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參數(shù)資料
| 型號(hào)： | LTC3206EUF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 顯示驅(qū)動(dòng)器 |
| 英文描述： | I2C Multidisplay LED Controller |
| 中文描述： | LED DISPLAY DRIVER, BCC24 |
| 封裝： | 4 X 4 MM, 0.75 MM HEIGHT, PLASTIC, QFN-24 |
| 文件頁(yè)數(shù)： | 13/16頁(yè) |
| 文件大小： | 204K |
| 代理商： | LTC3206EUF |
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LTC3206
13
3206f
APPLICATIU
W
U
U
Table 4 shows a list of ceramic capacitor manufacturers
and how to contact them:
Table 4. Recommended Capacitor Vendors
AVX
Kemet
Murata
Taiyo Yuden
Vishay
www.avxcorp.com
www.kemet.com
www.murata.com
www.t-yuden.com
www.vishay.com
For very light load applications, the flying capacitors
may be reduced to save space or cost. The theoretical
minimum output resistance of a 1.5x fractional charge
pump is given by:
R
V
V
I
f
OL MIN
(
IN
OUT
OUT
OSC FLY
)
.
–
≡
=
1 5
1
2
where f
OSC
is the switching frequency (960kHz typ) and
C
FLY
is the value of the flying capacitors. Note that the
charge pump will typically be weaker than the theoretical
limit due to additional switch resistance, however for very
light load applications, the above expression can be used
as a guideline in determining a starting capacitor value.
Layout Considerations and Noise
Due to its high switching frequency and the transient
currents produced by the LTC3206, 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. Figure 7 shows the recom-
mended layout configuration.
The flying capacitor pins C1
+
, C2
+
, C1
–
and C2
–
will have
very high edge rate waveforms. The large dv/dt on these pins
can couple energy capacitively to adjacent printed circuit
board runs. Magnetic fields can also be generated if the
flying capacitors are not close to the LTC3206 (i.e., the loop
area is large). To decouple capacitive energy transfer, a
Faraday shield may be used. This is a grounded PC trace
between the sensitive node and the LTC3206 pins. For a high
quality AC ground, it should be returned to a solid ground
plane that extends all the way to the LTC3206.
Figure 7. Optimum Single Layer PCB Layout
GND
V
IN
CPO
3206 F07
PIN 1
Power Efficiency
To calculate the power efficiency (
η
) of a white LED driver
chip, the LED power should be compared to the input
power. The difference between these two number repre-
sents lost power whether it is in the charge pump or the
current sources. Stated mathematically, the power effi-
ciency is given by:
η≡
P
P
LED
IN
The efficiency of the LTC3206 depends upon the mode in
which it is operating. Recall that the LTC3206 operates as
a pass switch, connecting V
IN
to CPO until one of the LEDs
drops out. This feature provides the optimum efficiency
available for a given input voltage and LED forward volt-
age. When it is operating as a switch, the efficiency is
approximated by:
η≡
=
P
P
V
I
I
V
V
V
LED
IN
LED
LED
IN
IN
LED
IN
since the input current will be very close to the LED
current.
At moderate to high output power, the quiescent current
of the LTC3206 is negligible and the expression above is
valid. For example, with V
IN
= 3.9V, I
OUT
= 20mA 6 LEDs
and V
LED
equal to 3.6V, the measured efficiency is 92.2%,
which is very close to the theoretical 92.3% calculation.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LTC3206EUF#PBF | 功能描述:IC LED DRVR WT/RGB BCKLGT 24-QFN RoHS:是 類別:集成電路 (IC) >> PMIC - LED 驅(qū)動(dòng)器 系列:- 標(biāo)準(zhǔn)包裝:6,000 系列:- 恒定電流:- 恒定電壓:- 拓?fù)?開(kāi)路漏極，PWM 輸出數(shù):4 內(nèi)部驅(qū)動(dòng)器:是 類型 - 主要:LED 閃爍器 類型 - 次要:- 頻率:400kHz 電源電壓:2.3 V ~ 5.5 V 輸出電壓:- 安裝類型:表面貼裝 封裝/外殼:8-VFDFN 裸露焊盤(pán) 供應(yīng)商設(shè)備封裝:8-HVSON 包裝:帶卷 (TR) 工作溫度:-40°C ~ 85°C 其它名稱:935286881118PCA9553TK/02-TPCA9553TK/02-T-ND |
| LTC3206EUF#TR | 功能描述:IC LED DRVR WT/RGB BCKLGT 24-QFN RoHS:否 類別:集成電路 (IC) >> PMIC - LED 驅(qū)動(dòng)器 系列:- 標(biāo)準(zhǔn)包裝:6,000 系列:- 恒定電流:- 恒定電壓:- 拓?fù)?開(kāi)路漏極，PWM 輸出數(shù):4 內(nèi)部驅(qū)動(dòng)器:是 類型 - 主要:LED 閃爍器 類型 - 次要:- 頻率:400kHz 電源電壓:2.3 V ~ 5.5 V 輸出電壓:- 安裝類型:表面貼裝 封裝/外殼:8-VFDFN 裸露焊盤(pán) 供應(yīng)商設(shè)備封裝:8-HVSON 包裝:帶卷 (TR) 工作溫度:-40°C ~ 85°C 其它名稱:935286881118PCA9553TK/02-TPCA9553TK/02-T-ND |
| LTC3206EUF#TRPBF | 功能描述:IC LED DRVR WT/RGB BCKLGT 24-QFN RoHS:是 類別:集成電路 (IC) >> PMIC - LED 驅(qū)動(dòng)器 系列:- 標(biāo)準(zhǔn)包裝:6,000 系列:- 恒定電流:- 恒定電壓:- 拓?fù)?開(kāi)路漏極，PWM 輸出數(shù):4 內(nèi)部驅(qū)動(dòng)器:是 類型 - 主要:LED 閃爍器 類型 - 次要:- 頻率:400kHz 電源電壓:2.3 V ~ 5.5 V 輸出電壓:- 安裝類型:表面貼裝 封裝/外殼:8-VFDFN 裸露焊盤(pán) 供應(yīng)商設(shè)備封裝:8-HVSON 包裝:帶卷 (TR) 工作溫度:-40°C ~ 85°C 其它名稱:935286881118PCA9553TK/02-TPCA9553TK/02-T-ND |
| LTC3207 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:600mA Universal Multi-Output LED/CAM Driver |
| LTC3207-1 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:600mA Universal Multi-Output LED/CAM Driver |
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