Overview
The MC34262DR2G, produced by onsemi, is an active power factor controller specifically designed for use as a preconverter 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. It includes 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. The device also incorporates protective features such as an overvoltage comparator, input undervoltage lockout, and cycle-by-cycle current limiting, making it a robust solution for high-performance power supply systems.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Total Power Supply and Zener Current (ICC + IZ) | 30 | mA |
| Output Current, Source or Sink (IO) | 500 | mA |
| Input Threshold, Pin 2 (Vth(M)) | 1.05 | V |
| Maximum Current Sense Input Threshold (Vth(max)) | 1.3 to 1.8 | V |
| Output Voltage (VCC = 12 V), Low State (ISink = 20 mA) | 0.3 to 0.8 | V |
| Output Voltage (VCC = 12 V), High State (ISource = 20 mA) | 10.3 to 11.3 | V |
| Output Voltage Rise Time (CL = 1.0 nF) | 50 to 120 | ns |
| Operating Temperature Range | -40°C to +85°C (MC34262) | °C |
| Package Type | SOIC-8 (Pb-Free) |
Key Features
- Internal startup timer for stand-alone applications
- One quadrant multiplier for near unity power factor
- Zero current detector for critical conduction operation
- Transconductance error amplifier with high output impedance
- Quickstart circuit for enhanced startup
- Trimmed 2% internal bandgap reference
- Totem pole output ideally suited for driving a power MOSFET
- Overvoltage comparator to eliminate runaway output voltage
- Input undervoltage lockout with hysteresis
- Cycle-by-cycle current limiting
- Multiplier output clamp to limit maximum peak switch current
- RS latch for single pulse metering
- Drive output high state clamp for MOSFET gate protection
- Pb-Free packages available
Applications
The MC34262DR2G is designed for use in various high-performance power supply applications, including:
- Electronic ballast systems
- Off-line power converter applications
- Active power factor correction (PFC) preconverters
- High-frequency switching power supplies
Q & A
- What is the primary function of the MC34262DR2G?
The MC34262DR2G is an active power factor controller designed to improve power factor in electronic ballast and off-line power converter applications.
- What are the key features of the MC34262DR2G?
Key features include an internal startup timer, one quadrant multiplier, zero current detector, transconductance error amplifier, and various protective features such as overvoltage comparator and input undervoltage lockout.
- What is the operating temperature range of the MC34262DR2G?
The operating temperature range is -40°C to +85°C for the MC34262.
- What type of package is the MC34262DR2G available in?
The MC34262DR2G is available in an SOIC-8 (Pb-Free) package.
- What is the purpose of the overvoltage comparator in the MC34262DR2G?
The overvoltage comparator eliminates the possibility of runaway output voltage by terminating MOSFET switching when the peak output voltage exceeds a certain threshold.
- How does the zero current detector function in the MC34262DR2G?
The zero current detector initiates the next on-time by setting the RS latch at the instant the inductor current reaches zero, ensuring critical conduction mode operation.
- What is the role of the transconductance error amplifier in the MC34262DR2G?
The transconductance error amplifier monitors the average output voltage of the converter over several line cycles and provides a controlled voltage-to-current gain.
- Does the MC34262DR2G have any protective features against overcurrent?
Yes, it includes cycle-by-cycle current limiting and a multiplier output clamp to limit maximum peak switch current.
- Can the MC34262DR2G be used in high-frequency switching power supplies?
Yes, it is suitable for use in high-frequency switching power supplies due to its advanced power factor correction capabilities.
- Is the MC34262DR2G available in Pb-Free packages?
Yes, Pb-Free packages are available for the MC34262DR2G.
