LM3881 datasheet(9/17 Pages) TI

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Tenable delay

1.22V

Tenable_delay =

1.22V x CEN

7 PA

Enable

CEN

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

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Product Folder Links: LM3881

Manufacturer	Part #	Datasheet	Description
National Semiconductor ...	LM3881	243Kb / 14P	Power Sequencer
Texas Instruments	LM3881	791Kb / 17P	[Old version datasheet] LM3881 Power Sequencer
	LM3881	790Kb / 17P	[Old version datasheet] Power Sequencer
	LM3881	1Mb / 27P	[Old version datasheet] LM3881 Simple Power Sequencer With Adjustable Timing
National Semiconductor ...	LM3881MM	243Kb / 14P	Power Sequencer

Manufacturer	Part #	Datasheet	Description
Texas Instruments	LM3881MM-NOPB	791Kb / 17P	[Old version datasheet] LM3881 Power Sequencer
	LM3881	1Mb / 27P	[Old version datasheet] LM3881 Simple Power Sequencer With Adjustable Timing
	LM3881	790Kb / 17P	[Old version datasheet] Power Sequencer
National Semiconductor ...	LM3880	283Kb / 12P	Power Sequencer
	LM3881	243Kb / 14P	Power Sequencer
	LM3880	611Kb / 20P	Power Sequencer
Texas Instruments	LM3880	844Kb / 20P	[Old version datasheet] Power Sequencer
ABLIC Inc.	S-77100	2Mb / 40P	POWER SEQUENCER Rev.1.0_02
Seiko Instruments Inc	S-77100	4Mb / 40P	POWER SEQUENCER
Texas Instruments	LM3880	1Mb / 29P	[Old version datasheet] Simple Power Sequencer

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