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LM21215AMHX-1/NOPB Datasheet(PDF) 17 Page - Texas Instruments

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Part No. LM21215AMHX-1/NOPB
Description  15-A Ultra High-Efficiency Synchronous Buck Converter
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Maker  TI1 [Texas Instruments]
Homepage  http://www.ti.com
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LM21215AMHX-1/NOPB Datasheet(HTML) 17 Page - Texas Instruments

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background image
FB
PGOOD
VIN
LM21215A-1
VOUT
AGND
COMP
PVIN
SYNC
SW
EN
CIN3
LF
RC1
CC1
CC2
CC3
RFB1
RFB2
RC2
PGND
AVIN
CF
1
11Å16
3
4
17
19
18
20
8,9,10
5,6,7
RF
SS/TRK
CSS
2
CIN2
CIN1
VIN
RPGOOD
CO1 CO2 CO3
OPEN
PGOOD
LM21215A
www.ti.com
SNOSB87C – MARCH 2011 – REVISED JANUARY 2016
8 Application and Implementation
NOTE
Information in the following applications sections is not part of the TI component
specification, and TI does not warrant its accuracy or completeness. TI’s customers are
responsible for determining suitability of components for their purposes. Customers should
validate and test their design implementation to confirm system functionality.
8.1 Application Information
The LM21215A is a synchronous buck DC/DC converter with a maximum output current of 15 A. The following
design procedure assists with component selection for the LM21215A. Alternately, the WEBENCH® Design Tool
is available to generate a complete design. With access to a comprehensive component database, this tool uses
an iterative design procedure to create an optimized design, allowing the user to experiment with various design
options. As well as numerous LM21215 reference designs populated in the TI Designs reference design library,
the LM21215A Quickstart Design Calculator is also available as a free download.
8.2 Typical Application
8.2.1 Typical Application 1
The schematic diagram of a 15-A regulator is given in Figure 28. The target full-load efficiency in this example is
89% at an output voltage of 1.2 V and nominal input voltage of 5 V. The free-running switching frequency (with
the SYNC pin open circuit) is 500 kHz. In terms of control loop performance, the target loop crossover frequency
is 100 kHz with a phase margin in excess of 50°.
Figure 28. Typical Application Schematic 1
8.2.1.1 Design Requirements
An example of the step-by-step procedure to generate power stage and compensation component values using
the typical application setup of Figure 28) is given in Table 1. The relevant design specifications are given in
Table 1. Here, fcrossover is the desired loop crossover frequency, which generally is less than one-fifth of the
switching frequency, and
ΔVOUT(pk-pk) is the peak-to-peak output voltage ripple.
Copyright © 2011–2016, Texas Instruments Incorporated
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