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LM3881MM Datasheet(PDF) 9 Page - Texas Instruments

No. de pieza LM3881MM
Descripción Electrónicos  LM3881 Power Sequencer
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LM3881MM Datasheet(HTML) 9 Page - Texas Instruments

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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
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