CAT2300VP2-GT3【PDF 5/7 页】IC SENSE FET CONTROLLER 8TDFN

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Sheet目录39

1页 2页 3页 4页 [5页]6页 7页

CAT2300

http://onsemi.com

provides gate drive for the SENSEFET and power

for CAT2300s internal circuitry and must be +5 V.

MEAS

is the mirror current output. Placing a resistor

between I

MEAS

and ground produces a voltage proportional

to I

BUS

. The maximum voltage producible at IMEAS is the

Kelvin voltage (V

) 0.1 V. This sets a limitation on the

maximum value of R

MEAS

* 0.1 V

SENSE

+ CSR

* 0.1 V

bus

where:

CSR = Current Sensing Ratio taken from the SENSEFET

data sheet.

bus

= Max current through the SENSEFET.

Enable is a high true logic input controlling the

SENSEFETs ON/OFF state. A logic high on EN turns the

switch ON; a logic low turns it OFF.

Bus turn-ON time is controlled by the FETs input gate

capacitance and the drive current applied to the gate.

To minimize power consumption EN disables the internal

gate drive current source and current mirroring circuitry

whenever the SENSEFET is OFF.

VREG

CAT2300

NTMF4834NS

GND

Sense

Kelvin

Source

Drain

Gate

250 mA

Figure 5. Typical Application

bus

OUT

Sense

MEAS

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