LX1742 데이터 시트보기 (PDF) - Microsemi Corporation
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LX1742 Datasheet PDF : 13 Pages
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INTEGRATED PRODUCTS
LX1742
High Efficiency High Voltage Boost Controller
PRODUCTION DATA SHEET
APPLICATION CIRCUITS
Typical LCD Bias Applications
VBAT = (1.6V to 6.0V)
L1
47µH
IN
SW
SHDN
OUT
LLXX1774422
ADJ
FB
CS
GND
CR1
UPS5819
R1
VOUT
=
VREF ⎜⎜⎝⎛1 +
R1
R2
⎟⎟⎠⎞
C2*
1nF
C1
10µF
RCS
R2
4kΩ
* Optional Component
used to reduce output
voltage ripple.
Figure 1 – Circuit Showing Fixed Output Voltage Operation Using an External Schottky Diode Switch (CR1).
VBAT = (1.6V to 6.0V)
100kHz
VPWM = 3.0V
RPWM
625kΩ
L1
47µH
IN
SHDN
SW
OUT
LLXX1774422
FB
ADJ
CS
GND
CR1
UPS5819
R1
RCS R2
4kΩ
VOUT
=
VADJ⎜⎜⎝⎛1+
R1
R2
⎟⎟⎠⎞
C2*
1nF
C1
10µF
* Optional Component
used to reduce output
voltage ripple.
Figure 2 – Circuit Showing Dynamic Output Voltage Operation Via PWM Input Using an External Schottky Diode
Switch (CR1).
Note: An in-series RPWM will attenuate the PWM amplitude to the proper signal level at the ADJ pin. With the RPWM value shown, a
PWM signal having a duty of 30% to 50% will generate 0.9V to 1.5V at the ADJ pin.
Copyright © 2000
Rev. 1.0b, 2005-03-03
Microsemi
Integrated Products Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 4
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