LM2586SX-ADJ/NOPB

The LM2586 series of regulators are monolithic
integrated circuits specifically designed for flyback,
step-up (boost), and forward converter applications.
The device is available in 4 different output voltage
versions: 3.3 V, 5 V, 12 V, and adjustable.
Requiring a minimum number of external
components, these regulators are cost effective, and
simple to use. Included in the datasheet are typical
circuits of boost and flyback regulators. Also listed
are selector guides for diodes and capacitors and a
family of standard inductors and flyback transformers
designed to work with these switching regulators.
The power switch is a 3-A NPN device that can
stand-off 65 V. Protecting the power switch are
current and thermal limiting circuits, and an
undervoltage lockout circuit. This IC contains an
adjustable frequency oscillator that can be
programmed up to 200 kHz. The oscillator can also
be synchronized with other devices, so that multiple
devices can operate at the same switching frequency.
Other features include soft start mode to reduce in-
rush current during start up, and current mode control
for improved rejection of input voltage and output
load transients and cycle-by-cycle current limiting.
The device also has a shutdown pin, so that it can be
turned off externally. An output voltage tolerance of
±4%, within specified input voltages and output load
conditions, is ensured for the power supply system.