CD5020,LM5020 PWM Controller Chip

The CD5020 high voltage pulse-width-modulation(PWM) controller contains all of the featuresneeded to implement single ended primary powerconverter topologies. Output voltage regulation isbased on current-mode control, which eases thedesign of loop compensation.The CD5020 includes a high-voltage start-upregulator that operates over a wide input range upto 100V. The PWM controller is designed for highspeed capability including an oscillator frequencyrange to 1MHz and total propagation delays lessthan 100ns. Additional features include an erroramplifier, precision reference, line under-voltagelockout, cycle-by-cycle current limit, slopecompensation, soft-start, oscillator synchronizationcapability and thermal shutdown.

Internal High Voltage Start-Up Bias Regulator

Error Amplifier

High Precision Voltage Reference

Programmable Soft-Start

1A Peak Gate Drive

Maximum Duty Cycle Limiting - 80% Programmable Line Under Voltage Lockout

(UVLO) with Adjustable Hysteresis Cycle-by-Cycle Over-Current Protection Slope Compensation

Programmable Oscillator Frequency with Synchronization Capability

Current Sense Leading Edge Blanking

Thermal Shutdown Protection

Packages: VSSOP10