Os motores de busca de Datasheet de Componentes eletrônicos |
|
LM231 Folha de dados(PDF) 9 Page - Texas Instruments |
|
LM231 Folha de dados(HTML) 9 Page - Texas Instruments |
9 / 23 page LM231, LM331 www.ti.com SNOSBI2C – JUNE 1999 – REVISED SEPTEMBER 2015 8 Detailed Description 8.1 Overview 8.1.1 Detail of Operation, Functional Block Diagram The Functional Block Diagram shows a band gap reference which provides a stable 1.9-VDC output. This 1.9 VDC is well regulated over a VS range of 3.9 V to 40 V. It also has a flat, low temperature coefficient, and typically changes less than ½% over a 100°C temperature change. The current pump circuit forces the voltage at pin 2 to be at 1.9 V, and causes a current i = 1.90 V/RS to flow. For RS=14 k, i=135 μA. The precision current reflector provides a current equal to i to the current switch. The current switch switches the current to pin 1 or to ground, depending upon the state of the R-S flip-flop. The timing function consists of an R-S flip-flop and a timer comparator connected to the external RtCt network. When the input comparator detects a voltage at pin 7 higher than pin 6, it sets the R-S flip-flop which turns ON the current switch and the output driver transistor. When the voltage at pin 5 rises to ⅔ VCC, the timer comparator causes the R-S flip-flop to reset. The reset transistor is then turned ON and the current switch is turned OFF. However, if the input comparator still detects the voltage on pin 7 as higher than pin 6 when pin 5 crosses ⅔ VCC, the flip-flop will not be reset, and the current at pin 1 will continue to flow, trying to make the voltage at pin 6 higher than pin 7. This condition will usually apply under start-up conditions or in the case of an overload voltage at signal input. During this sort of overload the output frequency will be 0. As soon as the signal is restored to the working range, the output frequency will be resumed. 8.2 Functional Block Diagram Copyright © 1999–2015, Texas Instruments Incorporated Submit Documentation Feedback 9 Product Folder Links: LM231 LM331 |
Nº de peça semelhante - LM231_15 |
|
Descrição semelhante - LM231_15 |
|
|
Ligação URL |
Privacy Policy |
ALLDATASHEETPT.COM |
ALLDATASHEET é útil para você? [ DONATE ] |
Sobre Alldatasheet | Publicidade | Contato conosco | Privacy Policy | roca de Link | Lista de Fabricantes All Rights Reserved©Alldatasheet.com |
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 |