Rainbow-electronics MAX15023 Manual do Utilizador Página 11

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MAX15023
Wide 4.5V to 28V Input, Dual-Output
Synchronous Buck Controller
______________________________________________________________________________________ 11
Functional Diagram
OSCILLATOR
ENABLE
LOGIC
VREF
RT
EN1
ENABLE1
COMPARATOR
THERMAL
SHUTDOWN
BANDGAP
REFERENCE
STARTUP
BIAS
VREF
VREF = 0.6V
VREF
EN2
SGND
IN
LIM2
LIM1
V
CC
ENABLE2
COMPARATOR
IN
UVLO
V
CC
UVLO
INTERNAL
VOLTAGE
REGULATOR
LIM
CURRENT
GENERATOR
MAX15023 GEN
VREF
CK2
CK1
ENABLE1 ENABLE2
VREF
CK2
LIM2
SGND LIM1
CK1
ENABLE1
ENABLE1
g
M
V
REF
ENABLE2
DC-DC CONVERTER 2
DC-DC CONVERTER 1
SOFT-START/
STOP LOGIC
AND
HICCUP LOGIC
COMP2 BST2 DH2 PGND2
PGOOD2 FB2 DL2 LX2
MAX15023
VREF
0.925 x V
REF
CK1
FB1
DAC_VREF
PWM
COMPARATOR
RAMP
GENERATOR
BOOST
DRIVER
LOW-SIDE DRIVER
SINK
CURRENT-LIMIT
COMPARATOR
PGOOD
COMPARATOR
SOURCE
CURRENT-LIMIT
COMPARATOR
HIGH-
SIDE
DRIVER
PWM
PWM
CONTROL
LOGIC
RAMP
GATEP
HICCUP TIMEOUT
HICCUP
HICCUP
V
CC
LIM1/20
LIM1/10
HICCUP
TIMEOUT
COMP1
BST1
DH1
LX1
DL1
PGND1
FB1
PGOOD1
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