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參數(shù)資料
| 型號(hào)： | LP3933SL |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 顯示驅(qū)動(dòng)器 |
| 英文描述： | Lighting Management System for Six White LEDs and Two RGB or FLASH LEDs |
| 中文描述： | LED DISPLAY DRIVER, QCC32 |
| 封裝： | 4.50 X 5.50 MM, 0.80 MM HEIGHT, 0.50 MM PITCH, CSP-32 |
| 文件頁數(shù)： | 15/18頁 |
| 文件大?。?/td> | 406K |
| 代理商： | LP3933SL |
WLED and CLED Driver Electrical Characteristics
Symbol
I
RANGE
I
MAX
I
LEAKAGE
I
MATCH
1–4
Parameter
Conditions
Min
Typ
0–25.5
25.5
0.03
Max
Units
mA
mA
μA
Sink Current Range
Maximum Sink Current
Leakage Current
Sink Current Matching (Note
17)
V
FB
= 5V, Control 00h–FFh
(Note 16)
V
FB
= 5V
I
SINK
= 13 mA, between
WLED1...4 or CLED1...2
30
1
0.5
2.7
%
Note 16:
A minimum voltage, Dropout Voltage, is required on the WLED and CLED outputs for maintaining the LED current. The current reduction at lower voltages
is shown in the graph
WLED Output Current vs Voltage
Note 17:
Match % = 100% * (Max Min)/Min
Adjustment
WLED[7:0] or
CLED[7:0]
0000 0000
0000 0001
0000 0010
0000 0011
1111 1101
1111 1110
1111 1111
WLED or CLED
Current (Typical)
0
0.1
0.2
0.3
25.3
25.4
25.5
Units
mA
mA
mA
mA
mA
mA
mA
WLED or CLED Output Current vs Voltage
Temperatures 40C, 25C, 85C, 100C
20080523
Recommended External
Components
OUTPUT CAPACITOR, C
OUT
The output capacitor C
directly affects the magnitude of
the output ripple voltage. In general, the higher the value of
C
OUT
, the lower the output ripple magnitude. Multilayer ce-
ramic capacitors with low ESR are the best choice. At the
lighter loads, the low ESR ceramics offer a much lower V
OUT
ripple than the higher ESR tantalums of the same value. At
the higher loads, the ceramics offer a slightly lower V
OUT
ripple magnitude than the tantalums of the same value.
However, the dv/dt of the V
OUT
ripple with the ceramics is
much lower than the tantalums under all load conditions.
Capacitor voltage rating must be sufficient, 10V is recom-
mended.
INPUT CAPACITOR, C
IN
The input capacitor C
directly affects the magnitude of the
input ripple voltage and to a lesser degree the V
ripple. A
higher value C
will give a lower V
ripple. Capacitor volt-
age rating must be sufficient, 10V is recommended.
OUTPUT DIODE, D
OUT
A Schottky diode should be used for the output diode. To
maintain high efficiency the average current rating of the
schottky diode should be larger than the peak inductor cur-
rent (1A). Schottky diodes with a low forward drop and fast
switching speeds are ideal for increasing efficiency in por-
table applications. Choose a reverse breakdown of the
schottky diode larger than the output voltage. Do not use
ordinary rectifier diodes, since slow switching speeds and
long recovery times cause the efficiency and the load regu-
lation to suffer.
INDUCTOR, L
The LP3933’s high switching frequency enables the use of
the small surface mount inductor. A 10 μH shielded inductor
is suggested. Values below 4.7 μH should not be used. The
inductor should have a saturation current rating higher than
the peak current it will experience during circuit operation
(
A
1A). Less than 300 m
ESR is suggested for high effi-
ciency. Open core inductors cause flux linkage with circuit
components and interfere with the normal operation of the
circuit. This should be avoided. For high efficiency, choose
an inductor with a high frequency core material such as
ferrite to reduce the core losses. To minimize radiated noise,
use a toroid, pot core or shielded core inductor. The inductor
should be connected to the SW pin as close to the IC as
possible. Examples of suitable inductors are TDK types
LLF4017T-100MR90C and VLF4012AT-100MR79 and Coil-
craft type DO3314T-103.
L
www.national.com
15
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| LP3933SL/NOPB | 功能描述:IC LED DRVR WT/RGB BCKLGT 32TCSP RoHS:是 類別:集成電路 (IC) >> PMIC - LED 驅(qū)動(dòng)器 系列:- 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 |
| LP3933SLX | 功能描述:IC LED DRVR WT/RGB BCKLGT 32TCSP RoHS:否 類別:集成電路 (IC) >> PMIC - LED 驅(qū)動(dòng)器 系列:- 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 |
| LP3936 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Lighting Management System for Six White LEDs and One RGB or FLASH LED |
| 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 |
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