Rainbow-electronics MAX786 Manual do Utilizador descarregar pdf (Página 16)

MAX786

V+ VL

23 22

V+

33µF

35V

R10

OPEN

SS3

GND

PGND

BST3

DH3

LX3

DL3

CS3

FB3

ON3

ON5

SHDN

BST5

DH5

LX5

DL5

CS5

FB5

REF

SYNC

3.3V

OUT

150µF

10V

C12

150µF

10V

10µH

1N5819

SHDN

SYNC

1µF

20V

1N5819

10µH

0.025Ω

OUT

330µF

10V

4.7µF

C10

33µF

35V

0.025Ω

0.01µF

SW1CSW1A

SW1B

SS5

VREF (3.3V)

SW1D

0.1µF

N1 – N4 = Si9410DY

D2 = BAW56L OR TWO 1N4148s

VL (5V)

0.01µF

ON3

ON5

0.1µF

MAX786

Dual-Output Power-Supply

Controller for Notebook Computers

16 ______________________________________________________________________________________

Other ways to shut down the MAX786 are suggested

in the applications section of the MAX782/MAX783

data sheet.

__________Applications Information

Low-Voltage (6-Cell) Operation

The standard application circuit can be configured to

accept input voltages from 5.5V to 12V by changing

the oscillator frequency to 200kHz and increasing the

+5V filter capacitor to 660µF. This allows stable opera-

tion at 5V loads up to 2A (the 3.3V side requires no

changes and still delivers 3A).

Figure 6. MAX786 EV Kit Schematic

Table 3. EV Kit Power-Supply Controls (SW1)

SWITCH NAME FUNCTION

SETTING

OFF

SETTING

1 SHDN

Enable shutdown

mode

Operate Shutdown

2 ON3

Enable 3.3V

power supply

3.3V ON 3.3V OFF

3 ON5

Enable 5.0V

power supply

5V ON 5V OFF

4 SYNC Oscillator 200kHz 300kHz

1 2 ... 11 12 13 14 15 16 17 18 19 20

Dual-Output Power-Supply 1

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