LM5020MM-1 Datasheet, PDF (1/17 Pages) Texas Instruments – LM5020 100V Current Mode PWM Controller

LM5020
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SNVS275F – MAY 2004 – REVISED APRIL 2006
LM5020 100V Current Mode PWM Controller
Check for Samples: LM5020
FEATURES
1
•2 Internal Start-up Bias Regulator
• Error Amplifier
• Precision Voltage Reference
• Programmable Softstart
• 1A Peak Gate Driver
• Maximum Duty Cycle Limiting (80% for
LM5020-1 or 50% for LM5020-2)
• Programmable Line Under Voltage Lockout
(UVLO) with Adjustable Hysteresis
• Cycle-by-Cycle Over-Current Protection
• Slope Compensation (LM5020-1)
• Programmable Oscillator Frequency with
Synchronization Capability
• Current Sense Leading Edge Blanking
• Thermal Shutdown Protection
APPLICATIONS
• Telecommunication Power Converters
• Industrial Power Converters
• +42V Automotive Systems
PACKAGES
• VSSOP-10
• WSON-10 (4 mm x 4 mm)
DESCRIPTION
The LM5020 high voltage pulse-width-modulation
(PWM) controller contains all of the features needed
to implement single ended primary power converter
topologies. Output voltage regulation is based on
current-mode control, which eases the design of loop
compensation while providing inherent line feed-
forward. The LM5020 includes a high-voltage start-up
regulator that operates over a wide input range up to
100V. The PWM controller is designed for high speed
capability including an oscillator frequency range to
1MHz and total propagation delays less than 100ns.
Additional features include an error amplifier,
precision reference, line under-voltage lockout, cycle-
by-cycle current limit, slope compensation, softstart,
oscillator synchronization capability and thermal
shutdown. The controller is available in both VSSOP-
10 and WSON-10 packages.
Typical Application Circuit
V_IN
VIN
VCC
LM5020
UVLO
V_OUT
SS
RT/SYNC
GND
OUT
CS
FB
COMP
COMPENSATION
Figure 1. Non-Isolated Flyback Converter
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2
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 © 2004–2006, Texas Instruments Incorporated