Electronic Components Datasheet Search |
|
LTC2909CTS8-3.3 Datasheet(PDF) 9 Page - Linear Technology |
|
LTC2909CTS8-3.3 Datasheet(HTML) 9 Page - Linear Technology |
9 / 16 page LTC2909 9 2909fa If the state of the SEL pin configures a given input as “negative polarity,” the voltage at the ADJx pin must be below the trip point (0.5V nominal), or the ⎯R⎯S⎯T output will be pulled low. Conversely, if a given input is configured as “positive polarity,” the pin voltage must be above the trip point or ⎯R⎯S⎯T will assert low. Thus, a “negative polarity” input may be used to determine whether a monitored negative voltage is smaller in absolute value than it should be (–UV), or a monitored positive voltage is larger than it should be (+OV). The opposite is true for a “positive polarity” input (–OV or +UV). These usages are also shown in Table 1. For purposes of this APPLICATIO S I FOR ATIO data sheet, a negative voltage is considered “undervoltage” if it is closer to ground than it should be (e.g., –4.3V for a –5V supply). Proper configuration of the SEL pin and setting of the trip-points via external resistors allows for any two fault conditions to be detected. For example, the LTC2909 may monitor two supplies (positive, negative or one of each) for UV or for OV (or one UV and one OV). It may also monitor a single supply (positive or negative) for both UV and OV. Tables 2a and 2b show example configurations for monitoring possible combinations of fault condition and supply polarity. ADJ1 ADJ2 SEL 5V (UV) 15V (UV) RP2B 1.15M RP1B 137k RP1A 115k RP2A 3.09M REF SEL = VCC 2 Positive UV ADJ1 ADJ2 SEL 5V (OV) 15V (OV) RP2B 1.33M RP1B 137k RP1A 200k RP2A 6.19M REF 2 Positive OV ADJ1 ADJ2 SEL –5V (UV) –15V (UV) RN2B 1.37M RN1B 133k RN1A 107k RN2A 3.09M REF 2 Negative UV SEL = GND ADJ1 ADJ2 SEL –5V (OV) –15V (OV) RN2B 1.37M RN1B 118k RN1A 309k RN2A 10.2M REF 2 Negative OV ADJ1 ADJ2 SEL –15V (OV) 15V (UV) RN2 10.2M RN1 309k RP1 115k RP2 3.09M REF 1 Positive UV, 1 Negative OV ADJ1 ADJ2 SEL –15V (UV) 15V (OV) RN2 3.09M RN1 107k RP1 200k RP2 6.19M REF 1 Positive OV, 1 Negative UV Table 2a. Possible Combinations of Supply Monitoring. For Example Purposes, All Supplies are Monitored at 5% Tolerance and Connections are Shown Only for ADJ1, ADJ2, REF, SEL |
Similar Part No. - LTC2909CTS8-3.3 |
|
Similar Description - LTC2909CTS8-3.3 |
|
|
Link URL |
Privacy Policy |
ALLDATASHEET.COM |
Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Datasheet Upload | Contact us | Privacy Policy | Link Exchange | Manufacturer List 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 |