L5991AD AC-DC Converters by STMicroelectronics

Current Mode PWM


This primary controller I.C., developed in BCD60II technology, has been designed to implement off line or DC-DC power supply applications using a fixed frequency current mode control. Based on a standard current mode PWM controller this device includes some features such as programmable soft start, IN/OUT synchronization, disable (to be used for over voltage protection and for power management), precise maximum Duty Cycle Control, 100ns leading edge blanking on current sense, pulse by pulse current limit, overcurrent protection with soft start intervention, and Standby function for oscillator frequency reduction when the converter is lightly loaded.

Where to Buy

Prices starting from US$1.27

Distributor Stock
Logo for Farnell
Farnell
from US$1.41
193
in stock
Buy Now
Logo for Newark Electronics
Newark Electronics
from US$1.83
193
in stock
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Logo for element14
element14
from US$1.37
193
in stock
Buy Now
Logo for Transfer Multisort Elektronik
Transfer Multisort Elektronik
from US$2.10
156
in stock
Buy Now
Logo for Avnet Silica
Avnet Silica
-
1,900
in stock
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Logo for Future Electronics
Future Electronics
from US$1.30
-
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Logo for Avnet America
Avnet America
from US$1.27
-
Buy Now
Logo for EBV Elektronik
EBV Elektronik
-
-
Buy Now

Features

PRIMARY OVERCURRENT FAULT DETECTION WITH RE-START DELAY
PROGRAMMABLE SOFT START
IN/OUT SYNCHRONIZATION
PWM UVLO WITH HYSTERESIS
INTERNAL 100ns LEADING EDGE BLANKING OF CURRENT SENSE
LATCHED DISABLE
PACKAGE: DIP16 AND SO16
100% AND 50% MAXIMUM DUTY CYCLE LIMIT
PROGRAMMABLE DUTY CYCLE
CURRENT-MODE CONTROL PWM
LOW START-UP CURRENT (< 120µA)
SWITCHING FREQUENCY UP TO 1MHz
FULLY LATCHED PWM LOGIC WITH DOUBLE PULSE SUPPRESSION
STANDBY FUNCTION
HIGH-CURRENT OUTPUT DRIVE SUITABLE FOR POWER MOSFET (1A)

Resources


Application Notes
AN1620 25W off-line autoranging battery charger with L5991A
AN2439 27W Output power ultra wide range input flyback converter
AN1621 300W secondary controlled two-switch forward converter with L5991A
AN1134 45W AC-DC adapter with standby function
AN1842 60W WIDE-RANGE POWER SUPPLY FOR LCD MONITOR OR TV, USING THE L5991
AN1132 90W SMPS for monitors with standby function
AN1537 A simple trick enhances L5991’s standby function
AN1686 AN L5991-based converter with temporary extra power capability
AN2623 Evaluation board for off-line forward converter based on L5991
AN2131 HIGH POWER 3-PHASE AUXILIARY POWER SUPPLY DESIGN BASED ON L5991 AND ESBT STC08DE150
AN1215 How to handle short circuit conditions with ST's advanced PWM controllers
AN1049 Minimize power losses of lightly loaded flyback converters with the L5991 PWM controller




Alternative Descriptions

Supply Voltage Min:- | Newark Electronics
PWM CONT, CURRENT MODE, 1MHZ, SOIC-16 | element14
IC: driver | Transfer Multisort Elektronik
Current Mode PWM Controller 1.5A 16-Pin SO Tube | Avnet Silica
SO 16 .15 TO JEDEC MS-012 | Future Electronics


Frequently Asked Questions

Where can I find additional details, specifications and documents for a L5991AD?

Additional datasheets, footprints and schematics for L5991AD are listed on our Part Details page. You can also find images and similar parts to L5991AD on this page.

What pricing and inventory information can I view?

Distributor pricing and stock information is available for L5991AD on our Product Comparison page. Access via the 'View Pricing & Stock' button to view L5991AD price breaks, MOQs, lead times, inventory and SKUs from distributors.

What category does L5991AD fall under?

The L5991AD is listed under Power Management > AC-DC Converters > PWM Controllers.

Can I view similar or alternative parts?

You can view similar parts to L5991AD when available in the PWM Controllers range under the specifications section at the bottom of the details page.

Who can I contact for technical support of the product?

Submit any questions directly to the customer support team of the distributor listing the product. For the L5991AD you can contact the distributor directly for product support, shipping queries etc.

Is the L5991AD RoHS compliant?

Yes. This part has been flagged as RoHS Compliant by STMicroelectronics.

Which authorised distributors for L5991AD have stock available?

Authorised distributors including Newark Electronics, element14, Farnell, Transfer Multisort Elektronik and Avnet Silica have stock available or on a lead time for L5991AD.

How do I check stock and lead times for all distributors?

Stock availability and lead times will be displayed for L5991AD often in real-time on the comparison pages.

What if I can't find stock of L5991AD?

You can fill out our help required form which you can use to request a quote for L5991AD from some of our verified obsolescence suppliers. Alternatively, contact us via our web chat in the bottom left of your screen and one of our team will try to help.

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