전자부품 데이터시트 검색엔진
  Korean  ▼
ALLDATASHEET.CO.KR

X  

LM2991 데이터시트(PDF) 6 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
부품명 LM2991
상세설명  Negative Low Dropout Adjustable Regulator
Download  12 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
제조업체  NSC [National Semiconductor (TI)]
홈페이지  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM2991 데이터시트(HTML) 6 Page - National Semiconductor (TI)

Back Button LM2991_00 Datasheet HTML 2Page - National Semiconductor (TI) LM2991_00 Datasheet HTML 3Page - National Semiconductor (TI) LM2991_00 Datasheet HTML 4Page - National Semiconductor (TI) LM2991_00 Datasheet HTML 5Page - National Semiconductor (TI) LM2991_00 Datasheet HTML 6Page - National Semiconductor (TI) LM2991_00 Datasheet HTML 7Page - National Semiconductor (TI) LM2991_00 Datasheet HTML 8Page - National Semiconductor (TI) LM2991_00 Datasheet HTML 9Page - National Semiconductor (TI) LM2991_00 Datasheet HTML 10Page - National Semiconductor (TI) Next Button
Zoom Inzoom in Zoom Outzoom out
 6 / 12 page
background image
Application Hints (Continued)
MINIMUM LOAD
A minimum load current of 500 µA is required for proper op-
eration. The external resistor divider can provide the mini-
mum load, with the resistor from the adjust pin to ground set
to 2.4 k
Ω.
SETTING THE OUTPUT VOLTAGE
The output voltage of the LM2991 is set externally by a resis-
tor divider using the following equation:
V
OUT =VREF x(1+R2/R1)−(IADJ xR2)
where V
REF
= −1.21V. The output voltage can be pro-
grammed within the range of −3V to −24V, typically an even
greater range of −2V to −25V. The adjust pin current is about
60 nA, causing a slight error in the output voltage. However,
using resistors lower than 100 k
Ω makes the adjust pin cur-
rent negligible. For example, neglecting the adjust pin cur-
rent, and setting R2 to 100 k
Ω and V
OUT to −5V, results in an
output voltage error of only 0.16%.
ON/OFF PIN
The LM2991 regulator can be turned off by applying a TTL or
CMOS level high signal to the ON/OFF pin (see Adjustable
Current Sink Application).
FORCING THE OUTPUT POSITIVE
Due to an internal clamp circuit, the LM2991 can withstand
positive voltages on its output. If the voltage source pulling
the output positive is DC, the current must be limited to 1.5A.
A current over 1.5A fed back into the LM2991 could damage
the device. The LM2991 output can also withstand fast posi-
tive voltage transients up to 26V, without any current limiting
of the source. However, if the transients have a duration of
over 1 ms, the output should be clamped with a Schottky di-
ode to ground.
Typical Applications
Output Capacitor ESR Range
DS011260-5
Fully Isolated Post-Switcher Regulator
DS011260-6
www.national.com
6


유사한 부품 번호 - LM2991_00

제조업체부품명데이터시트상세설명
logo
Texas Instruments
LM2991GW-QML TI-LM2991GW-QML Datasheet
391Kb / 15P
[Old version datasheet]   LM2991QML Negative Low Dropout Adjustable Regulator
LM2991GW-QML TI1-LM2991GW-QML Datasheet
414Kb / 15P
[Old version datasheet]   Negative Low Dropout Adjustable Regulator
logo
National Semiconductor ...
LM2991J NSC-LM2991J Datasheet
338Kb / 11P
   Negative Low Dropout Adjustable Regulator
LM2991J-QML NSC-LM2991J-QML Datasheet
338Kb / 11P
   Negative Low Dropout Adjustable Regulator
LM2991J-QML NSC-LM2991J-QML Datasheet
688Kb / 13P
   Negative Low Dropout Adjustable Regulator
More results

유사한 설명 - LM2991_00

제조업체부품명데이터시트상세설명
logo
Texas Instruments
LM2991 TI1-LM2991 Datasheet
1Mb / 19P
[Old version datasheet]   Negative Low Dropout Adjustable Regulator
LM2991QML TI1-LM2991QML Datasheet
414Kb / 15P
[Old version datasheet]   Negative Low Dropout Adjustable Regulator
logo
National Semiconductor ...
LM2991QML NSC-LM2991QML Datasheet
688Kb / 13P
   Negative Low Dropout Adjustable Regulator
LM2991 NSC-LM2991 Datasheet
338Kb / 11P
   Negative Low Dropout Adjustable Regulator
logo
Texas Instruments
LM2991GW-QML TI-LM2991GW-QML Datasheet
391Kb / 15P
[Old version datasheet]   LM2991QML Negative Low Dropout Adjustable Regulator
LM2991S TI-LM2991S Datasheet
1Mb / 19P
[Old version datasheet]   LM2991 Negative Low Dropout Adjustable Regulator
LM2991 TI-LM2991_15 Datasheet
1Mb / 19P
[Old version datasheet]   LM2991 Negative Low Dropout Adjustable Regulator
LM2991S TI-LM2991S Datasheet
1Mb / 19P
[Old version datasheet]   LM2991 Negative Low Dropout Adjustable Regulator
logo
Intersil Corporation
ISL72991RH INTERSIL-ISL72991RH Datasheet
210Kb / 3P
   Radiation Hardened Negative Low Dropout Adjustable Voltage Regulator
logo
Renesas Technology Corp
ISL72991RH RENESAS-ISL72991RH Datasheet
562Kb / 15P
   Radiation Hardened Low Dropout Adjustable Negative Voltage Regulator
Jun 16, 2022
More results


Html Pages

1 2 3 4 5 6 7 8 9 10 11 12


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