NX2309 datasheet(10/16 Pages) MICROSEMI

Part #	NX2309

Description	SINGLE SUPPLY 12V SYNCHRONOUS PWM CONTROLLER WITH NMOS LDO CONTROLLER

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Manufacturer	MICROSEMI [Microsemi Corporation]

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10 / 16 page

NX2309

10

Rev. 2.0

12/19/05

Case 2:

F

LC<FESR<FO(for electrolytic capacitors)

Figure 5 - Bode plot of Type III compensator

(F

LC<FESR<FO)

40dB/decade

20dB/decade

loop gain

LC

F

ESR

F

compensator

power stage

FZ1 Z2

F

O

F

FP2

P1

F

=

×π××

=

×π××

=Ω

3

P13

1

R

2

FC

1

2

40.6kHz 2.5nF

1.45k

Choose R

3 =1.43kΩ.

If electrolytic capacitors are used as output

capacitors, typical design example of type III

compensator in which the crossover frequency is

selected as F

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

as the following steps. Here two SANYO MV-WG1000

with 30 m

Ω is chosen as output capacitor, output inductor

is 2.2uH. See figure 18.

1. Calculate the location of LC double pole F

LC

and ESR zero F

ESR.

=

×π ××

=

×π ××

=

LC

OUT

1

F

2

LC

1

2

2.2uH 2000uF

1.8kHz

=

×π ××

=

×π ×

Ω×

=

ESR

OUT

1

F

2

ESRC

1

2

15m

2000uF

5.3kHz

2. Set R

2 equal to 15kΩ.

×

Ω×

=

=Ω

2

REF

1

OUT

REF

RV

15k

0.8V

R =

12k

V

-V

1.8V-0.8V

Choose R

1=12kΩ.

3. Set zero F

Z2 = FLC and Fp1 =FESR .

4. Calculate C

3 .

×

×π×

×

×π ×Ω

3

2

z2

p1

1

11

C =

(-)

2

R

FF

1

11

=

(

-)

2

15k

1.8kHz

5.3kHz

=2.4nF

Choose C

3=2.7nF.

5. Calculate R

3 .

=

×π ××

=

×π ××

=Ω

3

P13

1

R

2

FC

1

2

5.3kHz

2.7F

11.1k

Choose R

3 =11kΩ.

6. Calculate R

4 with FO=30kHz.

×π ×

××

+

×π ×

×

Ω ×Ω

××

Ω

Ω +Ω

Ω

OSC

O

23

4

in

23

V

2

F

L

RR

R=

V

ESR

RR

1.1V

2

30kHz

2.2uH

15k

11k

=

12V

15m

15k

11k

=16k

Choose R

4=16kΩ.

7. Calculate C

2 with zero Fz1 at 75% of the LC

double pole by equation (11).

=

×π ××

=

×π ×

×

×Ω

=

2

Z14

1

C

2

FR

1

2

0.75 1.8kHz 16k

4.2nF

Choose C

2=4.7nF.

8. Calculate C

1 by equation (14) with pole Fp2 at

half the switching frequency.

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