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參數(shù)資料
| 型號(hào)： | LP3936 |
| 廠商： | National Semiconductor Corporation |
| 英文描述： | Lighting Management System for Six White LEDs and One RGB or FLASH LED |
| 中文描述： | 照明管理系統(tǒng)6個(gè)白光LED和一個(gè)RGB或閃光燈LED |
| 文件頁數(shù)： | 12/20頁 |
| 文件大?。?/td> | 520K |
| 代理商： | LP3936 |
A/D Converter for Ambient Light Measurement
(Continued)
20081416
Magnetic Boost DC/DC Converter
The LP3936 Boost DC/DC Converter generates a 4.1V–5.3V supply voltage for the LEDs from single Li-Ion battery (3V … 4.5V).
The output voltage is controlled with an 8-bit register in 9 steps. The converter is a magnetic switching PFM/PWM mode DC/DC
converter with a current limit. The converter has a 1 MHz switching frequency when timing resistor RT is 82 k
.
The topology of the magnetic boost converter is called CPM control, current programmed mode, where the inductor current is
measured and controlled with the feedback. The user can program the output voltage of the boost converter. The control changes
the resistor divider in the feedback loop.
The following figure shows the boost topology with the protection circuitry. Three different protection schemes are implemented:
1) Over voltage protection, limits the maximum output voltage
a. Keeps the output below breakdown voltage.
b. Prevents boost operation if battery voltage is much higher than desired output.
2) Over current protection, limits the maximum inductor current
a. Voltage over switching NMOS is monitored; too high voltages turn the switch off.
3) Duty cycle limiting, done with digital control.
20081417
L
www.national.com
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相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LP3936SL | Lighting Management System for Six White LEDs and One RGB or FLASH LED |
| LP3936SLX | Lighting Management System for Six White LEDs and One RGB or FLASH LED |
| LP3939 | Power Amplifier Driver For Dual Band CDMA Handsets |
| LP3939ILQ | Power Amplifier Driver For Dual Band CDMA Handsets |
| LP3939ILQX | Power Amplifier Driver For Dual Band CDMA Handsets |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LP3936SL | 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 |
| LP3936SL/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 |
| LP3936SLX | 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 |
| LP3936SLX/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 |
| LP3937ILQ-AL | 制造商:Texas Instruments 功能描述:Electronic Component |
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