NX2422 datasheet(7/20 Pages) MICROSEMI

Part #	NX2422

Description	TWO PHASE SYNCHRONOUS PWM CONTROLLER WITH INTEGRATED FET DRIVER, DIFFERENTIAL CURRENT SENSE & 5V BIAS REGULATOR

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Manufacturer	MICROSEMI [Microsemi Corporation]

Direct Link	http://www.microsemi.com

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7 / 20 page

NX2422

7

Rev.2.1

12/01/08

BLOCK DIAGRAM

Figure 2 - Block diagram of NX2422

OFF

ON

CScomp(SS/EN)

PWM control

logic

and driver

V1.25

Slave channel control

FB

VCOMP

EN2_B

0.82/0.74

Bias

generator

5VCC

1.25V

1.6V

0.6V

UVLO

ramp1

S

R

Q

Set1

FET

driver

ramp2

set2

start

Hiccup

Digital

start

Dis_EA

SS_finish

Rt

6 Cycles

filter

Hiccup

Logic

Hiccup

BST1

DrvH1

PVCC

DrvL1

PGND

CS+1

CS-1

CS+2

CS-2

Vp*75%

SS_finished

AGND

Two phase

OSC

÷

2

Σ

V1.25

gm=0.04mA/V

KR

R

CS01

CS02

BST2

DrvH2

DrvL2

SW1

SW2

IOUT/IMAX

Vp*130%

OVP

K=30

1.25V

FB

VOUT

+1.2V/50A

+5V

+12V

VOUT

+5V

0.35

/0.3V

FB

Vp*70%

SS_FINISHED

DAC

REFIN

Vp

3.6

/3.3V

0.6V

1.25V

FILTER

+5V

+12V

VCCDRV

1.25V

INREFOUT/POK

ENBUS_2

ON

OFF

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