Overview
The MC33262DG is an active power factor correction (PFC) controller designed by onsemi. It is specifically intended for use as a preconverter in electronic ballast and off-line power converter applications. This integrated circuit features several key components, including an internal startup timer, a one quadrant multiplier for near unity power factor, a zero current detector for critical conduction operation, and a transconductance error amplifier. Additionally, it includes a quickstart circuit for enhanced startup and a trimmed internal bandgap reference. The device is equipped with protective features such as an overvoltage comparator, input undervoltage lockout with hysteresis, cycle-by-cycle current limiting, and a drive output high state clamp for MOSFET gate protection.
Key Specifications
| Characteristic | Symbol | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| Total Power Supply and Zener Current | ICC + IZ | - | - | 30 | mA |
| Output Current, Source or Sink | IO | - | - | 500 | mA |
| Current Sense, Multiplier, and Voltage Feedback Inputs | Vin | -1.0 | - | 10 | V |
| Operating Junction Temperature | TJ | - | - | 150 | °C |
| Operating Ambient Temperature | TA | -40 | - | 105 | °C |
| Startup Threshold (VCC Increasing) | Vth(on) | 11.5 | 13 | 14.5 | V |
| Minimum Operating Voltage After Turn-On (VCC Decreasing) | VShutdown | 7.0 | 8.0 | 9.0 | V |
| Undervoltage Lockout Hysteresis | VH | 3.8 | 5.0 | 6.2 | V |
| Power Supply Current (Startup) | ICC | - | 0.25 | - | mA |
| Power Supply Current (Operating) | ICC | - | 6.5 | - | mA |
| Package Type | - | - | - | SOIC-8 | - |
Key Features
- Active Power Factor Control: Designed to achieve near unity power factor in off-line power converter applications.
- Internal Startup Timer: Enables stand-alone operation without external components.
- One Quadrant Multiplier: Ensures sinusoidal line current and phase alignment with line voltage.
- Zero Current Detector: Ensures critical conduction operation.
- Transconductance Error Amplifier: Provides accurate voltage feedback.
- Quickstart Circuit: Enhances startup performance.
- Trimmed Internal Bandgap Reference: Offers a stable 2% internal reference voltage.
- Totem Pole Output with High State Clamp: Ideal for driving power MOSFETs with gate protection.
- Overvoltage Comparator: Prevents runaway output voltage due to load removal.
- Undervoltage Lockout with Hysteresis: Ensures stable operation and prevents false startups.
- Cycle-by-Cycle Current Limiting: Protects against overcurrent conditions.
- Low Startup and Operating Current: Minimizes power consumption.
Applications
- Electronic Ballast: Used in lighting systems to improve power factor and reduce harmonic distortion.
- Off-Line Power Converters: Enhances power factor in switch-mode power supplies and other off-line converter applications.
- High Efficiency Power Supplies: Suitable for designs requiring high power factor and efficiency).
Q & A
- What is the primary function of the MC33262DG?
The MC33262DG is an active power factor correction (PFC) controller designed to achieve near unity power factor in off-line power converter applications).
- What types of packages are available for the MC33262DG?
The device is available in dual-in-line (PDIP-8) and surface mount (SOIC-8) plastic packages).
- What is the purpose of the internal startup timer in the MC33262DG?
The internal startup timer enables stand-alone operation without the need for external components).
- How does the one quadrant multiplier contribute to the operation of the MC33262DG?
The one quadrant multiplier ensures that the line current is sinusoidal and in phase with the line voltage, achieving near unity power factor).
- What protective features does the MC33262DG include?
The device includes protective features such as an overvoltage comparator, input undervoltage lockout with hysteresis, cycle-by-cycle current limiting, and a drive output high state clamp for MOSFET gate protection).
- What is the operating ambient temperature range for the MC33262DG?
The operating ambient temperature range is from -40°C to +105°C).
- What is the maximum output current of the MC33262DG?
The maximum output current is 500 mA).
- How does the quickstart circuit enhance the startup performance of the MC33262DG?
The quickstart circuit helps in enhancing the startup performance by providing a rapid charge to the capacitor, thus speeding up the startup process).
- What is the purpose of the trimmed internal bandgap reference in the MC33262DG?
The trimmed internal bandgap reference provides a stable 2% internal reference voltage, ensuring consistent operation across various conditions).
- Is the MC33262DG Pb-free and halide-free?
Yes, the MC33262DG is Pb-free and halide-free).
