Rainbow-electronics MAX1813 Manual do Utilizador Página 31

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MAX1813
Dynamically-Adjustable, Synchronous Step-Down
Controller with Integrated Voltage Positioning
______________________________________________________________________________________ 31
MAX1813
D4
D3
D2
D1
D0
ZMODE
3.0V TO 5.5V
ZMODE HIGH
VID = 01010
1.25V
ZMODE LOW
VID = 01100
1.15V
100k
100k
ZMODE = HIGH = 1.25V
ZMODE = LOW = 1.15V
Figure 12. Using the Internal Mux with Hard-Wired Logic-Mode
and Impedance-Mode DAC Codes
MAX1813
D4
D3
D2
D1
D0
ZMODE
ZMODE = HIGH = 1.25V
ZMODE = LOW = 1.15V
1k
1k100k
1k
100k
2.7V TO 5.5V
NOTE: USE PULLUP FOR LOGIC MODE 1, PULLDOWN FOR LOGIC MODE 0.
USE 100k FOR IMPEDANCE MODE 1, 1k FOR IMPEDANCE MODE 0.
Figure 13. Using the Internal Mux with Both VID Codes
Resistor-Programmed
Figure 11. Three-State Operating Mode Control
SKP/SDN
INV1
R1
120k
SUS
V
CC
INV2
INV3
R2
80k
R3
30k
C1
10nF
ON/OFF
SUSPEND
SUSPEND
SKIP
(2.8V TO 6V)
MAX1813
OPERATING
MODE
FORCED-PWM
(1.4V TO 2.2V)
SHUTDOWN
(0 TO 0.5V)
t
DELAY
t
DELAY
MAX1813
ON/OFF
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