- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄384605 > LP3950 (National Semiconductor Corporation) Color LED Driver with Audio Synchronizer PDF資料下載
參數(shù)資料
| 型號(hào)： | LP3950 |
| 廠商： | National Semiconductor Corporation |
| 英文描述： | Color LED Driver with Audio Synchronizer |
| 中文描述： | 彩色LED驅(qū)動(dòng)器與音頻同步 |
| 文件頁數(shù)： | 13/31頁 |
| 文件大小： | 1085K |
| 代理商： | LP3950 |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁第10頁第11頁第12頁當(dāng)前第13頁第14頁第15頁第16頁第17頁第18頁第19頁第20頁第21頁第22頁第23頁第24頁第25頁第26頁第27頁第28頁第29頁第30頁第31頁
Magnetic Boost DC/DC Converter
The boost DC/DC converter generates a 4.1V–5.3V output voltage to drive LEDs from a single Li-Ion battery (3.0V to 4.5V). The
output voltage is controlled with an eight-bit register in nine steps. The converter is a magnetic switching PWM mode DC/DC
converter with a current limit. The converter has three options for switching frequency, 1.0 MHz, 1.67 MHz and 2.0 MHz (default),
when the timing resistor RT is 82 k
.
The LP3950 boost converter uses an unique pulse-skipping elimination method to stabilize the noise spectrum. Even with light
load or no load a minimum length current pulse is fed to the inductor. An internal active load is used to remove the excess charge
from the output capacitor when needed (Note 16). The boost converter should be disabled when there is no load to avoid idle
current consumption.
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 output voltage control changes the resistor divider in the feedback loop.
Figure 11
shows the boost topology with the protection circuitry. Four different protection schemes are implemented:
1.
Over voltage protection, limits the maximum output voltage
— Keeps the output below breakdown voltage
— Prevents boost operation if the 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 (FB) protection for no connection
4.
Duty cycle limit function, done with digital control
Note 16:
When the battery voltage is close to the output voltage, the output voltage may rise slightly over programmed value if the load on output is small and
pulse-skipping elimination is active.
Magnetic Boost DC/DC Converter Electrical Characteristics
Limits in standard typeface are for T
= +25C. Limits in
boldface
type apply over the operating ambient temperature range
(40C
≤
T
A
≤
+85C). Unless otherwise noted, specifications apply to
Figure 1
with: V
= V
DD2
= V
= 2.8V, C
=
C
VDD2
= C
VDDA
= C
VDDIO
= 100 nF, C
OUT
= C
IN
= 10 μF, C
VREF
= 100 nF, L
1
= 4.7 μH and f
BOOST
= 2.0 MHz (Note 12).
Symbol
Parameter
Conditions
I
LOAD
Load Current
3.0V
≤
V
IN
≤
4.5V
V
OUT
= 5.0V
V
OUT
Output Voltage Accuracy
(FB Pin)
3.0V
≤
V
IN
≤
4.5V
V
OUT
= 5.0V (target value), autoload OFF
Output Voltage
(FB Pin)
3.0V
<
V
IN
5.0V + V
(SCHOTTKY),
autoload OFF
1.0 mA
≤
I
LOAD
≤
300 mA
V
IN
>
5V + V
(SCHOTTKY)
Min
Typ
Max
Units
0
300
mA
1.0 mA
≤
I
LOAD
≤
300 mA
5
+5
%
1.0 mA
≤
I
LOAD
≤
300 mA
5.0
V
V
IN
–V
(SCHOTTKY)
V
20129315
FIGURE 11. Boost Converter Functional Block Diagram
L
www.national.com
13
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LP3950SL | Color LED Driver with Audio Synchronizer |
| LP3950SLX | Color LED Driver with Audio Synchronizer |
| LP3952 | 6-Channel Color LED Driver with Audio Synchronization |
| LP3952RLX | 6-Channel Color LED Driver with Audio Synchronization |
| LP3952RL | 6-Channel Color LED Driver with Audio Synchronization |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LP3950SL | 制造商:Texas Instruments 功能描述:LED DRIVER COLOUR POWERWISE LLP32 |
| LP3950SL/CSP1 | 制造商:Rochester Electronics LLC 功能描述: 制造商:Texas Instruments 功能描述: |
| LP3950SL/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 |
| LP3950SLX | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Color LED Driver with Audio Synchronizer |
| LP3950SLX/NOPB | 功能描述:IC LED DRVR WHITE BCKLGT 32-TSCP RoHS:是 類別:集成電路 (IC) >> PMIC - LED 驅(qū)動(dòng)器 系列:PowerWise® 標(biāo)準(zhǔn)包裝:1 系列:- 恒定電流:- 恒定電壓:- 拓?fù)?PWM，切換式電容器（充電泵） 輸出數(shù):1 內(nèi)部驅(qū)動(dòng)器:是 類型 - 主要:背光 類型 - 次要:白色 LED 頻率:642kHz 電源電壓:2.7 V ~ 5.5 V 輸出電壓:5V 安裝類型:表面貼裝 封裝/外殼:10-VFDFN 裸露焊盤 供應(yīng)商設(shè)備封裝:10-VSON 包裝:剪切帶 (CT) 工作溫度:-30°C ~ 85°C 產(chǎn)品目錄頁面:1371 (CN2011-ZH PDF) 其它名稱:BD1603NUV-E2CT |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。