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SC2608STRT Datasheet(PDF) 8 Page - Semtech Corporation

No. de pieza SC2608STRT
Descripción Electrónicos  Simple, Synchronous Voltage Mode PWM Controller
PDF  15 Pages
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Fabricante Electrónico  SEMTECH [Semtech Corporation]
Página de inicio  http://www.semtech.com
Logo SEMTECH - Semtech Corporation

SC2608STRT Datasheet(HTML) 8 Page - Semtech Corporation

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© 2005 Semtech Corp.
www.semtech.com
POWER MANAGEMENT
SC2608
(6) The final step is to generate the Bode plot by using the
simulation model in Fig. 4 or using the equations provided
here with Mathcad. The phase margin can then be
checked using the Bode plot.
Applications Information (Cont.)
(5) The compensation capacitor is determined by choosing
the compensator zero to be about one fifth of the output
filter corner frequency:
SC2608 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 procedure
introduced above.
set to
for suitable soft start time
Fig. 5. Bode plot of the loop
10
100
1 .10
3
1 .10
4
1 .10
5
1 .10
6
50
0
50
100
Loop Gain Mag (dB)
mag i
()
Fi
10
100
1 .10
3
1 .10
4
1 .10
5
1 .10
6
180
135
90
45
0
Loop Gain Phase (Degree)
phase i
()
Fi
set
5
o
zero
F
F
=
zero
F
R
C
•
=
π
2
1
V
in=12V
V
o=2.5V
F
sw=200KHz
I
o=15A
C
i=1nF
C
o=4400uF
R
c=0.009Ω
V
ramp=1V
G
m=0.007A/V
V
bg=0.8V
C=327.95nF
R
c=1.33KΩ
R
c=1.5KΩ
C=100nF
set to
L=2.2uH



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