Rainbow-electronics MAX786 Manual do Utilizador descarregar pdf (Página 9)

MAX786

Dual-Output Power-Supply

Controller for Notebook Computers

_______________________________________________________________________________________ 9

A synchronous rectifier at LX3 keeps efficiency high by

clamping the voltage across the rectifier diode.

Maximum current limit is set by an external low-value

sense resistor, which prevents excessive inductor cur-

rent during start-up or under short-circuit conditions.

Programmable soft-start is set by an optional external

capacitor; this reduces in-rush surge currents upon

start-up and provides adjustable power-up times for

power-supply sequencing purposes.

+5V LDO

LINEAR

REGULATOR

V+

REF

SHDN

GND

+3.3V

REFERENCE

3.3V

2.8V

SYNC

300kHz/200kHz

OSCILLATOR

STANDBY

4.5V

FAULT

3.3V

PWM

CONTROLLER

(SEE FIG. 3)

FB3

CS3

BST3

DH3

LX3

DL3

SS3

FB5

CS5

BST5

DH5

LX5

DL5

SS5

PGND

ON3

PWM

CONTROLLER

(SEE FIG. 3)

1.65V

ON5

Figure 2. MAX786 Block Diagram

1 2 3 4 5 6 7 8 9 10 11 12 13 14 ... 19 20

Dual-Output Power-Supply 1

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