LM5023 Texas instruments

LM5023

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LM5023

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Описание

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.

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

Control mode	Secondary-side regulation
UVLO thresholds on/off (V)	12.8/7.5
Duty cycle (max) (%)	100
Switching frequency (max) (kHz)	130
Features	CCM, Green mode, Leading edge blanking, Light-load efficiency, Overvoltage protection, Quasi resonant, SSR
Operating temperature range (°C)	-40 to 125
Rating	Catalog
Device type	Controllers
Topology	Flyback