전자부품 데이터시트 검색엔진
  Korean  ▼
ALLDATASHEET.CO.KR

X  

LM21215A 데이터시트(PDF) 11 Page - Texas Instruments

부품명 LM21215A
상세설명  LM21215A-1 15A High Efficiency Synchronous Buck Regulator with Frequency Synchronization
Download  32 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
제조업체  TI [Texas Instruments]
홈페이지  http://www.ti.com
Logo TI - Texas Instruments

LM21215A 데이터시트(HTML) 11 Page - Texas Instruments

Back Button LM21215A_15 Datasheet HTML 7Page - Texas Instruments LM21215A_15 Datasheet HTML 8Page - Texas Instruments LM21215A_15 Datasheet HTML 9Page - Texas Instruments LM21215A_15 Datasheet HTML 10Page - Texas Instruments LM21215A_15 Datasheet HTML 11Page - Texas Instruments LM21215A_15 Datasheet HTML 12Page - Texas Instruments LM21215A_15 Datasheet HTML 13Page - Texas Instruments LM21215A_15 Datasheet HTML 14Page - Texas Instruments LM21215A_15 Datasheet HTML 15Page - Texas Instruments Next Button
Zoom Inzoom in Zoom Outzoom out
 11 / 32 page
background image
VIN
Time
VSW
Time
VSYNC
tSY_SW
VIH_SYNC
VIL_SYNC
LM21215A
www.ti.com
SNOSB87B – MARCH 2011 – REVISED MARCH 2013
OPERATION DESCRIPTION
GENERAL
The LM21215A-1 switching regulator features all of the functions necessary to implement an efficient low voltage
buck regulator using a minimum number of external components. This easy to use regulator features two
integrated switches and is capable of supplying up to 15A of continuous output current. The regulator utilizes
voltage mode control with trailing edge modulation to optimize stability and transient response over the entire
output voltage range. The device can operate at high switching frequency allowing use of a small inductor while
still achieving high efficiency. The precision internal voltage reference allows the output to be set as low as 0.6V.
Fault protection features include: current limiting, thermal shutdown, over voltage protection, and shutdown
capability. The device is available in the eTSSOP-20 package featuring an exposed pad to aid thermal
dissipation. The LM21215A-1 can be used in numerous applications to efficiently step-down from a 5V or 3.3V
bus.
FREQUENCY SYNCHRONIZATION
The sync (SYNC) pin allows the LM21215A-1 to be switched at an external clock frequency. When a clock signal
is present on the SYNC pin within the allowable frequency range, 300 kHz to 1.5 MHz, the device will
synchronize the turn-on of the high side FET (switch rising) to the negative edge of the clock signal, as seen in
Figure 25 . If no clock signal is present, the LM21215A-1 will default to a switching frequency of 500 kHz. The
clock signal can be present on the SYNC pin before the device is powered on with no loading on the clock
signal. Alternatively, if no clock is present while the device is powered up, it will begin switching at the default
frequency of 500 kHz. Once the clock signal is present, the device will begin synchronizing to the clock
frequency. The length of time necessary for the synchronization depends on the clock frequency.
Figure 25. Frequency synchronization
PRECISION ENABLE
The enable (EN) pin allows the output of the device to be enabled or disabled with an external control signal.
This pin is a precision analog input that enables the device when the voltage exceeds 1.35V (typical). The EN pin
has 110 mV of hysteresis and will disable the output when the enable voltage falls below 1.24V (typical). If the
EN pin is not used, it can be left open, and will be pulled high by an internal 2 µA current source. Since the
enable pin has a precise turn-on threshold it can be used along with an external resistor divider network from VIN
to configure the device to turn-on at a precise input voltage.
UVLO
The LM21215A-1 has a built-in under-voltage lockout protection circuit that keeps the device from switching until
the input voltage reaches 2.7V (typical). The UVLO threshold has 200 mV of hysteresis that keeps the device
from responding to power-on glitches during start up. If desired the turn-on point of the supply can be changed
by using the precision enable pin and a resistor divider network connected to VIN as shown in Figure 30 in the
design guide.
Copyright © 2011–2013, Texas Instruments Incorporated
Submit Documentation Feedback
11
Product Folder Links: LM21215A


유사한 부품 번호 - LM21215A_15

제조업체부품명데이터시트상세설명
logo
Texas Instruments
LM21215A TI1-LM21215A_16 Datasheet
1Mb / 38P
[Old version datasheet]   15-A Ultra High-Efficiency Synchronous Buck Converter
More results

유사한 설명 - LM21215A_15

제조업체부품명데이터시트상세설명
logo
Texas Instruments
LM21215A TI1-LM21215A Datasheet
493Kb / 26P
[Old version datasheet]   LM21215A-1 15A High Efficiency Synchronous Buck Regulator with Frequency Synchronization
LM20333 TI1-LM20333_14 Datasheet
1Mb / 30P
[Old version datasheet]   3A Synchronous Buck Regulator with Frequency Synchronization
LM21212-1 TI-LM21212-1_15 Datasheet
1Mb / 33P
[Old version datasheet]   12A High Efficiency Synchronous Point of Load Buck Regulator with Frequency Synchronization
logo
National Semiconductor ...
LM20333A NSC-LM20333A Datasheet
541Kb / 22P
   36V, 3A Synchronous Buck Regulator with Frequency Synchronization
logo
Texas Instruments
LM20333 TI-LM20333_15 Datasheet
1Mb / 29P
[Old version datasheet]   LM20333 36V, 3A Synchronous Buck Regulator with Frequency Synchronization
logo
National Semiconductor ...
LM20333 NSC-LM20333 Datasheet
520Kb / 20P
   36V, 3A PowerWise짰 Synchronous Buck Regulator with Frequency Synchronization
logo
Texas Instruments
LM21215MHX TI1-LM21215MHX Datasheet
1Mb / 33P
[Old version datasheet]   15A High Efficiency Point of Load Synchronous Buck Regulator
logo
National Semiconductor ...
LM20136 NSC-LM20136 Datasheet
543Kb / 22P
   6A, Synchronous Buck Regulator with Input Synchronization
logo
Texas Instruments
LM21212-2 TI1-LM21212-2_14 Datasheet
1Mb / 32P
[Old version datasheet]   12A High Efficiency Synchronous Buck Regulator with Adjustable Switching Frequency
LM21212-2 TI-LM21212-2_15 Datasheet
1Mb / 31P
[Old version datasheet]   12A High Efficiency Synchronous Buck Regulator with Adjustable Switching Frequency
More results


Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32


데이터시트 다운로드

Go To PDF Page


링크 URL




개인정보취급방침
ALLDATASHEET.CO.KR
ALLDATASHEET 가 귀하에 도움이 되셨나요?  [ DONATE ] 

Alldatasheet는?   |   광고문의   |   운영자에게 연락하기   |   개인정보취급방침   |   링크교환   |   제조사별 검색
All Rights Reserved©Alldatasheet.com


Mirror Sites
English : Alldatasheet.com  |   English : Alldatasheet.net  |   Chinese : Alldatasheetcn.com  |   German : Alldatasheetde.com  |   Japanese : Alldatasheet.jp
Russian : Alldatasheetru.com  |   Korean : Alldatasheet.co.kr  |   Spanish : Alldatasheet.es  |   French : Alldatasheet.fr  |   Italian : Alldatasheetit.com
Portuguese : Alldatasheetpt.com  |   Polish : Alldatasheet.pl  |   Vietnamese : Alldatasheet.vn
Indian : Alldatasheet.in  |   Mexican : Alldatasheet.com.mx  |   British : Alldatasheet.co.uk  |   New Zealand : Alldatasheet.co.nz
Family Site : ic2ic.com  |   icmetro.com