NX2422CMTR 查看數據表（PDF） - Microsemi Corporation

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NX2422CMTR

TWO PHASE SYNCHRONOUS PWM CONTROLLER WITH INTEGRATED FET DRIVER, DIFFERENTIAL CURRENT SENSE

Microsemi Corporation 

NX2422

PIN DESCRIPTIONS

SYMBOL

PIN DESCRIPTION

HDRV1

High side gate driver for Channel 1.

BST1

Bootstrap supply for Channel 1.

5VCC

IC’s supply voltage. This pin biases the internal logic circuits. A minimum 1uF

ceramic capacitor is recommended to connect from this pin to ground plane.

AGND

Controller analog ground pin.

EN2_B

This pin is used to startup or shutdown the channel2 only while 5VCC and REFIN is

ready. For two phase opeartion, EN2_B is preferred to be tied to GND. For one

phase opeartion, EN2_B is preferred to be tied to 5VCC. During the operation, it is

not recommended to change EN2_B voltage.

CS+1

Positive input of the channel 1 differential current sense amplifiers. It is connected

directly to the RC junction of the respective phase’s output inductor.

CS-1

Negative input of the channel 1 differential current sense amplifiers. It is con-

nected directly to the negative side of the respective phase’s output inductor.

CS-2

Negative input of the channel 2 differential current sense amplifiers. It is con-

nected directly to the negative side of the respective phase’s output inductor.

CS+2

Positive input of the channel 2 differential current sense amplifiers. It is connected

directly to the RC junction of the respective phase’s output inductor.

IOUT/IMAX

This pin indicates average output current level and sets OCP threshold using a

resistor from this pin to ground. A no more than 1nF ceramic capacitor is recom-

mended to connect this pin to ground plane to filter the noise on this pin.

RT

This pin programs the internal oscillator frequency using a resistor from this pin to

ground.

VCOMP

This is the output pin of the error amplifier.

FB

This pin is the error amplifier inverting input. It is connected to the output voltage via

a voltage divider.

CSCOMP

The output of the transconductance op amp for current balance circuit. An

external RC is connected from this pin to GND to stabilize the current loop.

REFIN

External reference input. If pull-up to >4.5V, internal reference is used. If driven by

an external voltage ranged from 0.4V to 2.5V, external reference is used with slew

rate following SS rate. If REFIN is below 0.4V, device is disabled.

INREFOUT/

POK

This pin has dual functions. When FB pin is below 75% of internal 0.6V reference,

this pin is held low. When FB reaches above this threshold, this pin is tied to an

internal 1.25V reference, allowing it to be used as a reference for any external op

amp circuitry as well as an indicator of power OK. This pin can not be connected

directly to an output capacitor. An RC network is needed which also provides a slow

ramp up of the reference for the external op amp.

Rev.2.1

5

12/01/08

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