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參數(shù)資料
| 型號(hào)： | MAX1576 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | 480mA White LED 1x/1.5x/2x Charge Pump for Backlighting and Camera Flash |
| 中文描述： | 480mA白光LED 1倍/1.5倍/2倍電荷泵，用于背光和相機(jī)閃光燈 |
| 文件頁數(shù)： | 7/22頁 |
| 文件大?。?/td> | 2258K |
| 代理商： | MAX1576 |
MC14489B
MOTOROLA
7
a through h (Pins 1, 2, 4 – 7, 19, 20)
Anode–Driver Current Sources. These outputs are close-
ly–matched current sources which directly tie to the anodes
of external discrete LEDs (lamps) or display segment LEDs.
Each output is capable of sourcing up to 35 mA.
When used with lamps, outputs a, b, c, and d are used to
independently control up to 20 lamps. Output h is used to con-
trol up to 5 lamps dependently. (See Figure 17.) For lamps,
the No Decodemode is selected via the configuration regis-
ter, forcing e, f, and g inactive (low).
When used with segmented displays, outputs a through g
drive segments a through g, respectively. Output h is used to
drive the decimals. Refer to Figure 9. If unused, h must be left
open.
Bank 1 through Bank 5 (Pins 9, 13, 15, 16, 17)
Diode–Bank FET Switches. These outputs are low–resis-
tance switches to ground (VSS) capable of handling currents
of up to 320 mA each. These pins directly tie to the common
cathodes of segmented displays or the cathodes of lamps
(wired with cathodes common).
The display is refreshed at a nominal 1 kHz rate to achieve
optimum brightness from the LEDs. A 20% duty cycle is uti-
lized.
Special design techniques are used on–chip to accommo-
date the high currents with low EMI (electromagnetic interfer-
ence) and minimal spiking on the power lines.
POWER SUPPLY
VSS (Pin 14)
Most–negative supply potential. This pin is usually ground.
Resistor Rx is externally tied to ground (VSS). Therefore,
the chip’s VSS pin does not contain the Rx current compo-
nent.
VDD (Pin 13)
Most–positive supply potential.
To guarantee data integrity in the registers and to ensure
the serial interface is functional, this voltage may range from
3 to 6 volts with respect to VSS. For example, within this volt-
age range, the chip could be placed in and out of the low–
power mode.
To adequately drive the LEDs, this voltage must be 4.5 to
6 volts with respect to VSS.
The VDD pin contains the Rx current component plus the
chip’s current drain. In the low–power mode, the current mir-
ror and clock oscillator are turned off, thus significantly reduc-
ing the VDD current, IDD.
Figure 7. a through h Nominal Current per Output versus Rx
35
30
25
20
15
10
5
400
800
1.2 k
2.0 k
2.4 k 2.8 k
3.2 k
3.6 k
4.0 k
1.6 k
i
5 V SUPPLY
BIT D23 = HIGH (BRIGHTEN LEDs)
WITH D23 = LOW, iOH IS CUT BY
～
50%.
Rx, EXTERNAL RESISTOR (
)
NOTE: Drive current tolerance is approximately
±
15%.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX1576ETG | 功能描述:LED照明驅(qū)動(dòng)器 RoHS:否 制造商:STMicroelectronics 輸入電壓:11.5 V to 23 V 工作頻率: 最大電源電流:1.7 mA 輸出電流: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SO-16N |
| MAX1576ETG+ | 功能描述:LED照明驅(qū)動(dòng)器 White LED 1/1.5/2x Charge Pump RoHS:否 制造商:STMicroelectronics 輸入電壓:11.5 V to 23 V 工作頻率: 最大電源電流:1.7 mA 輸出電流: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SO-16N |
| MAX1576ETG+T | 功能描述:LED照明驅(qū)動(dòng)器 White LED 1/1.5/2x Charge Pump RoHS:否 制造商:STMicroelectronics 輸入電壓:11.5 V to 23 V 工作頻率: 最大電源電流:1.7 mA 輸出電流: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SO-16N |
| MAX1576ETG-T | 功能描述:LED照明驅(qū)動(dòng)器 RoHS:否 制造商:STMicroelectronics 輸入電壓:11.5 V to 23 V 工作頻率: 最大電源電流:1.7 mA 輸出電流: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SO-16N |
| MAX1576EVKIT | 功能描述:LED 照明開發(fā)工具 Evaluation Kit for the MAX1576 RoHS:否 制造商:Fairchild Semiconductor 產(chǎn)品:Evaluation Kits 用于:FL7732 核心: 電源電壓:120V 系列: 封裝: |
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