Rainbow-electronics MAX5929 Manual do Utilizador descarregar pdf (Página 20)

MAX5927/MAX5929

With a 22nF gate capacitor, the inrush current, charge,

and discharge times are:

Case B: Fast Turn-On (With Current Limit)

In applications where the board capacitance (C

BOARD

)

is high, the inrush current causes a voltage drop across

SENSE

that exceeds the startup fast-comparator

threshold. The fast comparator regulates the voltage

across the sense resistor to V

FC,TH

. This effectively reg-

ulates the inrush current during startup. In this case,

the current charging C

BOARD

can be considered con-

stant and the turn-on time is:

CVR

BOARD IN SENSE

FCTH

××

pF nF

AmA

nF V nC

INRUSH

CHARGE

DISCHARGE

DISCHARGE STRONG

×+=

×+

600 22

100 0 26 5

22 10 4 60

100

289

22 10 4 60

0 096

22 10 4 60

()

Low-Voltage, Quad, Hot-Swap

Controllers/Power Sequencers

20 ______________________________________________________________________________________

INY

GATEY

INZ

GATEZ

SENSEY

SENSEZ

BOARDZ

OUTY

BOARDY

OUTZ

OFF

GND

MAX5927

MAX5929

GND

ONY, TH

ONZ, TH

DELAY

= -R

ln( )

- V

ONY, TH

= -R

ln( )

- V

ONZ, TH

DELAY

= -R

ln( )

- V

ONY, TH

- V

ONZ, TH

Figure 11. Power Sequencing: Channel Z Turns On t

DELAY

After Channel Y

1 2 ... 15 16 17 18 19 20 21 22 23 24 25

Comentários a estes Manuais

Sem comentários

Rainbow-electronics MAX5929 Manual do Utilizador Página 20

Comentários a estes Manuais

Manuais e produtos relacionados com Sensores Rainbow-electronics MAX5929