Rainbow-electronics MAX686 Manual de usuario Pagina 8

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MAX686
DAC-Controlled Boost/Inverter
LCD Bias Supply with Internal Switch
8 _______________________________________________________________________________________
MAX686
V
CC
V
DD
V
OUT
C
F
22pF
V
IN
= 0.8V TO 27.5V
UP
SHDN
DN
POL
GND PGND
LX
L1
22µH
DACOUT
LCDON
FB
REF
POK
ISET
0.1µF
R3
R2
D1
MBR0530L
R1
ON/OFF
DAC CONTROL
15µF
4.7µF
V
CC
= 2.7V TO 5.5V
0.1µF
0.1µF
Figure 1. Boost Configuration: Positive Output Voltage
MAX686
V
CC
V
DD
V
IN
|
V
OUT
|
27.5V
MBRO530L
D2
MBRO530L
NEGATIVE
OUTPUT
VOLTAGE
V
IN
= 0.8V TO 27.5V
UP
POL
SHDN
DN
GND PGND
LX
DACOUT
LCDON
FB
REF
POK
ISET
0.1µF
2.2µF
L1
22µH
D1
R4
2
2.2µF
R3
R2R1
ON/OFF
DAC CONTROL
C
F
100pF
V
CC
= 2.7V TO 5.5V
0.1µF
15µF
Figure 2. Negative Output Voltage Application Circuit
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