Rainbow-electronics MAX746 Manuale Utente Scaricare il pdf (Pagina 10)

MAX746

High-Efficiency, PWM, Step-Down,

N-Channel DC-DC Controller

10 ______________________________________________________________________________________

LBI

REF

OUT

AV+

LBO

LOW-BATTERY

COMPARATOR

ERROR

AMPLIFIER

EXT

CONTROL

100mV

SHDN

100kHz

OSCILLATOR

+2V

REFERENCE

SLOPE-

COMPENSATION

RAMP

AGND

50mV

GND

PWM

COMPARATOR

LIGHT-LOAD

COMPARATOR

DUAL-MODE

COMPARATOR

RAMP

SOFT-START

CIRCUITRY

CURRENT-SENSE

AMPLIFIER

CURRENT-LIMIT

COMPARATOR

EXT

CHARGE-PUMP CONTROL

COMPARATOR

UNDERVOLTAGE-

LOCKOUT

COMPARATOR

T FLIP-

FLOP

4.3V

HIGH

FROM AV+

V+ PUMP

Figure 2. Block Diagram

1 2 ... 5 6 7 8 9 10 11 12 13 14 15 16

N-Channel DC-DC Controller 1

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Rainbow-electronics MAX746 Manuale Utente Pagina 10

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