NX2422 データシートの表示（PDF） - Microsemi Corporation

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NX2422

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

Microsemi Corporation 

BLOCK DIAGRAM

+12V

VCCDRV

1.25V

OFF

ON

+5V

5VCC

Bias

0.6V

generator

1.6V

UVLO

UVLO

1.25V

+5V

ON

OFF

EN2_B

0.82/0.74

ENBUS_2

start

Hiccup

0.35

/0.3V

REFIN

DAC

0.6V

FILTER

PVCC

+5V

OVP

BST1

DrvH1

SW1

FET

driver

DrvL1

PGND

3.6

VOUT /3.3V

FB

VCOMP

Rt

Vp*130%

Digital

start

Vp

SS_finish

Dis_EA

ramp1

Set1

Two phase

OSC

set2

ramp2

ENBUS_2

RQ

S

BST2

DrvH2

SW2

DrvL2

K=30

KR

V1.25

R

CS01

CS02

KR

R

PWM control

logic

and driver

CS+1

CS-1

FILTER

OVP

V1.25

KR R

CS+2

FB

Vp*75%

R

KR

Slave channel control

CS-2

CScomp(SS/EN)

SS_finished

Hiccup Hiccup

Logic

V1.25

Σ

÷

2

gm=0.04mA/V

Σ

IOUT/IMAX

INREFOUT/POK

1.25V

6 Cycles

filter

1.25V

AGND

SS_FINISHED

Vp*70%

FB

NX2422

+12V

VOUT

+1.2V/50A

Figure 2 - Block diagram of NX2422

Rev.2.1

7

12/01/08

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