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LTC2909IDDB-5 Datasheet(PDF) 10 Page - Linear Technology |
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LTC2909IDDB-5 Datasheet(HTML) 10 Page - Linear Technology |
10 / 16 page LTC2909 10 2909fa APPLICATIO S I FOR ATIO Adjust Input Trip Point The trip threshold for the supplies monitored by the adjust- able inputs is set with an external resistor divider, allowing the user complete control over the trip point. Selection of this trip voltage is crucial to the reliability of the system. Any power supply has some tolerance band within which it is expected to operate (e.g., 5V ±10%). It is generally undesirable that a supervisor issue a reset when the power supply is inside this tolerance band. Such a “nuisance” reset reduces reliability by preventing the system from functioning under normal conditions. To prevent nuisance resets, the supervisor threshold must be guaranteed to lie outside the power supply tolerance Table 2b. 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 ADJ1 ADJ2 SEL 15V (UV/OV) RP6 2.37M RP5 10.7k RP4 76.8k REF SEL OPEN 1 Positive UV and OV ADJ1 ADJ2 SEL 5V (OV) 15V (UV) RP2B 1.33M RP1B 137k RP1A 115k RP2A 3.09M REF 1 Positive UV, 1 Positive OV 1 Negative OV, 1 Positive OV ADJ1 ADJ2 SEL –15V (UV/OV) RN6 10.2M RN4 309k RN5 40.2k REF 1 Negative UV and OV ADJ1 ADJ2 SEL 15V (OV) –15V (OV) RP2 6.19M RP1 200k RN1 309k RN2 10.2M REF ADJ1 ADJ2 SEL –5V (UV) –15V (OV) RN2B 1.37M RN1B 133k RN1A 309k RN2A 10.2M REF ADJ1 ADJ2 SEL –15V (UV) 15V (UV) RN2 3.09M RN1 107k RP1 115k RP2 3.09M REF 1 Positive UV, 1 Negative UV 1 Negative UV, 1 Negative OV band. To ensure that the threshold lies outside the power supply tolerance range, the nominal threshold must lie out- side that range by the monitor’s accuracy specification. All three of the LTC2909 inputs (ADJ1, ADJ2, VCC UVLO) have the same relative threshold accuracy of ±1.5% of the programmed nominal input voltage (over the full operating temperature range). Therefore, using the LTC2909, the typical 10% UV threshold is at 11.5% below the nominal input voltage level. For a 5V input, the threshold is nominally 4.425V. With ±1.5% accuracy, the trip threshold range is 4.425V ±75mV over temperature (i.e., 10% to 13% below 5V). The monitored system must thus operate reliably down to 4.35V or 13% below 5V over temperature. |
Similar Part No. - LTC2909IDDB-5 |
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Similar Description - LTC2909IDDB-5 |
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