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MIC21LV32 Datasheet(PDF) 34 Page - Microchip Technology

Part No. MIC21LV32
Description  36V Dual Phase, Advanced COT Buck Controller Stackable for Multiphase Operation
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Manufacturer  MICROCHIP [Microchip Technology]
Direct Link  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

MIC21LV32 Datasheet(HTML) 34 Page - Microchip Technology

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MIC21LV32
DS20006513A-page 34
 2021 Microchip Technology Inc.
The capacitance of the input capacitor can be
determined in Equation 5-17:
EQUATION 5-17:
The ESR of the total input capacitance can be
determined in Equation 5-18:
EQUATION 5-18:
The input capacitor must be rated for the input current
ripple. The rated RMS value of the input capacitor cur-
rent is determined at the maximum output current.
Assuming the peak-to-peak inductor current ripple is
low, the RMS current rating of the input capacitor can
be estimated from Equation 5-19:
EQUATION 5-19:
The graph in Figure 5-2 shows the normalized RMS
input ripple current vs. duty cycle for both single-phase
and two-phase buck converter operation. Data are
normalized to the output current.
FIGURE 5-2:
Normalized RMS Input
Ripple Current vs. Duty Cycle.
For a two-phase buck converter operating at duty cycle
D, the input RMS current can also be determined from
the graph in Figure 5-2, together with Equation 5-20
below.
EQUATION 5-20:
The power dissipated in the input capacitor can then be
computed from Equation 5-21:
EQUATION 5-21:
The voltage rating of the input capacitor must be high
enough to withstand the high input voltage. The
recommended voltage rating is at least 1.25 times the
maximum input voltage.
5.4
Switch Power MOSFET Selection
The following parameters are important for MOSFET
selection:
• Voltage rating
• Current rating
• On-resistance
• Total gate charge
The voltage rating for both the high-side and low-side
MOSFETs in the buck converter is essentially equal to
the power stage input voltage, VIN. A safety factor of
30% should be added to the VIN(MAX), while selecting
the voltage rating of the MOSFETs to account for
voltage spikes due to circuit parasitic elements, as
shown in Equation 5-22.
EQUATION 5-22:
The peak switch current for both the high-side and
low-side MOSFET in the buck converter is the same, and
is equal to the peak inductor current in each phase, as
shown in Equation 5-23 on the next page.
Where:
k = 0,1,2,3,.... for D > k/n and k < n
n = Total Number of Phases
CIN
k
n
fSW × CIN
IOUT × D –×
1
n
[]
– D –
k
n
ESRCIN VIN ×
n
IOUT
Where:
IOUT(MAX) = Maximum Output Current
k = 0,1,2,3,.... for D > k/n and k < n
n = Total Number of Phases
ICIN(RMS) ≈ IOUT(MAX) ×
k
n
D –×
1
n
[]
– D –
k
n
ICIN(RMS) = ICINRMS(NORM) × IOUT(MAX)
Where:
ICINRMS(NORM) = Normalized Input Ripple Current at
given Duty Cycle for Two-Phase
Buck Converter from Figure 5-2
PDISS(CIN) = ICIN(RMS)2 × ESRCIN
VDS(RATING) ≥ VIN(MAX) × 1.3


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