NX2305CSTR datasheet(11/19 Pages) MICROSEMI

Part #	NX2305CSTR

Description	SINGLE SUPPLY 12V SYNCHRONOUS PWM CONTROLLER WITH NMOS LDO CONTROLLER, POWER GOOD & ENABLES

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Manufacturer	MICROSEMI [Microsemi Corporation]

Direct Link	http://www.microsemi.com

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11 / 19 page

NX2305

11

Rev.5.0

08/19/08

Case 1:

F

LC<FO<FESR

40dB/decade

20dB/decade

loop gain

LC

F

ESR

F

compensator

power stage

FZ1 Z2

F

O

F

FP2

P1

F

Figure 4 - Bode plot of Type III compensator

(F

LC<FO<FESR)

Typical design example of type III compensator in

which the crossover frequency is selected as

F

LC<FO<FESR and FO<=1/10~1/5Fs is shown as the

following steps.

1. Calculate the location of LC double pole F

LC

and ESR zero F

ESR.

LC

OUT

1

F

2

LC

1

2

2.2uH 940uF

3.5kHz

=

×π ××

=

×π ××

=

ESR

OUT

1

F

2

ESRC

1

2

4.5m

940uF

37.6kHz

=

×π ××

=

×π ×

Ω×

=

2. Set R

2 equal to 10kΩ.

OSCO

4

out

in3

V2

FL

R =C

VC

1.1V

2

25kHz 2.2uH

=

940uF

12V

3.9nF

=10.4k

×π ××

××

×π ××

××

Ω

Choose C

3=3.9nF, R4=10.2k.

5. Calculate C

2 with zero Fz1 at 75% of the LC

double pole by equation (11).

2

Z14

1

C

2

FR

1

2

0.75 3.5kHz 10.2k

5.95nF

=

×π ××

=

×π ×

×

×Ω

=

Choose C

2=5.6nF.

6. Calculate C

1 by equation (14) with pole Fp2 at

half the switching frequency.

1

4

P2

1

C

2

RF

1

2

10.2k

150kHz

104pF

=

×π ××

=

×π ×

Ω×

=

Choose C

1=100pF.

7. Calculate R

3 by equation (13).

3

P13

1

R

2

FC

1

2

37.6kHz 3.9nF

1.1k

=

×π××

=

×π××

=Ω

Choose R

3 =1.1kΩ.

×

Ω×

=

=Ω

2

REF

1

OUT

REF

RV

10k

0.8V

R =

8k

V

-V

1.8V-0.8V

Choose R

1=8kΩ.

3. Set zero F

Z2 = FLC and Fp1 =FESR .

4. Calculate R

4 and C3 with the crossover

frequency at 1/10~ 1/5 of the switching frequency. Set

F

O=25kHz.

3

2

z2

p1

1

11

C =

(-)

2

R

FF

1

11

=

(

-)

2

10k

3.5kHz 37.6kHz

=4.1nF

×

×π×

×

×π ×Ω

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