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參數(shù)資料
| 型號： | LX1745-CPW |
| 廠商： | MICROSEMI CORP-ANALOG MIXED SIGNAL GROUP |
| 元件分類： | 顯示驅(qū)動(dòng)器 |
| 英文描述： | Triple Output Boost ? LED Driver / LCD Bias |
| 中文描述： | LED DISPLAY DRIVER, PDSO20 |
| 封裝： | TSSOP-20 |
| 文件頁數(shù)： | 3/16頁 |
| 文件大?。?/td> | 439K |
| 代理商： | LX1745-CPW |
LX1745
P
RODUCTION
D
ATASHEET
Microsemi
Integrated Products Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 3
W
M
.
C
Triple Output Boost – LED Driver / LCD Bias
I N T E G R A T E D P R O D U C T S
Copyright
2000
Rev. 1.1a, 2004-02-06
FUNCTIONAL PIN DESCRIPTION
Description
Unregulated IC Supply Voltage Input – Input range from +1.6V to 6.0V. Bypass with a 1
μ
F or greater capacitor
for operation below 2.0V.
LED MOSFET Gate Driver – Connects to an external N-Channel MOSFET.
LED MOSFET Current Sense Input - Connects to the External N-Channel MOSFET Source.
Over Voltage Programming Pin – Connects to a resistor divider between the output load and GND to set the
maximum output voltage. OVP has a voltage threshold of 1.2V
LED Current Feedback Input – Connects to a current sense resistor between the LED output load and GND to
set the LED drive current.
Common terminal for ground reference.
LED Dimming Signal Input – Provides the internal reference, via an internal filter and gain resistor, allowing for a
dynamic output LED current adjustment that corresponds to the PWM input signal duty cycle. Either a PWM
signal or analog voltage can be used. The actual BRT pin voltage range is from V
IN
to GND. Minimize the
current sense resistor power dissipation by selecting a range for V
BRT
= 0.0V to 0.5V.
Buffered Reference Output – Connected to the internal bandgap reference voltage of 1.2V.
LCD Bias Inductor Switch Connection – Internally connected to the drain of a 28V N-channel MOSFET. SW is
high impedance in shutdown.
Feedback Input – Connect to a resistive divider network between the output and GND to set the output voltage
between V
CC
(IN) and 25V. The feedback threshold is 1.29V.
LCD Bias Adjustment PWM Signal Input – Connect to an RC filter allowing for dynamic output voltage
adjustment >
±
15%, corresponding to a varying duty cycle. Either a PWM signal or analog voltage can be used.
The ADJ input voltage range is from 0.9V to V
IN
DC. The ADJx pin should be connected to ground when the
internal reference is used.
LED Driver Active-Low Shutdown Input – A logic low shuts down the LED driver circuitry and reduces the supply
current by 60
μ
A (Typ). Pull
LSHDN
high for normal operation.
LCD Bias Active-Low Shutdown Input – A logic low shuts down the LCD Bias circuitry and reduces the supply
current by 60
μ
A (Typ). Pull
SHDNx
high for normal operation.
Current-Sense Amplifier Input – Connecting a resistor between CS and GND sets the peak inductor current
limit.
Name
IN
DRV
SRC
OVP
LFB
GND
BRT
REF
SWx
FBx
ADJx
LSHDN
SHDNx
CS
P
A
C
K
A
G
E
D
A
T
A
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