LM5023_16 Datasheet, PDF (1/38 Pages) Texas Instruments – AC-DC Quasi-Resonant Current Mode PWM Controller

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LM5023
SNVS961E – APRIL 2013 – REVISED JANUARY 2016
LM5023 AC-DC Quasi-Resonant Current Mode PWM Controller
1 Features
•1 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
2 Applications
• Universal Input AC-to-DC Notebook Adapters
from 10 W to 65 W
• High-Efficiency Housekeeping and Auxiliary
Power Supplies
• Battery Chargers
• Consumer Electronics (DVD Players, Set-Top
Boxes, DTV, Gaming, Printers)
3 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.
Device Information⁽¹⁾
PART NUMBER
PACKAGE
BODY SIZE (NOM)
LM5023
VSSOP (8)
3.00 mm × 3.00 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
Simplified Schematic
VOUT
19 V
VAC
High
Voltage
Start-Up
Depletion
1
Mode FET
QR
OUT 7
8 VCC
5
CS
LM5023
2 VSD
COMP 4
3 SS _GND
Output
Voltage
Regulation
6
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.