4-V to 40-V, 3-A step-up wide VIN flyback regulator
Product details
Parameters
Package | Pins | Size
Features
- Requires Few External Components
- Family of Standard Inductors and Transformers
- NPN Output Switches 3 A, Can Stand Off 65 V
- Wide Input Voltage Range: 4 V to 40 V
- Current-mode Operation for 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 Protected by Current Limit, Undervoltage Lockout, and Thermal Shutdown
- System Output Voltage Tolerance of ±4% Maximum Over Line and Load Conditions
- Create a Custom Design Using the LM2585 With the WEBENCH® Power Designer
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Description
The LM2585 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 a 100-kHz fixed-frequency internal oscillator that permits the use of small magnetics. Other features include soft start mode to reduce in-rush current during start-up, current mode control for improved rejection of input voltage and output load transients and cycle-by-cycle current limiting. An output voltage tolerance of ±4%, within specified input voltages and output load conditions, is specified for the power supply system.
Technical documentation
Design & development
For additional terms or required resources, click any title below to view the detail page where available.Design tools & simulation
Features
- Leverages Cadence PSpice Technology
- Preinstalled library with a suite of digital models to enable worst-case timing analysis
- Dynamic updates ensure you have access to most current device models
- Optimized for simulation speed without loss of accuracy
- Supports simultaneous analysis of multiple products
- (...)
Features
- Features isolated topologies like Fly-Buck™, Fly-Buck-Boost, DCM and CCM Flyback
- Capability to design up to 6 isolated outputs
- Recommends ICs for desired application design
- Incorporates loop compensation in designs
- Compares efficiency, external component count and transformer currents for every topology (...)
CAD/CAE symbols
Package | Pins | Download |
---|---|---|
DDPAK/TO-263 (KTT) | 5 | View options |
TO-220 (NDH) | 5 | View options |
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