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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)： | 14/16頁(yè) |
| 文件大?。?/td> | 204K |
| 代理商： | LTC3206EUF |
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LTC3206
14
3206f
APPLICATIOU
Once an LED pin drops out, the LTC3206 switches into
step-up mode. Employing the fractional ratio 1.5x charge
pump, the LTC3206 provides more efficiency than would
be achieved with a voltage doubling charge pump.
In 1.5x boost mode, the efficiency is similar to that of a
linear regulator with an effective input voltage of 1.5 times
the actual input voltage. This is because the input current
for a 1.5x fractional charge pump is approximately 1.5
times the load current. In an ideal 1.5x charge pump, the
power efficiency would be given by:
W
U
U
η
IDEAL
LED
IN
P
LED
IN
V
LED
LED
I
LED
V
.
1 5
IN
P
V
I
V
≡
=
1 5
Thermal Management
For higher input voltages and maximum output current,
there can be substantial power dissipation in the LTC3206.
If the junction temperature increases above approximately
160
°
C the thermal shutdown circuitry will automatically
deactivate the output. To reduce the maximum junction
temperature, a good thermal connection to the PC board
is recommended. Connecting the PGND pin (exposed
center pad) to a ground plane and maintaining a solid
ground plane under the device can reduce the thermal
resistance of the package and PC board considerably.
Brightness Control
Although the LTC3206 has many exponentially spaced
brightness settings for the main and sub displays, it is
possible to control the brightness by alternative means.
Figure 8 shows an example of how an external voltage
source can be use to inject a current into the I
MS
or I
RGB
pins to control brightness. For example, if R1 and R2 are
24k, then the LED current would range from 20mA to 0mA
as V
CNTRL
is swept from 0V to 1.2V.
Alternatively, if only digital outputs are available, the
number of settings can be doubled from 15 to 30 by simply
connecting V
CNTRL
to a digital signal. This topology can be
extended to any number of bits and can also be applied to
the RGB display.
Finally, PWM brightness control can be achieved by apply-
LTC3206
I
MS
11
12
12k
R1
3206 F08
V
CNTRL
R2
I
RGB
0.6V
R1
||
R2
V
CNTRL
R2
–
I
LED
= 400
(
)
LTC3206
I
MS
11
12
12k
18.2k
3206 F09
V
0V TO 0.7V
OR HIGHER
34k
I
RGB
Figure 8. Alternative Linear Brightness Control
Figure 9. Alternative Digital Brightness Control
LTC3206
I
MS
11
12
3206 F10
PWM SIGNAL
0V TO 0.7V OR HIGHER
BRIGHTNESS = 1 – D
12k
12k
I
RGB
Figure 10. PWM Brightness Control of the MAIN and SUB Displays
ing a PWM signal to the I
MS
programming resistor as
shown in Figure 10. The signal should range from 0V (full
on) to any voltage above 0.7V (full off).
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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 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 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 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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