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Overview
| Topology | Buck Converter |
| Input voltage | 90-265 V |
| Output 1 | 19.5 V / 3.33 A |
| IC revision | D |
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 (CCM) operation. The LM5023 features a hiccup mode for over current protection with an auto restart to reduce the stress on the power components during an overload. A skip cycle mode which reduces power consumption at light loads for energy conservation applications (ENERGY STAR®, CEPCP, etc.). The LM5023 also uses the transformer auxiliary winding for output overvoltage (OVP) protection, if an OVP fault is detected the LM5023 latches off the controller.
Features
- Critical Conduction Mode
- Peak Current Mode Control Mode
- Skip Cycle Mode for Low Standby Power
- Hiccup Mode for Continuous Overload Protection
- Cycle-by-Cycle Over-Current Protection MaintainsAccuracy over the Universal AC Line
- Line Current Feed Forward
- OVP Protection by Sensing the Aux 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 MSOP Package
Typical applications
- Consumer Electronics
- Universal Input AC-DC Notebook Adapters 10 W to 65 W
- High Efficiency Housekeeping and Auxiliary Power
- Battery Chargers
More information
Products
Order Code | Datasheet | Simulation | Downloads | Status | Product series | IRP,40K(A) | ISAT,10%(A) | ISAT,30%(A) | RDC(mΩ) | IR(A) | L(µH) | RDC max.(mΩ) | VR(V (AC)) | VT(V (AC)) | Material | L(mm) | W(mm) | H(mm) | Mount | L1(µH) | L2(µH) | IR(A) | IR 2(A) | ISAT(A) | RDC1 typ(Ω) | RDC2 typ(Ω) | RDC1 max(Ω) | RDC2 max(Ω) | fres(MHz) | Type | Samples | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
 | WE-HCI SMT Flat Wire High Current Inductor, 23.8 A, 7 A | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-HCI SMT Flat Wire High Current Inductor | Performance Rated Current23.8 A | Saturation Current @ 10%7 A | Saturation Current @ 30%17 A | DC Resistance3.7 mΩ | – | Inductance2.3 µH | DC Resistance3.96 mΩ | – | – | MaterialWE-PERM | Length13 mm | Width12.8 mm | Height4.7 mm | MountSMT | – | – | – | – | – | – | – | – | – | Self Resonant Frequency40 MHz | – | ||||
 | WE-CMB Common Mode Power Line Choke, –, – | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-CMB Common Mode Power Line Choke | – | – | – | – | Rated Current12 A | Inductance1000 µH | DC Resistance9 mΩ | Rated Voltage250 V (AC) | Insulation Test Voltage1500 V (AC) | MaterialMnZn | Length31 mm | Width22 mm | Height35 mm | MountTHT | – | – | – | – | – | – | – | – | – | – | – | ||||
 | WE-DD SMT Shielded Coupled Inductor, –, – | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-DD SMT Shielded Coupled Inductor | – | – | – | – | Rated Current1 A | Inductance10 µH | DC Resistance150 mΩ | – | – | – | Length7.3 mm | Width7.3 mm | Height4 mm | – | Inductance 110 µH | Inductance 210 µH | Rated Current1 A | Rated Current 21 A | Saturation Current2 A | DC Resistance 10.125 Ω | DC Resistance 20.125 Ω | DC Resistance 10.15 Ω | DC Resistance 20.15 Ω | Self Resonant Frequency30 MHz | TypeStraight | ||||
 | 750315092 | Offline Transformer, –, – | Downloads5 files | Status Activei| Production is active. Expected lifetime: >10 years. | Product series Offline Transformer | – | – | – | – | – | Inductance200 µH | – | – | Insulation Test Voltage2000 V (AC) | – | Length32.4 mm | Width40 mm | Height20.5 mm | MountTHT | Inductance 1200 µH | – | – | – | Saturation Current3.2 A | – | – | – | – | – | – |