參數(shù)資料
型號(hào)： LP3954
廠商： National Semiconductor Corporation
英文描述： Advanced Lighting Management Unit
中文描述： 高級(jí)照明管理單位
文件頁數(shù)： 7/56頁
文件大?。?/td> 5801K
代理商： LP3954
Modes of Operation
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 Reset Register
is written or internal Power On Reset is active. There is no dedicated Reset pin available. LP3954 can be
reset by writing any data to Reset Register in address 60H. Power On Reset (POR) will activate during the
chip startup or when the supply voltage VDD2 falls below 1.5V. Once VDD2 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, the INTERNAL STARTUP SEQUENCE powers up all the needed internal
blocks (Vref, Bias, Oscillator etc..). To ensure the correct oscillator initialization, a 10ms delay is generated
by the internal state-machine. If the chip temperature rises too high, the Thermal Shutdown (THSD) 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 PFM
mode during the 10ms delay generated by the state-machine. The Boost startup is entered from Internal
Startup Sequence if EN_BOOST is HIGH or from Normal mode when EN_BOOST is written HIGH. During
the 10ms Boost Startup time all LED outputs are switched off to ensure smooth start-up.
NORMAL:
During NORMAL mode the user controls the chip using the Control Registers. The registers can be written
in any sequence and any number of bits can be altered in a register in one write
STANDBY:
STARTUP:
20132207
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相關(guān)PDF資料
PDF描述
LP3954RL Advanced Lighting Management Unit
LP3954RLX Advanced Lighting Management Unit
LP3954TL Advanced Lighting Management Unit
LP3954TLX Advanced Lighting Management Unit
LP3958 Lighting Management Unit with High Voltage Boost Converter
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LP39542 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Advanced Lighting Management Unit
LP39542RL 制造商:Texas Instruments 功能描述:IC, LIGHTING MGNT UNIT, SMD
LP39542RL/NOPB 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
LP39542RLX 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Advanced Lighting Management Unit
LP39542RLX/NOPB 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
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