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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)： | 8/34頁 |
| 文件大?。?/td> | 790K |
| 代理商： | LP5520 |
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START-UP SEQUENCE
RESET:
In the RESET mode all the internal registers are reset to the default values and the chip goes to STANDBY
mode after reset. <NSTBY> control bit is low after reset by default. Reset is entered always if NRST input is
low or internal Power On Reset is active. Power On Reset (POR) will activate during the chip startup or when
the supply voltage VDD falls below 1.5V. Once VDD rises above 1.5V, POR will inactivate and the chip will
continue to the STANDBY mode.
The STANDBY mode is entered if the register bit <NSTBY> is LOW. This is the low power consumption
mode, when all circuit functions are disabled. Registers can be written in this mode and the control bits are
effective immediately after power up.
When <NSTBY> bit is written high or there is a rising edge in the BRC input, the INTERNAL STARTUP
SEQUENCE powers up all the needed internal blocks (Vref, Bias, Oscillator etc..). To ensure the correct
initialization, a 10 ms delay is generated by the internal state-machine after the trim EEPROM values are
read. If the chip temperature rises too high, the Thermal Shutdown (TSD) disables the chip operation and
STARTUP mode is entered until no thermal shutdown event is present.
BOOST STARTUP:
Soft start for boost output is generated in the BOOST STARTUP mode. The boost output is raised in PWM
mode during the 20 ms delay generated by the state-machine. All LED outputs are off during the 20 ms delay
to ensure smooth startup. The Boost startup is entered from Internal Startup Sequence if <EN_BOOST> is
HIGH or from Normal mode when <EN_BOOST> is written HIGH.
NORMAL:
During NORMAL mode the user controls the chip using the Control Registers or the BRC input in stand-alone
mode. The registers can be written in any sequence and any number of bits can be altered in a register in
one write.
STANDBY:
STARTUP:
20186114
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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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