |
| LT3509EMSE#PBF | 1.2 A DUAL SWITCHING CONTROLLER, 2500 kHz SWITCHING FREQ-MAX, PDSO16 |
| LQN-1.5/50-D12MB-C | DC-DC REG PWR SUPPLY MODULE |
| LKP5740-7ERD6TB1 | 2-OUTPUT 250 W AC-DC PWR FACTOR CORR MODULE |
| LS1501-9ERD7TB1 | 1-OUTPUT 100 W AC-DC REG PWR SUPPLY MODULE |
相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC4012IUF-3#PBF | 功能描述:IC BATT CHRGR MC HI-EFF 20-QFN 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) |
| LTC4012IUF-3#TRPBF | 功能描述:IC CTLR BATT CHARGER CC/CV 20QFN 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) |
| LTC4012IUF-3-PBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:High Efficiency, Multi-Chemistry Battery Charger with PowerPath Control |
| LTC4012IUF-3-TRPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:High Efficiency, Multi-Chemistry Battery Charger with PowerPath Control |
| LTC4020EUHF#PBF | 制造商:Linear Technology 功能描述:Battery Charger Lead-Acid/Li-FePO4/Li-Ion/Li-Pol 20000mA 55V 38-Pin QFN EP 制造商:Linear Technology 功能描述:IC BATT CHARGER 55V BB 38QFN 制造商:Linear Technology 功能描述:BATTERY CHARGER, 20A, QFN-38 制造商:Linear Technology 功能描述:BATTERY CHARGER, 20A, QFN-38, Input Voltage:55V, Battery Charge Voltage:55V, Charge Current Max:20A, Battery IC Case Style:QFN, No. of Pins:38, No. of Series Cells:12, Operating Temperature Min:-40C, Operating Temperature Max:125C , RoHS Compliant: Yes |
发布紧急采购，3分钟左右您将得到回复。