LM5020 Datasheet | National Semiconductor

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 pensation while providing inherent line feed-forward. The LM5020 includes a highvoltage 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 pensation, softstart, oscillator synchronization capability and thermal shutdown. The controller is available in both MSOP-10 and LLP-10 packages. Features n n n n n n n n n n n n 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 pensation (LM5020-1) Programmable Oscillator Frequency with Synchronization Capability Current Sense Leading Edge Blanking Thermal Shutdown Protection Packages n MSOP-10 n LLP-10 (4 mm x 4 mm) Connection Diagram Top View 10-Lead MSOP, LLP Ordering Information Order Number LM5020MM-1 LM5020MMX-1 LM5020SD-1 LM5020SDX-1 LM5020MM-2 LM5020MMX-2 LM5020SD-2 LM5020SDX-2 Description MSOP, 80% Duty Cycle Limit MSOP, 80% Duty Cycle Limit LLP, 80% Duty Cycle Limit LLP, 80% Duty Cycle Limit MSOP, 50% Duty Cycle Limit MSOP, 50% Duty Cycle Limit LLP, 50% Duty Cycle Limit LLP, 50% Duty Cycle Limit NSC Package Drawing MUB-10A MUB-10A SDC-10A SDC-10A MUB-10A MUB-10A SDC-10A SDC-10A Supplied As 1000 Units on Tape and Reel 3500 Units on Tape and Reel 1000 Units on Tape and Reel 4500 Units on Tape and...