- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄367620 > LX1990-02EVAL LED Driver PDF資料下載
參數(shù)資料
| 型號： | LX1990-02EVAL |
| 元件分類： | LED驅(qū)動器 |
| 英文描述： | LED Driver |
| 中文描述： | LED驅(qū)動器 |
| 文件頁數(shù)： | 4/6頁 |
| 文件大?。?/td> | 83K |
| 代理商： | LX1990-02EVAL |
LX1990 E
VALUATION
B
OARD
U
SER
G
UIDE
Copyright 2002
Rev. 0.1a, 4/9/02
Microsemi
Integrated Products
Page 4
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
W
M
.
C
L
X
1
9
0
S
E
R
G
U
I
D
E
The PWM input TP9 engaged by JP8 allows an
external PWM signal to control the output
current by duty cycle dimming. This is
accomplished by switching the I
SET
current on
and off. The practical limit to this switching
frequency is about 20Khz, at frequencies greater
than this internal delays will add errors to the
expected output duty cycle. Q1, R2 and R4
provide an open collector drive for the I
SET
resistor so a standard pulse generator can be
used for evaluation purposes. For greater detail
see the LX1990 datasheet.
Test Points TP7 and TP8 allow you to monitor
the voltage drop across the LX1990 for the I
OUTA
and I
OUTB
outputs to ground. This voltage can
range from as low as 100mV to 10V when the
outputs are off depending on the VLOAD supply
voltage.
The various jumper positions are summarized in
table 2 and test points in table 3. The factory
installed active and passive components list can
be found in table 4. Following the two tables
you will find the PCB silkscreen figure 1 and the
circuit schematic in figure 2. All necessary PCB
traces and components are on the topside of the
board. However there are PCB traces and
silkscreen on the bottom side that when
populated is used for a special version of the
evaluation board that is used internally by
Microsemi for training and demonstration
purposes.
Jumper
JB1
JB2
JB3
JB4
JB5
JB6
JB7
Function
OFF position grounds Enable input; EXT/ON connects enable to TP5 with 100K pull-up
IN position bypasses (shorts) LED1; OUT leaves LED1 connected to output LED string
IN position bypasses (shorts) LED2; OUT leaves LED2 connected to output LED string
IN position bypasses (shorts) LED3; OUT leaves LED3 connected to output LED string
IN position bypasses (shorts) LED4; OUT leaves LED4 connected to output LED string
IN position bypasses (shorts) LED5; OUT leaves LED5 connected to output LED string
IN position bypasses (shorts) LED6; OUT leaves LED6 connected to output LED string
ON position connects PWM (TP9) to RSET resistors; OFF leaves RSET connected to
ground
Table 2
– Jumper Explanation
JB8
Test
Point
TP1
TP2,4,6,10
TP3
Description
VLOAD Input, power supply to LED’s
Common Ground Reference
VDD Input to LX1990
ENABLE input can be connected to external enable signal; high or floating is on, low is
off
I
OUTA
(LX1990 pin 6)
I
OUTB
(LX1990 pin 4)
PWM Input can be connected to external pulse generator for duty cycle dimming
TP5
TP7
TP8
TP9
Table 3
– Test Point Descriptions
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LX1990EVAL | LED Driver |
| LX1990ILM | LED Driver |
| LX1991-01EVALKIT | LED Driver |
| LX1991-03EVALKIT | LED Driver |
| LX1992-01EVALKIT | LED Driver |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LX1990-02W EVAL | 制造商:Microsemi Corporation 功能描述:LED BACKLIGHT CONTROLLERS AND DRIVERS - Bulk |
| LX1990-03 EVAL KIT | 制造商:Microsemi Corporation 功能描述:LED BACKLIGHT CONTROLLERS AND DRIVERS - Bulk |
| LX1990-03EVAL | 功能描述:BOARD EVAL LED DRIVER 2CHANNEL RoHS:是 類別:編程器，開發(fā)系統(tǒng) >> 評估板 - LED 驅(qū)動器 系列:- 標(biāo)準(zhǔn)包裝:1 系列:PowerWise® 電流 - 輸出 / 通道:20mA 輸出及類型:1，非隔離 輸出電壓:17V 特點:可調(diào)光 輸入電壓:2.7 ~ 5.5 V 已供物品:板 已用 IC / 零件:LM3508 相關(guān)產(chǎn)品:LM3508TLX-ND - IC LED DRVR WHT BCKLGT 9USMDLM3508TLDKR-ND - IC LED DRVR WHT BCKLGT 9MICROSMDLM3508TLCT-ND - IC LED DRVR WHT BCKLGT 9MICROSMDLM3508TLTR-ND - IC LED DRVR WHT BCKLGT 9MICROSMD |
| LX1990-03W EVAL | 制造商:Microsemi Corporation 功能描述:LED BACKLIGHT CONTROLLERS AND DRIVERS - Bulk |
| LX1990EVAL | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:LED Driver |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。