AC-DC quasi-Resonant current mode PWM controller
Product details
Parameters
Package | Pins | Size
Features
- Critical Conduction Mode
- Peak-Current Mode Control
- Skip-Cycle Mode for Low-Standby Power
- Hiccup Mode for Continuous Overload Protection
- Cycle-by-Cycle Overcurrent Protection Maintains
Accuracy Over the Universal AC Line - Line-Voltage Feedforward
- OVP Protection by Sensing the Auxiliary Winding
- Integrated 0.7-A Peak Gate Driver
- Direct Opto-Coupler Interface
- Leading Edge Blanking of Current Sense Signal
- Maximum Frequency Clamp 130 kHz
- Programmable Soft-Start
- Thermal Shutdown
- 8-Pin VSSOP Package
Description
The LM5023 is a quasi-resonant pulse width modulated (PWM) controller which contains all of the features needed to implement a highly efficient off-line power supply. The LM5023 uses the transformer auxiliary winding for demagnetization detection to ensure critical conduction mode (CrCM) operation. The LM5023 features a hiccup mode for overcurrent protection with an auto restart to reduce the stress on the power components during an overload. A skip-cycle mode reduces power consumption at light loads for energy conservation applications (ENERGY STAR®, CEPCP, and so forth). The LM5023 also uses the transformer auxiliary winding for output overvoltage protection (OVP); if an OVP fault is detected the LM5023 latches off the controller.
Technical documentation
| Type | Title | Date | |
|---|---|---|---|
| * | Data sheet | LM5023 AC-DC Quasi-Resonant Current Mode PWM Controller datasheet (Rev. E) | Jan. 06, 2016 |
| White paper | Power Electronics in Motor Drives: Where is it? (Rev. A) | Oct. 01, 2019 | |
| Selection guide | Power Management Guide 2018 (Rev. R) | Jun. 25, 2018 | |
| User guide | Using the UCC24630EVM-636 65-W AC-to-DC Adapter (Rev. B) | Dec. 12, 2016 | |
| More literature | Design review of a 2-kW parallelable power supply module | Aug. 17, 2016 | |
| More literature | Design review of a 2-kW parallelable power supply module (PPT) | Aug. 17, 2016 | |
| More literature | Exposing the Inner Behavior of a Quasi-Resonant Flyback Converter | Oct. 29, 2013 | |
| User guide | PMP8655 Test Results | Oct. 11, 2013 | |
| Technical article | Isolated power supplies – Is analog dead? | Sep. 24, 2013 | |
| Technical article | APEC - hot and cool | Mar. 20, 2013 | |
| Application note | LM5023-2EVM Notebook Adapter | Feb. 12, 2013 | |
| More literature | LM5023 Product Bulletin | Feb. 08, 2013 |
Design & development
For additional terms or required resources, click any title below to view the detail page where available.Hardware development
Description
The Texas Instruments LM5023-2NBEVM evaluation module (EVM) is a fully assembled and tested circuit for evaluating the LM5023 AC-DC Quasi-Resonant Current Mode PWM Controller. This is a 65W evaluation modules for off-line notebook adapter applications.
Features
- Standby power <30mW
- Output voltage regulation <1%
- Efficiency >88%
Description
This is a high efficiency 65W AC/DC design using UCC24630 Synchronous Rectification Controller for a Universal input (85Vac to 265Vac) to 19.5V @3.33A output exceeding CoC-5 Tier2 and DOE Level VI performance requirements for external power supplies.
Features
- 91.49% @115V AC, 89.81% @230V AC 4-point average efficiency
- 83.14% @120V AC, 82.24% @230V AC 10% load efficiency
- 59mW No load Power consumption at 230V AC
- Fast turn-on time
- <80mV output voltage ripple
- AC line input UVLO protection
Description
The UCC28740EVM-525 evaluation module is a 10W off-line discontinuous mode (DCM) flyback converter that provides constant-voltage (CV) and constant-current (CC) output regulation. It uses optical coupler feedback for tight voltage regulation and improved the transient response to large load steps (...)
Features
- Universal AC input, 5V/2.1A output
- <20mW no load power
- Avg. efficiency > 80%
- Opto-Coupled Feedback for Constant Voltage Regulation and Fast Dynamic Response
- Primary Side Control for Tight Constant Current Performance (± 5% Output Current Regulation)
- Internal 700V Start-Up Switch to Start up the Supply (...)
Design tools & simulation
Reference designs
CAD/CAE symbols
| Package | Pins | Download |
|---|---|---|
| VSSOP (DGK) | 8 | View options |
Ordering & quality
- RoHS
- REACH
- Device marking
- Lead finish/Ball material
- MSL rating/Peak reflow
- MTBF/FIT estimates
- Material content
- Qualification summary
- Ongoing reliability monitoring
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