Overview
The MC33364D2, produced by onsemi, is a variable frequency Switch Mode Power Supply (SMPS) controller that operates in the critical conduction mode. This device is optimized for high-density power supplies, requiring minimal board area, reduced component count, and low power dissipation. The MC33364D2 integrates a high voltage startup circuit, saving approximately 0.7 W of power compared to traditional resistor bootstrapped circuits. It is designed for modern consumer electronic power supplies, particularly for applications requiring universal input voltage from 85 Vac to 265 Vac without additional startup components.
Key Specifications
| Characteristic | Symbol | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| Reference Output Voltage (IOut = 0 mA, TJ = 25°C) | Vref | 4.90 | 5.05 | 5.20 | V |
| Line Regulation (VCC = 10 V to 20 V) | Regline | % | |||
| Operating Temperature Range | TA | -25°C | 125°C | °C | |
| Maximum Operating Current | A | ||||
| Maximum Output Current | A | ||||
| Switching Frequency | 126 kHz (adjustable) | kHz | |||
| Package Type | SO-8, SO-16 |
Key Features
- Lossless Off-Line Startup: Integrates a high voltage startup circuit, reducing power consumption.
- Leading Edge Blanking for Noise Immunity: Enhances noise immunity during switching operations.
- Watchdog Timer to Initiate Switching: Ensures reliable operation by initiating output switching.
- Zero Current Detector: Ensures critical conduction operation, reducing switching losses and EMI.
- Current Sensing Comparator: Monitors and controls current levels.
- CMOS Driver and Cycle-by-Cycle Current Limiting: Provides efficient and safe operation.
- Optional/Adjustable Frequency Clamp: Allows designers to adjust the frequency clamp to limit EMI.
- Shutdown Capability and Over Temperature Protection: Enhances reliability and safety.
- Pb-Free and Halide-Free Device: Compliant with environmental regulations.
Applications
The MC33364D2 is widely used in various applications requiring efficient and reliable power supply solutions, including:
- Consumer Electronic Power Supplies: Suitable for universal input voltage from 85 Vac to 265 Vac.
- Battery Chargers: Used in 12V battery chargers and other charging applications.
- Portable Electronics: Ideal for power supplies in portable devices due to its high efficiency and low power dissipation.
- Industrial Power Supplies: Used in high-density power supplies requiring minimal board area and reduced component count.
Q & A
- Q: What is the operating temperature range of the MC33364D2?
A: The operating temperature range is -25°C to +125°C.
- Q: Does the MC33364D2 have an internal frequency clamp?
A: The MC33364D2 does not have an internal frequency clamp, but it can be adjusted by connecting appropriate values of resistance.
- Q: What are the key advantages of the critical conduction mode in the MC33364D2?
A: The critical conduction mode reduces switching losses, EMI, and allows for the use of smaller and less expensive MOSFETs.
- Q: How does the high voltage startup circuit benefit the MC33364D2?
A: The high voltage startup circuit saves approximately 0.7 W of power compared to traditional resistor bootstrapped circuits.
- Q: What types of packages are available for the MC33364D2?
A: The MC33364D2 is available in SO-8 and SO-16 packages.
- Q: Does the MC33364D2 have over temperature protection?
A: Yes, the MC33364D2 includes over temperature protection for enhanced reliability and safety.
- Q: What is the purpose of the watchdog timer in the MC33364D2?
A: The watchdog timer initiates output switching to ensure reliable operation.
- Q: Is the MC33364D2 compliant with environmental regulations?
A: Yes, the MC33364D2 is a Pb-Free and Halide-Free device, compliant with environmental regulations.
- Q: Can the MC33364D2 be used in battery charging applications?
A: Yes, it is commonly used in 12V battery chargers and other charging applications.
- Q: What is the typical application circuit for the MC33364D2?
A: Typical application circuits include critical conduction mode flyback converters and universal input battery chargers.
