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LMZ21700 Arkusz danych(PDF) 11 Page - Texas Instruments

Numer części LMZ21700
Szczegółowy opis  LMZ21700 650 mA SIMPLE SWITCHER짰 Nano Module with 17 V Maximum Input Voltage
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Producent  TI [Texas Instruments]
Strona internetowa  http://www.ti.com
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LMZ21700 Arkusz danych(HTML) 11 Page - Texas Instruments

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CIN
22µF
_ 25V
X7R or X5R
CSS
3300pF
_10V
X7R or X5R
COUT
22µF
_ 10V
X7R or X5R
RPG
10k
1%
RFBT
41.2k
1%
RFBB
82.5k
1%
COMPONENT VALUES FOR VOUT=1.2V
VIN
EN
GND
SS
LMZ21700
CIN
CSS
VOUT
PG
FB
VOS
COUT
RPG
RFBT
RFBB
VIN
VOUT
LMZ21700
www.ti.com
SNVS872C – AUGUST 2012 – REVISED NOVEMBER 2014
8.5 Device Functional Modes
8.5.1 PWM Mode Operation
The LMZ21700 operates in PWM mode when the output current is greater than half the inductor ripple current.
The frequency variation in PWM mode is controlled and depends on the VIN and VOUT settings. Refer to the
Application Curves section for switching frequency graphs for several typical output voltage settings. As the load
current is decreased and the valley of the inductor current ripple reaches 0 A the device enters PSM operation to
maintain high efficiency.
8.5.2 PSM Operation
Once the load current decreases and the valley of the inductor current reaches 0 A, the LMZ21700 will transition
to Power Save Mode of operation. The device will remain in PSM as long as the inductor current is
discontinuous. The switching frequency will decrease linearly with the load current. If VIN decreases to about
15 % above VOUT the device will not enter PSM and will maintain output regulation in PWM mode.
9 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.
9.1 Application Information
The LMZ21700 is a step down DC-to-DC converter. It is used to convert higher DC voltage to a regulated lower
DC voltage with maximum load current of 650 mA. The following design procedure can be used to select
components for the LMZ21700. Alternatively, the WEBENCH® software can be used to select from a large
database of components, run electrical simulations, and optimize the design for specific performance. Please go
to webench.ti.com to access the WEBENCH® tool.
9.2 Typical Application
For a quick start, the following component values can be used as a design starting point for several typical output
voltage rails and 650 mA of output load current.
Figure 14. Typical Applications Circuit
Figure 15. External Component Values
( VOUT = 1.2 V )
Copyright © 2012–2014, Texas Instruments Incorporated
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