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LM3881MM Datasheet(PDF) 9 Page - Texas Instruments |
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LM3881MM Datasheet(HTML) 9 Page - Texas Instruments |
9 / 17 page EN Tenable delay 0V 1.22V Tenable_delay = 1.22V x CEN 7 PA 7 PA Enable CEN EN + - 1.22V LM3881 www.ti.com SNVS555C – JANUARY 2008 – REVISED APRIL 2013 ENABLE CIRCUIT The enable circuit is designed with an internal comparator, referenced to a bandgap voltage (1.22V), to provide a precision threshold. This allows the timing to be set externally using a capacitor as shown in the diagram below. Alternatively, sequencing can be based on a certain event such as a line voltage reaching 90% of its nominal value by employing a resistor divider from VCC to Enable. Figure 14. Precision Enable Circuit Using the internal pull-up current source to charge the external capacitor CEN, the time delay while the enable voltage reaches the required threshold, assuming EN is charging from 0V, can be calculated by the equation as follows. Figure 15. Enable Delay Timing Copyright © 2008–2013, Texas Instruments Incorporated Submit Documentation Feedback 9 Product Folder Links: LM3881 |
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