LM5023_15 Datasheet, PDF (1/33 Pages) Texas Instruments – AC-DC Quasi-Resonant Current Mode PWM Controller

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LM5023
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SNVS961D – APRIL 2013 – REVISED JANUARY 2014
AC-DC Quasi-Resonant Current Mode PWM Controller
FEATURES
1
• 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
Maintains Accuracy 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
APPLICATIONS
• Universal Input AC-DC Notebook Adapters 10
W to 65 W
• High Efficiency Housekeeping and Auxiliary
Power
• Battery Chargers
• Consumer Electronics (DVD Players, Set-Top
Boxes, DTV, Gaming, Printers, etc)
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.
SIMPLIFIED SCHEMATIC
Vout
+19V
90-264 VAC
High
Voltage
Start-up
Depletion
Mode
FET
VCC
QR
OUT
CS
LM5023
VSD
SS
COMP
GND
Output
voltage
regulation
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2013–2014, Texas Instruments Incorporated