Overview
The MC33262CDR2 is an active power factor correction (PFC) controller designed by onsemi for use in electronic ballast and off-line power converter applications. This integrated circuit is part of the MC34262/MC33262 series, which features advanced functionalities to enhance power factor correction in various power supply systems.
Key highlights include an internal startup timer for stand-alone applications, a one quadrant multiplier for achieving near unity power factor, a zero current detector for critical conduction operation, and a transconductance error amplifier. The device also includes a quickstart circuit to enhance startup performance and a trimmed internal bandgap reference for precision voltage regulation.
Key Specifications
| Characteristic | Symbol | Value | 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 to +10 | V |
| Zero Current Detect Input High State Forward Current / Low State Reverse Current | Iin | 50 / -10 | mA |
| Maximum Power Dissipation @ TA = 70°C (P Suffix, Plastic Package) | PD | 800 | mW |
| Thermal Resistance, Junction-to-Air (P Suffix, Plastic Package) | RJA | 100 | °C/W |
| Operating Junction Temperature | TJ | +150 | °C |
| Operating Ambient Temperature | TA | -40 to +105 | °C |
| Transconductance (TA = 25°C) | gm | 80 to 130 | μmho |
| Output Voltage Swing High State / Low State | VOH(ea) / VOL(ea) | 5.8-6.4 / 1.7-2.4 | V |
Key Features
- Internal Startup Timer: For stand-alone applications.
- One Quadrant Multiplier: Achieves near unity power factor.
- Zero Current Detector: Ensures critical conduction operation.
- Transconductance Error Amplifier: High output impedance with controlled voltage-to-current gain.
- Quickstart Circuit: Enhances startup performance by precharging the compensation capacitor.
- Trimmed Internal Bandgap Reference: Provides precise voltage regulation.
- Current Sensing Comparator: Monitors and controls the current sense loop.
- Totem Pole Output: Ideally suited for driving power MOSFETs with high state clamp for MOSFET gate protection.
- Protective Features: Overvoltage comparator, input undervoltage lockout with hysteresis, cycle-by-cycle current limiting, and multiplier output clamp.
Applications
- Electronic Ballast: Used in lighting systems to improve power factor and efficiency.
- Off-Line Power Converters: Enhances power factor correction in off-line power supply systems.
- Active Power Factor Correction Preconverters: Improves the power factor of the input current, making it sinusoidal and in phase with the line voltage.
Q & A
- What is the primary function of the MC33262CDR2?
The MC33262CDR2 is an active power factor correction controller designed to improve the power factor in electronic ballast and off-line power converter applications.
- What are the key components of the MC33262CDR2?
The device includes an internal startup timer, one quadrant multiplier, zero current detector, transconductance error amplifier, quickstart circuit, trimmed internal bandgap reference, and a totem pole output.
- What is the purpose of the zero current detector in the MC33262CDR2?
The zero current detector ensures critical conduction operation by initiating the next on-time when the inductor current reaches zero.
- How does the quickstart circuit enhance startup performance?
The quickstart circuit precharges the compensation capacitor to a level slightly below the multiplier threshold, allowing immediate drive output switching and bootstrap operation.
- What are the protective features included in the MC33262CDR2?
The device includes an overvoltage comparator, input undervoltage lockout with hysteresis, cycle-by-cycle current limiting, and a multiplier output clamp.
- What is the maximum output current of the MC33262CDR2?
The maximum output current is 500 mA.
- What is the operating ambient temperature range for the MC33262CDR2?
The operating ambient temperature range is -40°C to +105°C.
- What type of output stage does the MC33262CDR2 have?
The device has a single totem-pole output stage specifically designed for direct drive of power MOSFETs.
- How does the transconductance error amplifier function?
The transconductance error amplifier has high output impedance with controlled voltage-to-current gain, featuring a typical transconductance of 100 μmhos.
- What are the typical applications of the MC33262CDR2?
The device is typically used in electronic ballast, off-line power converters, and active power factor correction preconverters.
