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SC1403ITSTR 데이터시트(PDF) 11 Page - Semtech Corporation

부품명 SC1403ITSTR
상세설명  Mobile Multi-Output PWM Controller with Virtual Current SenseTM
PDF  30 Pages
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제조업체  SEMTECH [Semtech Corporation]
홈페이지  http://www.semtech.com
Logo SEMTECH - Semtech Corporation

SC1403ITSTR 데이터시트(HTML) 11 Page - Semtech Corporation

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11
 2002 Semtech Corp.
www.semtech.com
SC1403
POWER MANAGEMENT
PRELIMINARY
SC1403 Startup Sequence Chart
Design Guidelines
The schematic for the reference circuit is shown on page 24. The
reference circuit is configured as follows:
Switching Regulator 1
Vout1 = 3.3V @ 6A
Switching Regulator 2
Vout2 = 5.0V @ 6A
Linear Regulator
Vout3 = 5.0V @ 50mA
Designing the Output Filter
Before calculating the output filter inductance and output
capacitance, an acceptable amount of output ripple current is to
be determined. The maximum allowable ripple current depends
on the transient requirement of the power supply. Under normal
situation, the ripple current is usually set at 10 to 20% of the
maximum load. However, in order to speed up the output transient
response, ripple current can be much higher. In this design, we are
going to set the ripple current to be 40% of maximum load. So
once the ripple voltage specification is determined, the capacitor
ESR is chosen. The output ripple voltage is usually specified at +/
- 1% of the output voltage.
Functional Information (Cont.)
For the reference circuit 3.3V switcher, we selected a maximum
ripple voltage of 33mV. Choosing one 180uF, 4V Panasonic SP
Polymer Aluminum Electrolytic Cap, of which ESR is 15 Ω
m , sets
the maximum ripple current as follows:
Checking to see if the maximum RMS current can be met by the
SP cap.
Irms=0.635 A << Irms_rated=3.0A
The output inductance can now be found by:
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