Rainbow-electronics MAX5929 Manual do Utilizador descarregar pdf (Página 22)

MAX5927/MAX5929

Layout Considerations

To take full tracking advantage of the switch response

time to an output fault condition, it is important to keep all

traces as short as possible and to maximize the high-cur-

rent trace dimensions to reduce the effect of undesirable

parasitic inductance. Place the MAX5927/MAX5929 close

to the card’s connector. Use a ground plane to minimize

impedance and inductance. Minimize the current-sense

resistor trace length (<10mm), and ensure accurate cur-

rent sensing with Kelvin connections (Figure 13).

When the output is short circuited, the voltage drop

across the external MOSFET becomes large. Hence, the

power dissipation across the switch increases, as does

the die temperature. An efficient way to achieve good

power dissipation on a surface-mount package is to lay

out two copper pads directly under the MOSFET pack-

age on both sides of the board. Connect the two pads

to the ground plane through vias, and use enlarged

copper mounting pads on the topside of the board.

Low-Voltage, Quad, Hot-Swap

Controllers/Power Sequencers

22 ______________________________________________________________________________________

MAX5927

MAX5929

GND

ON1

ON2

ON3

ON4

GND

ON1

OUT1

OUT2

*MAX5927 ONLY.

**OPTIONAL COMPONENT.

OUT3

OUT4

1nF

16V

STAT1

STAT2

STAT3

STAT4

LIM4*

BIAS

TIM

MODE

POL*

LATCH*

LIM3*

LIM2*

LIM1*

IN4

IN3

IN2

IN1

SENSE4

SENSE3

SENSE2

SENSE1

GATE1

GATE2

GATE3

GATE4

ON2

ON3

ON4

REMOVABLE CARDBACKPLANE

SENSE1

SENSE2

SENSE3

SENSE4

LIM1

** R

LIM2

** R

LIM3

** R

LIM4

LIM

Typical Operating Circuit

Figure 13. Kelvin Connection for the Current-Sense Resistors

SENSE RESISTOR

HIGH-CURRENT PATH

MAX5927

MAX5929

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

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