NX2423 datasheet(11/20 Pages) MICROSEMI

Part #	NX2423

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

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Manufacturer	MICROSEMI [Microsemi Corporation]

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11 / 20 page

NX2423

11

Rev. 2.1

12/01/08

two 1.5uH inductors.

1.Calculate the location of LC double pole F

LC

and ESR zero F

ESR.

LC

EFF

OUT

1

F

2

LC

1

2

0.75uH 10800uF

1.768kHz

=

×π××

=

×π××

=

ESR

OUT

1

F

2

ESRC

1

2

13m

1800uF

6.801kHz

=

×π ××

=

×π ×

Ω×

=

2.Set R

2 equal to10kΩ and calculate R1.

2

REF

1

OUT

REF

RV

10k

0.6V

R =

10k

V

-V

1.2V-0.6V

×

Ω×

=

=Ω

3. Set crossover frequency FO=15kHz.

4.Calculate R

3 value by the following equation.

OS C

O

EFF

32

in

V

2

FL

R =R

V

ESR

1 V

2

15kH z

0 .75uH

=

10k

12 V

2 .16m

=27 .3k

×π ××

××

×π ××

×

×Ω

Ω

Choose R

3 =27.4kΩ.

5. Calculate C

1 by setting compensator zero FZ

at 75% of the LC double pole.

1

3z

1

C =

2

RF

1

=

2

27.4k

0.75 1.768kHz

=4.4nF

×π××

×π×

Ω××

Choose C

1=4.7nF.

6. Calculate C

2 by setting compensator pole

p

F

at half the swithing frequency.

2

3s

1

C =

RF

1

=

27 .4 k

400k Hz

=30pF

π ××

π ×

Ω×

Choose C

2=33pF.

B. Type III compensator design

For low ESR output capacitors, typically such as

Sanyo OSCON and POSCAP, the frequency of ESR zero

caused by output capacitors is higher than the cross-

over frequency. In this case, it is necessary to compen-

sate the system with type III compensator.

In design example, six electrolytic capacitors are

used as output capacitors. The system is compensated

with type III compensator. The following figures and equa-

tions show how to realize the this type III compensator

with electrolytic capacitors.

=

×π ××

=

×π ×+×

=

×π ××

=

×

×π ××

+

Z1

42

Z2

2

33

P1

33

P2

12

4

12

1

F

...(14)

2

RC

1

F

...(15)

2

(R

R )C

1

F

...(16)

2

RC

1

F

...(17)

CC

2R

CC

where FZ1,FZ2,FP1 and FP2 are poles and zeros in

the compensator.

Zin

Zf

Vout

Vref

Fb

R2

R1

R3

R4

C3

C1

C2

Ve

Figure 5 - Type III compensator

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