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LM2585S-12-LM2585S-5.0-LM2585S-ADJ-LM2585S-ADJ.-LM2585SX-12-LM2585SX-ADJ-LM2585T-5.0-LM2585T-ADJ
SIMPLE SWITCHER 3-Amp Flyback Regulator
LM2585
SIMPLE SWITCHER® 3A Flyback Regulator
General DescriptionThe LM2585 seriesof regulators are monolithic integrated
circuits specifically designedfor flyback, step-up (boost), and
forward converter applications. The deviceis availablein4
different output voltage versions: 3.3V, 5.0V, 12V, and ad-
justable.
Requiringa minimum numberof external components, these
regulators are cost effective, and simpleto use. Includedin
the datasheet are typical circuitsof boost and flyback regu-
lators. Also listed are selector guidesfor diodes and capaci-
tors anda familyof standard inductors and flyback trans-
formers designedto work with these switching regulators.
The power switchisa 3.0A NPN device that can stand-off
65V. Protecting the power switch are current and thermal
limiting circuits, andan undervoltage lockout circuit. ThisIC
containsa 100 kHz fixed-frequency internal oscillator that
permits the useof small magnetics. Other features include
soft start modeto reduce in-rush current during start up,
current mode controlfor improved rejectionof input voltage
and output load transients and cycle-by-cycle current limit-
ing.An output voltage toleranceof ±4%, within specified
input voltages and output load conditions,is guaranteedfor
the power supply system.
Features Requires few external components Familyof standard inductors and transformers NPN output switches 3.0A, can standoff 65V Wide input voltage range:4Vto 40V Current-mode operationfor improved transient
response, line regulation, and current limit 100 kHz switching frequency Internal soft-start function reduces in-rush current during
start-up Output transistor protectedby current limit, under
voltage lockout, and thermal shutdown System Output Voltage Toleranceof ±4% max over line
and load conditions
Typical Applications Flyback regulator Multiple-output regulator Simple boost regulator Forward converter
Flyback Regulator
Ordering Information
Package Type NSC Package Order Number
Drawing5-Lead TO-220 Bent, Staggered Leads T05D LM2585T-3.3, LM2585T-5.0, LM2585T-12, LM2585T-ADJ
5-Lead TO-263 TS5B LM2585S-3.3, LM2585S-5.0, LM2585S-12, LM2585S-ADJ
5-Lead TO-263 Tape and Reel TS5B LM2585SX-3.3, LM2585SX-5.0, LM2585SX-12,
DS012515-1
April 2000
LM2585
SIMPLE
SWITCHER
Flyback
Regulator
