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National Semiconductor LM2585 Simple Switcher 3A Flyback Regulator Datasheet
The LM2585 series are monolithic switching regulators designed for flyback, boost and forward converter topologies. The device is offered in four output‑voltage versions (3.3 V, 5.0 V, 12 V and adjustable) and requires only a few external components.
Key features include a 3 A NPN output switch that can stand off 65 V, a fixed 100 kHz oscillator, wide input range (4 V‑40 V), soft‑start, current‑mode control and a guaranteed +4 % output‑voltage tolerance.
National Semiconductor LM2585 specifications
| Output voltage versions | 3.3 V, 5.0 V, 12 V, adjustable |
|---|---|
| Maximum output switch current | 3.0 A (NPN) stand‑off 65 V |
| Switching frequency | 100 kHz |
| Input voltage range | 4 V to 40 V |
| Output voltage tolerance | +4 % max |
Source: National Semiconductor LM2585 Simple Switcher 3A Flyback Regulator Datasheet
All National Semiconductor LM2585 documents by type
Ratings, dimensions and ordering codes, for selection and design work.
Questions answered in these manuals
What is the fixed switching frequency of the LM2585?
The LM2585 operates at a fixed 100 kHz switching frequency.
From: National Semiconductor LM2585 Simple Switcher 3A Flyback Regulator Datasheet
What output‑voltage options are available for the LM2585?
The regulator is offered in 3.3 V, 5.0 V, 12 V and an adjustable version.
From: National Semiconductor LM2585 Simple Switcher 3A Flyback Regulator Datasheet
What is the switching frequency of the LM2585?
The LM2585 operates at a fixed 100 kHz switching frequency.
From: National Semiconductor LM2585 Simple Switcher 3A Flyback Regulator Datasheet
What is the maximum output current the device can handle?
The internal NPN power switch can handle up to 3 A while standing off 65 V.
From: National Semiconductor LM2585 Simple Switcher 3A Flyback Regulator Datasheet