NX2415 Просмотр технического описания (PDF) - Microsemi Corporation

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NX2415

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

Microsemi Corporation 

NX2415

PIN DESCRIPTIONS

PIN #

SYMBOL

PIN DESCRIPTION

31

VCC 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.

25,

HDRV1, High side gate driver outputs.

16

HDRV2

22,

LDRV1, Low side gate driver outputs.

19

LDRV2

30

EN

This pin is used to remotely turn off the controller. The pin has a threshold

voltage of 0.6 volts.

24, 17

BST1,BST2 These pins supplies voltage to high side FET drivers.

26,15

SW1,SW2 These pins are connected to the source pins of the upper fets.

23,

PVCC1, These pins provide the supply voltage for the lower MOSFET drivers.

18

PVCC2

28

PGOOD This pin is an open collector output. If used, it should be pulled to 5V with a

resistor greater than or equal to 10k, otherwise it my be left open. Any fault or

under voltage on the enable pins will cause the signal to be pulled low.

4

VP

Input to the positive pin of the error amplifier. A resistor is connected from the

output of the DAC to this pin. Place a small capacitor from this pin to GND to

filter any noise.

5

FB

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

via a voltage divider.

2

RT

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

ground. The frequency of each phase is 1/2 of this frequency.

9,12

CS+1,CS+2 Positive input of the differential current sense amplifiers. It is connected directly

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

10,13

CS-1,CS-2 Negative input of the differential current sense amplifiers. It is connected directly

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

11

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.

6

VCOMP This is the output pin of the error amplifier. The compensation network connec-

tion.

7

Rev.4.8

05/06/08

DROOP

A resistor from this pin to ground programs an internal current source that is fed

into the FB pin. This current source is proportional to the output current of the

regulator. The product of this current times the external resistor RFB provides a

droop voltage.

5

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