收藏本站
LTC3207/LTC3207-1
APPLICATIONS INFORMATION
Flying Capacitor Selection
Warning: Polarized capacitors, such as tantalum or
aluminum, should never be used for the ?ying capaci-
Table 1 shows a list of ceramic capacitor manufacturers
and how to contact them:
Table 1. Recommended Capacitor Vendors
tors since their voltage can reverse upon start-up of the
LTC3207/LTC3207-1. Ceramic capacitors should always
be used for the ?ying capacitors.
The ?ying capacitors control the strength of the charge
pump. In order to achieve the rated output current it is
AVX
Kemet
Murata
Taiyo Yuden
Vishay
www.avxcorp.com
www.kemet.com
www.murata.com
www.t-yuden.com
www.vishay.com
necessary to have at least 1.6μF of capacitance for each
of the ?ying capacitors. Capacitors of different materials
lose their capacitance with higher temperature and voltage
at different rates. For example, a ceramic capacitor made
of X7R material will retain most of its capacitance from
–40°C to 85°C whereas a Z5U or Y5V style capacitor will
lose considerable capacitance over that range. Z5U and Y5V
capacitors may also have a very poor voltage coef?cient
causing them to lose 60% or more of their capacitance when
the rated voltage is applied. Therefore, when comparing
different capacitors, it is often more appropriate to compare
the amount of achievable capacitance for a given case size
rather than comparing the speci?ed capacitance value. For
example, overrated voltage and temperature conditions,
a 1μF, 10V, Y5V ceramic capacitor in a 0603 case may not
provide any more capacitance than a 0.22μF, 10V, X7R
available in the same case. The capacitor manufacturer’s
data sheet should be consulted to determine what value
of capacitor is needed to ensure minimum capacitances
at all temperatures and voltages.
Layout Considerations and Noise
The LTC3207/LTC3207-1 have been designed to minimize
EMI. However due to the high switching frequency and the
transient currents produced by the LTC3207/LTC3207-1,
careful board layout is necessary. A true ground plane
and short connections to all capacitors will improve
performance and ensure proper regulation under all
conditions.
The ?ying capacitor pins, C1P, C2P, C1M and C2M,
will have 5ns to 10ns edge-rate waveforms. The large
dv/dt on these pins can couple energy capacitively to
adjacent PCB runs. Magnetic ?elds can also be gen-
erated if the ?ying capacitors are not close to the
LTC3207/LTC3207-1 (i.e., the loop area is large). To
decouple capacitive energy transfer, a Faraday shield may
be used. This is a grounded PCB trace between the sensitive
node and the LTC3207/LTC3207-1 pins. For a high quality
AC ground, it should be returned to a solid ground plane
that extends all the way to the LTC3207/LTC3207-1.
3207fc
16
发布紧急采购，3分钟左右您将得到回复。

采购需求

(若只采购一条型号，填写一行即可)

发布成功！您可以继续发布采购。也可以进入我的后台，查看报价

发布成功！您可以继续发布采购。也可以进入我的后台，查看报价

*型号 *数量 厂商 批号 封装
添加更多采购

我的联系方式

*
*
*
相关PDF资料
LTC3208EUH#TRPBF IC LED DRIVR QVGA DISPLAY 32-QFN
LTC3209EUF-2#TRPBF IC LED DRIVR QVGA DISPLAY 20-QFN
LTC3210EPD-1#TRPBF IC LED DRVR WHITE BCKLT 16-UTQFN
LTC3210EUD#TRPBF IC LED DRIVR WHITE BCKLGT 16-QFN
LTC3212EDDB#TRPBF IC LED DRIVER RGB 12-DFN
LTC3214EDD#TRPBF IC LED DRIVR WHITE BCKLGT 10-DFN
LTC3215EDD#PBF IC LED DRIVR WHITE BCKLGT 10-DFN
LTC3217EUD#TRPBF IC LED DRVR FLASH TORCH 16QFN
相关代理商/技术参数
LTC3207EUF-1-PBF 制造商:LINER 制造商全称:Linear Technology 功能描述:600mA Universal Multi-Output LED/CAM Driver
LTC3207EUF-1-TRPBF 制造商:LINER 制造商全称:Linear Technology 功能描述:600mA Universal Multi-Output LED/CAM Driver
LTC3207EUF-PBF 制造商:LINER 制造商全称:Linear Technology 功能描述:600mA Universal Multi-Output LED/CAM Driver
LTC3207EUF-TRPBF 制造商:LINER 制造商全称:Linear Technology 功能描述:600mA Universal Multi-Output LED/CAM Driver
LTC3208 制造商:LINER 制造商全称:Linear Technology 功能描述:High Current Software Confi gurable Multidisplay LED Controller
LTC3208EUH 制造商:LINER 制造商全称:Linear Technology 功能描述:High Current Software Confi gurable Multidisplay LED Controller
LTC3208EUH#PBF 功能描述:IC LED DRIVR QVGA DISPLAY 32-QFN RoHS:是 类别:集成电路 (IC) >> PMIC - LED 驱动器 系列:- 标准包装:6,000 系列:- 恒定电流:- 恒定电压:- 拓扑:开路漏极，PWM 输出数:4 内部驱动器:是 类型 - 主要:LED 闪烁器 类型 - 次要:- 频率:400kHz 电源电压:2.3 V ~ 5.5 V 输出电压:- 安装类型:表面贴装 封装/外壳:8-VFDFN 裸露焊盘 供应商设备封装:8-HVSON 包装:带卷 (TR) 工作温度:-40°C ~ 85°C 其它名称:935286881118PCA9553TK/02-TPCA9553TK/02-T-ND
LTC3208EUH#TRPBF 功能描述:IC LED DRIVR QVGA DISPLAY 32-QFN RoHS:是 类别:集成电路 (IC) >> PMIC - LED 驱动器 系列:- 标准包装:6,000 系列:- 恒定电流:- 恒定电压:- 拓扑:开路漏极，PWM 输出数:4 内部驱动器:是 类型 - 主要:LED 闪烁器 类型 - 次要:- 频率:400kHz 电源电压:2.3 V ~ 5.5 V 输出电压:- 安装类型:表面贴装 封装/外壳:8-VFDFN 裸露焊盘 供应商设备封装:8-HVSON 包装:带卷 (TR) 工作温度:-40°C ~ 85°C 其它名称:935286881118PCA9553TK/02-TPCA9553TK/02-T-ND