MC34023 onsemi PWM Controller Data Sheet

Description

This PDF datasheet is for the onsemi MC34023 PWM Controller.

onsemi MC34023 High Speed Single-Ended PWM Controller

The MC33023 and MC34023 series are high speed, fixed frequency, single-ended pulse width modulator controllers optimized for high frequency operation. They are specifically designed for Off-Line and DC-to-DC converter applications offering the designer a cost effective solution with minimal external components.
These integrated circuits feature an oscillator, a temperature compensated reference, a wide bandwidth error amplifier, a high speed current sensing comparator, and a high current totem pole output ideally suited for driving a power MOSFET.
Also included are protective features consisting of input and reference undervoltage lockouts each with hysteresis, cycle-by-cycle current limiting, and a latch for single pulse metering. The flexibility of this series allows it to be easily configured for either current mode or voltage mode control.

(PDF) DATASHEET (ENGLISH)

CONTENTS

– Features
– Marking Diagrams
– Pin Connections
– Ordering Information
– Ordering Information
– Maximum Ratings
– Maximum Power Supply Voltage
– Maximum Output Driver Supply Voltage
– Maximum Output Current, Source or Sink
– Maximum Current Sense, Soft-Start, Ramp, and Error Amp Inputs
– Maximum Power Dissipation
– Maximum Operating Junction Temperature
– Maximum Operating Ambient Temperature
– Storage Temperature Range
– Electrical Characteristics: Reference Section, Oscillator Section, Error Amplifier Section, PWM Comparator Section, Soft-Start Section, Current Sense Section, Output Section, Undervoltage Lockout Section, Total Device

Figure 2. Timing Resistor versus Oscillator Frequency
Figure 3. Oscillator Frequency versus Temperature
Figure 4. Error Amp Open Loop Gain and Phase versus Frequency
Figure 5. PWM Comparator Zero Duty Cycle Threshold Voltage versus Temperature
Figure 6. Error Amp Small Signal Transient Response
Figure 7. Error Amp Large Signal Transient Response
Figure 8. Reference Voltage Change versus Source Current
Figure 9. Reference Short Circuit Current versus Temperature
Figure 10. Reference Line Regulation
Figure 11. Reference Load Regulation
Figure 12. Current Limit Comparator Input Offset Voltage versus Temperature
Figure 13. Shutdown Comparator Threshold Voltage versus Temperature
Figure 14. Soft-Start Charge Current versus Temperature
Figure 15. Output Saturation Voltage versus Load Current
Figure 16. Drive Output Rise and Fall Time
Figure 17. Drive Output Rise and Fall Time
Figure 18. Supply Voltage versus Supply Current
Figure 19. Representative Block Diagram
Figure 20. Current Limit Operating Waveforms

– Operating Description
– Pin Function Description

Figure 21. Ramp Compensation
Figure 22. Voltage Mode Operation
Figure 23. Current Mode Operation
Figure 24. Resistive Current Sensing
Figure 25. Primary Side Current Sensing
Figure 26A. Slope Compensation (Noise Sensitive)
Figure 26B. Slope Compensation (Noise Immune)
Figure 27. Dead Time Addition
Figure 28. External Clock Synchronization
Figure 29. Current Mode Master/Slave Operation Over Short Distances
Figure 30. Synchronization Over Long Distances
Figure 31. Buffered Maximum Clamp Level
Figure 32. Bipolar Transistor Drive
Figure 33. MOSFET Parasitic Oscillations
Figure 34. Isolated MOSFET Drive
Figure 35. Application Circuit
Figure 36. PC Board With Components
Figure 37. PC Board Without Components

– Package Dimensions

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