CAT2300VP2-GT3【PDF 4/7 页】IC SENSE FET CONTROLLER 8TDFN

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Sheet目录39

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CAT2300

http://onsemi.com

TYPICAL PERFORMANCE CHARACTERISTICS

Figure 3. Load Step: 1 A 10 A

50 ms / div

Bus

MEAS

PIN DESCRIPTION

Sense

Sense connects directly to the SENSEFETs Sense pin and

directs the sensed current to the I

MEAS

output. Sense is

controlled by an amplifier with a FET follower stage to

maintain Sense at exactly the Kelvin voltage, thus insuring

accuracy of the SENSEFETs mirror current.

KS = Kelvin Sense; a Kelvin connection for the mirroring

amplifier. Current measurement accuracy is dependent upon

the voltage match between the SENSEFETs Sense and

Kelvin leads. To minimize voltage losses in the PCB trace

between CAT2300 and the SENSEFET, a Kelvin connection

for the control amplifier is provided. KS must be a

dedicated connection, shared by no other circuitry, and

tied directly to the Sense pin on of the SENSEFET.

Figure 4. Current Sense

SENSEFET

Careful layout is critical in achieving full SENSEFET

perfomance. PCB trace resistance can no longer be ignored

as it can be in typical low current circuit designs. Microvolt

offsets (mV) produce meaningful errors in current ratio

tracking. A few milliohms of trace resistance carrying a few

milliamps of current produces microvolts of potential

difference between CAT2300 and the SENSEFET. To

circumvent this error CAT2300 provides a Kelvin lead (KS)

for monitoring the SENSEFETs Sense pin. Under no

circumstances should the KS connection share any portion

of the current path between the sense pins of CAT2300 and

the SENSEFET. Doing so will degrade measurement

accuracy.

Kelvin

Kelvin connects directly to the SENSEFETs Kelvin pin

and acts the reference voltage for CAT2300s mirroring

circuit. It too must be a dedicated connection, shared by no

other circuitry.

Gate

Gate connects to the SENSEFETs Gate pin and controls

the SENSEFETs operation. Gate is controlled by EN: a

logic 1 turns the SENSEFET ON, a logic 0 turns it OFF.

When ON, voltage is applied to the SENSEFETs gate via

a current source inside CAT2300.

By controlling the gate drive current a controlled turn-ON

is achieved. Faster turn-on times can be done by adding a

supplemental current source to augment the internal current

source. Placing a resistor between V

and Gate will

provide extra current and boost turn-on speeds.

For a softer turn-on characteristic, add capacitance

between the SENSEFETs Gate and Source pins;

approximately 1 nF for every ms of increased delay.

When switching OFF the SENSEFET, Gate provides a

strong pull-down, 7.5 mA typical, so the SENSEFET will be

switched off quickly.

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