SC2608BSTRT datasheet(8/11 Pages) SEMTECH

tên linh kiện	SC2608BSTRT

Giải thích chi tiết về linh kiện	Simple, Synchronous Voltage Mode PWM Controller

PDF	11 Pages

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nhà sản xuất	SEMTECH [Semtech Corporation]

Trang chủ	http://www.semtech.com

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POWER MANAGEMENT

SC2608B

(6) The final step is to generate the Bode plot by using

the simulation model in Fig. 4 or using the equations pro-

vided here with Mathcad. The phase margin can then be

checked using the Bode plot.

Applications Information (Cont.)

(5) The compensation capacitor is determined by choos-

ing the compensator zero to be about one fifth of the

output filter corner frequency:

SC2608B soft start time is determined by the

compensation capacitor. Capacitance can be adjusted

to satisfy the soft start requirement.

An example is given below to demonstrate the proce-

dure introduced above.

set to

for suitable soft start time

Fig. 5. Bode plot of the loop

100

1 .10

100

Loop Gain Mag (dB)

mag i

()

100

1 .10

180

135

Loop Gain Phase (Degree)

phase i

()

set

zero

•

in=12V

o=2.5V

sw=250KHz

o=15A

i=1nF

o=4400uF

c=0.009Ω

ramp=1V

m=0.007A/V

bg=0.8V

C=327.95nF

c=1.33KΩ

c=1.5KΩ

C=100nF

set to

L=2.2uH

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