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SC2545 датащи(PDF) 16 Page - Semtech Corporation

номер детали SC2545
подробное описание детали  High Performance Wide Input Range Dual Synchronous Buck Controller
PDF  24 Pages
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производитель  SEMTECH [Semtech Corporation]
домашняя страница  http://www.semtech.com
Logo SEMTECH - Semtech Corporation

SC2545 датащи(HTML) 16 Page - Semtech Corporation

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ã 2005 Semtech Corp.
www.semtech.com
SC2545
POWER MANAGEMENT
The compensator in Figure 10 includes an error ampli-
fier and impedance networks Zf and Zs. It is implemented
by the circuit in Figure 12. The compensator provides an
integrator, double poles, and double zeros. As shown in
Figure 11, the integrator is used to boost the gain at low
frequency. Two zeros are introduced to compensate ex-
cessive phase lag at the loop gain crossover due to
the integrator (-90deg) and the complex pole pair (-
180deg). Two high frequency poles are designed to com-
pensate the ESR zero and to attenuate high frequency
noise.
Fig. 11. Bode plots for control loop design.
where 0.75V is the internal reference voltage of the
SC2545.
The other components of the compensator can be cal-
culated using following design procedure:
(1). Plot the converter gain, including LC filter and PWM
modulator.
5WRS
9
9R
9
5ERW
 





Fig. 12. Compensation network.
A resistive divider is used to program the output voltage.
The top resistor Rtop of the divider in Fig. 12 can be cho-
sen from 20k : to 30k : . Then the bottom resistor
Rbot is found from:
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)S
)S
)F
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(2). Select the open loop crossover frequency Fc located
at 10% to 20% of the switching frequency. At Fc, find the
required DC gain.
(3). Use the first compensator pole Fp1 to cancel the
ESR zero Fz.
(4). Have the second compensator pole Fp2 at half the
switching frequency to attenuate the switching ripple and
high frequency noise.
(5). Place the first compensator zero Fz1 at or below
50% of the power stage resonant frequency Fo.
(6). Place the second compensator zero Fz2 at or below
the power stage resonant frequency Fo.
A MathCAD program is available upon request for the
calculation of the compensation parameters.
Applications Information (Cont.)



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