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參數(shù)資料
| 型號： | LP5526TL |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 顯示驅(qū)動器 |
| 英文描述： | 4 Mbit Uniform Sector, Serial Flash Memory |
| 中文描述： | LED DISPLAY DRIVER, PBGA25 |
| 封裝： | 2.54 X 2.54 MM, 0.60 MM HEIGHT, 0.50 MM PITCH, BGA-25 |
| 文件頁數(shù)： | 8/33頁 |
| 文件大小： | 1150K |
| 代理商： | LP5526TL |
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Power-Up Sequence
When powering up the device, V
and V
should be
greater than V
DDIO
to prevent any damage to the device.
20179776
Magnetic Boost DC/DC Converter
The LP5526 Boost DC/DC Converter generates an 8…20V
supply voltage for the LEDs from single Li-Ion battery
(3V…4.5V). The output voltage is controlled with an 8-bit
register in 12 steps. The converter is a magnetic switching
PWM mode DC/DC converter with a current limit. Switching
frequency is 1MHz, when timing resistor RT is 82k
. Timing
resistor defines the internal oscillator frequency and thus
directly affects boost frequency and RGB timings.
EMI filter (R
and C
) on the SW pin can be used to
suppress EMI caused by fast switching. These components
should be as near as possible to the SW pin to ensure
reliable operation. The LP5526 Boost Converter uses pulse-
skipping elimination to stabilize the noise spectrum. Even
with light load or no load a minimum length current pulse is
fed to the inductor. An active load is used to remove the
excess charge from the output capacitor at very light loads.
Active load can be disabled by writing the EN_AUTOLOAD
bit low. Disabling active load will increase slightly the effi-
ciency at light loads, but the downside is that pulse skipping
will occur. The Boost Converter should be stopped and set to
8V when there is no load to minimize the current consump-
tion.
The topology of the magnetic boost converter is called CPM
control, current programmed mode, where the inductor cur-
rent is measured and controlled with the feedback. The user
can program the output voltage of the boost converter. The
output voltage control changes the resistor divider in the
feedback loop. The following figure shows the boost topol-
ogy with the protection circuitry. Four different protection
schemes are implemented:
1.
Over voltage protection, limits the maximum output volt-
age
— Keeps the output below breakdown voltage.
— Prevents boost operation if battery voltage is much
higher than desired output.
2.
Over current protection, limits the maximum inductor
current
— Voltage over switching NMOS is monitored; too high
voltages turn the switch off.
3.
Feedback break protection. Prevents uncontrolled op-
eration if FB pin gets disconnected.
4.
Duty cycle limiting, done with digital control.
20179777
Boost Converter Topology
L
www.national.com
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LP5526TL/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 |
| LP5526TLEV | 功能描述:電源管理IC開發(fā)工具 LP5526TL EVAL BOARD RoHS:否 制造商:Maxim Integrated 產(chǎn)品:Evaluation Kits 類型:Battery Management 工具用于評估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V |
| LP5526TLX | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Lighting Management Unit with High Voltage Boost Converter with up to 150mA Serial FLASH LED Driver |
| LP5526TLX/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 |
| LP5527 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Tiny LED Driver for Camera Flash and 4 LEDs with I2C Programmability, Connectivity Test and Audio Synchronization |
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