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參數(shù)資料
| 型號(hào)： | LX1991-03EVALKIT |
| 元件分類： | LED驅(qū)動(dòng)器 |
| 英文描述： | LED Driver |
| 中文描述： | LED驅(qū)動(dòng)器 |
| 文件頁(yè)數(shù)： | 4/6頁(yè) |
| 文件大?。?/td> | 83K |
| 代理商： | LX1991-03EVALKIT |
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
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LX1991ILQ | 功能描述:IC LED DRIVER LINEAR 16-MLPQ RoHS:是 類別:集成電路 (IC) >> PMIC - LED 驅(qū)動(dòng)器 系列:- 標(biāo)準(zhǔn)包裝:6,000 系列:- 恒定電流:- 恒定電壓:- 拓?fù)?開路漏極，PWM 輸出數(shù):4 內(nèi)部驅(qū)動(dòng)器:是 類型 - 主要:LED 閃爍器 類型 - 次要:- 頻率:400kHz 電源電壓:2.3 V ~ 5.5 V 輸出電壓:- 安裝類型:表面貼裝 封裝/外殼:8-VFDFN 裸露焊盤 供應(yīng)商設(shè)備封裝:8-HVSON 包裝:帶卷 (TR) 工作溫度:-40°C ~ 85°C 其它名稱:935286881118PCA9553TK/02-TPCA9553TK/02-T-ND |
| LX1991ILQTR | 制造商:Microsemi Corporation 功能描述:LED DRVR 54Segment 5V 16-Pin MLPQ EP T/R |
| LX1991ILQ-TR | 制造商:Microsemi Corporation 功能描述:LED DRVR 54SEGMENT 5V 16MLPQ - Tape and Reel |
| LX1992 | 制造商:MICROSEMI 制造商全稱:Microsemi Corporation 功能描述:High Efficiency LED Driver |
| LX1992-01EVALKIT | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:LED Driver |
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