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LM2854 Arkusz danych(PDF) 9 Page - Texas Instruments

Numer części LM2854
Szczegółowy opis  Synchronous SIMPLE SWITCHER Buck Regulator
Download  33 Pages
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Producent  TI1 [Texas Instruments]
Strona internetowa  http://www.ti.com
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LM2854 Arkusz danych(HTML) 9 Page - Texas Instruments

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Ramp and Clock
Generator
AVIN
EN
PVIN
Gate
Drive
SW
PGND
+
-
+
-
SS
FB
Error
Amplifier
PWM
Comparator
Oscillator
0.8V
Reference
UVLO
Zc2
AGND
Current Limit
Reference
Selector
1.23V
+
-
9
LM2854
www.ti.com
SNVS560D – MARCH 2008 – REVISED JANUARY 2016
Product Folder Links: LM2854
Submit Documentation Feedback
Copyright © 2008–2016, Texas Instruments Incorporated
7 Detailed Description
7.1 Overview
The LM2854 PowerWise synchronous DC-DC buck regulator belongs to the Texas Instruments SIMPLE
SWITCHER family of switching regulators. Integration of the power MOSFETs and associated drivers,
compensation component network, and the PWM controller reduces the number of external components
necessary for a complete power supply design, without sacrificing performance.
7.2 Functional Block Diagram
7.3 Feature Description
7.3.1 Switching Frequency
The LM2854 is available in two switching frequency options, 500 kHz and 1 MHz. Generally, a higher switching
frequency allows for faster transient response and a reduction in the footprint area and volume of the external
power stage components, while a lower switching frequency affords better efficiency. These factors should be
considered when selecting the appropriate switching frequency for a given application.
7.3.2 Enable
The LM2854 features a enable (EN) pin and associated comparator to allow the user to easily sequence the
LM2854 from an external voltage rail, or to manually set the input UVLO threshold. The turnon or rising threshold
and hysteresis for this comparator are typically 1.23 V and 0.15 V, respectively. The precise reference for the
enable comparator allows the user to ensure that the LM2854 will be disabled when the system demands it to
be.
7.3.3 Soft-Start
The LM2854 begins to operate when both the AVIN and EN voltages exceed the rising UVLO and enable
thresholds, respectively. A controlled soft-start eliminates inrush currents during start-up and allows the user
more control and flexibility when sequencing the LM2854 with other power supplies. An external soft-start
capacitor is used to control the LM2854 start-up time. During soft-start, the voltage on the feedback pin is
connected internally to the non-inverting input of the error amplifier. The soft-start period lasts until the voltage on
the soft-start pin exceeds the LM2854 reference voltage of 0.8 V. At this point, the reference voltage takes over
at the non-inverting amplifier input.


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