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參數(shù)資料
| 型號： | LP5520 |
| 廠商： | National Semiconductor Corporation |
| 元件分類： | LED驅(qū)動器 |
| 英文描述： | RGB Backlight LED Driver |
| 中文描述： | RGB背光LED驅(qū)動器 |
| 文件頁數(shù)： | 5/34頁 |
| 文件大?。?/td> | 790K |
| 代理商： | LP5520 |
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Block Diagram
20186111
Modes of Operation
LP5520 has three different operating modes: Manual mode,
Automatic mode and Stand-Alone mode. The Automatic
mode has two sub modes, normal mode and sequential
mode. In manual and automatic modes the chip is controlled
through the serial interface. In standalone mode only BRC
input needs to be controlled and all registers have the default
values.The modes are controlled according to the following
table.
<RGB_auto>
(RBG control bit 3)
<seq_mode[0:1]>
(RBG control bits 6 and 7)
00
00
01, 10 or 11
LP5520 Operating Mode
0
1
1
Manual mode
Automatic mode, normal operation (overlapping)
Automatic mode, sequential operation with 2, 3 or 4 pulses per sequence
MANUAL MODE
In the manual mode the automatic LED intensity adjustment
is not in use. The internal PWM control is disabled and the
LEDs are driven with DC current. The user can set the LED
currents through the serial port using three Current Control
registers,
current_control_R/G/B
, and use the external
PWM control inputs to adjust LED intensities if needed. There
is an independent PWM control pin for each output. If PWM
control is not used, the PWMR, PWMG and PWMR inputs
should be tied to the V
. All the functions implemented with
the internal PWM control are unavailable in manual mode
(logarithmic brightness control from PWM Control register,
temperature compensation, fading, sequential mode).
AUTOMATIC MODE
In the automatic mode the LED intensities are controlled with
the 12-bit PWM values obtained from the EEPROM memory
according to the temperature information. PWM values are
stored at 16°C intervals for the –40 to 120°C temperature
range, and the PWM values for the intermediate temperatures
are linearly interpolated.
When creating white light from a RGB LED, the intention is to
program PWM values, which keep the individual LED inten-
sities constant in all temperatures. For possible other appli-
cations, other kind of PWM behavior can be programmed, and
also the variable can be other than temperature if the sensor
is changed to e.g. a light sensor.
12-bit ADC is used for the measurements. The ADC has two
inputs S1_IN and S2_IN. The temperature measurement re-
sult from the S1_IN input is converted to EEPROM address
5
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相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LP5520TL | RGB Backlight LED Driver |
| LP5520TLX | RGB Backlight LED Driver |
| LP5521 | Programmable Three Channel LED Driver |
| LP5521TM | Programmable Three Channel LED Driver |
| LP5521TMX | Programmable Three Channel LED Driver |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LP5520TL | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:RGB Backlight LED Driver |
| LP5520TL/NOPB | 功能描述:LED照明驅(qū)動器 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 |
| LP5520TLX | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:RGB Backlight LED Driver |
| LP5520TLX/NOPB | 功能描述:LED照明驅(qū)動器 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 |
| LP5521 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Programmable Three Channel LED Driver |
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