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