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7443320150 Fiches technique(PDF) 27 Page - Microchip Technology

No de pièce 7443320150
Description  High-Speed Synchronous Buck Controller
Download  44 Pages
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Fabricant  MICROCHIP [Microchip Technology]
Site Internet  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

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 2012 Microchip Technology Inc.
DS22326A-page 27
MCP19035
6.0
DESIGN EXAMPLE
This example illustrates the step-by-step design proce-
dure for a 12V to 1.8V synchronous buck converter
using the MCP19035 controller. To minimize the design
effort, Microchip provides a design tool that is used to
calculate the component values. See AN1452 - “Using
the MCP19035 Synchronous Buck Converter Design
Tool”
for further details (DS01452).
The electrical parameters are detailed in Table 6-1.
6.0.1
INDUCTOR SELECTION
The inductor must be sized for a typical ripple current
that is around 30% of maximum output current. The
inductor value calculated with Equation 5-1 is 1.16 µH.
To compensate against component tolerance, choose
the next higher standard value 1.5 µH (typically 20% for
high current inductors).
The peak current in the inductor can be calculated with
Equation 5-2, its value being 17.25A. The inductor
must sustain, without saturating, this peak current. To
maintain low-conduction losses, the DC resistance of
the inductor must be as low as possible. Table 6-2
shows some suitable inductors for this application.
TABLE 6-1:
DESIGN EXAMPLE ELECTRICAL SPECIFICATION
Parameter
Test Conditions
Min
Nominal
Max
Unit
Input Voltage (VIN)
8
12
14
V
Output Voltage (VOUT)0  IOUT  15A
1.8
V
Line Regulation
8.0V
 VIN  14V
0.5
%
Load Regulation
0A
 IOUT  15A
0.5
%
Output ripple (VOUT_RIPPLE)IOUT = 15A
30
mV
Input ripple (VIN_RIPPLE)IOUT =15A
0.3
V
Output overshoot
Step from 3.75A to 11.25A
100
mV
Output undershoot
Step from 11.25A to 3.75A
100
mV
Output current (IOUT)0
15
A
Efficiency
VIN =12V, IOUT = 10A
90
%
TABLE 6-2:
SUITABLE INDUCTORS FROM VARIOUS VENDORS
Vendor
Part Number
Inductance
(µH)
DCR
(m
)
ISAT
(A)
Coilcraft®
XAL1010-152MEB
1.5
1.76
36.6
Wurth Elektronik®
7443320150
1.5
2.1
27
TDK - EPC®
B82559A0142A013
1.4
1.5
22
Bourns®
SRP1270-1R5M
1.5
2.1
48


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