Rainbow-electronics MAX5439 Manual de usuario Pagina 9

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MAX5436–MAX5439
±15V, 128-Tap, Low-Drift Digital Potentiometers
_______________________________________________________________________________________ 9
CONTROL
V
BATT
V
OUT
(LCD BIAS)
MICROCONTROLLER/MICROPROCESSOR
FIXED ±28V IN
LCD
PANEL
±16V TO ±26V CONTRAST ADJUST
DC/DC CONVERTER
(SIMPLIFIED)
MAX5436–
MAX5439
MAX629
Figure 5a. Simplified LCD Contrast Control Circuit
H
L
R1
R2
+15V
-15V
V
S
V
O
V
O
/V
S
= 1 + R
2
/R
1
W
MAX5436
MAX5439
MAX427
Figure 4. Noninverting Amplifier
CONTROL
V
BATT
V
OUT
(LCD BIAS)
MICROCONTROLLER/MICROPROCESSOR
FIXED ±28V IN
LCD
PANEL
±16V TO ±26V CONTRAST ADJUST
DC/DC CONVERTER
(SIMPLIFIED)
MAX5437/
MAX5439
MAX629
Figure 5b. Simplified LCD Contrast Control Circuit with Buffer
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