Overview
The MC33364D series, produced by onsemi, are variable frequency Switch-Mode Power Supply (SMPS) controllers that operate in the critical conduction mode. These controllers are optimized for high-density power supplies, requiring minimal board area, reduced component count, and low power dissipation. The integration of high voltage startup saves approximately 0.7 W of power compared to resistor bootstrapped circuits, enhancing efficiency.
Key Specifications
| Parameter | Value | Description |
|---|---|---|
| Operating Frequency | Up to 150 kHz | Variable frequency with optional internal frequency clamp (126 kHz for MC33364D1 and MC33364D) |
| Operating Temperature Range | -25°C to +125°C | Wide temperature range for various applications |
| Package Type | SOIC-8, SOIC-16 | Available in different package types to suit various design needs |
| UVLO (Under Voltage Lock Out) | Yes | Protects the device from operating below the minimum voltage threshold |
| Short Circuit Protection | Yes | Provides cycle-by-cycle current limiting and short circuit protection |
| Over Temperature Protection | Yes | Ensures the device operates within safe temperature limits |
| Shutdown Capability | Yes | Allows for shutdown of the device when necessary |
| Drive Capacity | 220 / 600 mA | CMOS driver with specified drive capacity |
Key Features
- Lossless Off-Line Startup: High voltage startup saves power compared to traditional resistor bootstrapped circuits
- Leading Edge Blanking for Noise Immunity: Enhances noise immunity during operation
- Watchdog Timer to Initiate Switching: Ensures timely initiation of output switching
- Zero Current Detector: Ensures critical conduction operation
- Current Sensing Comparator and Cycle-by-Cycle Current Limiting: Provides robust current sensing and protection
- Optional/Adjustable Frequency Clamp: Limits EMI by adjusting the frequency clamp
Applications
The MC33364D series is suitable for high-density power supplies in various applications, including:
- Consumer electronics
- Industrial power supplies
- Automotive systems
- Communication and computing devices
These controllers are particularly useful where space is limited, and low power dissipation is crucial.
Q & A
- What is the operating frequency range of the MC33364D series?
The MC33364D series operates at frequencies up to 150 kHz, with optional internal frequency clamps (126 kHz for MC33364D1 and MC33364D)
- What are the available package types for the MC33364D?
The MC33364D is available in SOIC-8 and SOIC-16 package types
- Does the MC33364D have over temperature protection?
Yes, the MC33364D includes over temperature protection to ensure safe operation
- What is the purpose of the watchdog timer in the MC33364D?
The watchdog timer initiates output switching, ensuring timely operation
- How does the MC33364D save power during startup?
The MC33364D saves approximately 0.7 W of power through its high voltage startup feature, compared to resistor bootstrapped circuits
- Does the MC33364D have short circuit protection?
Yes, the MC33364D includes cycle-by-cycle current limiting and short circuit protection
- What is the operating temperature range of the MC33364D?
The operating temperature range is -25°C to +125°C
- What are some common applications for the MC33364D series?
Common applications include consumer electronics, industrial power supplies, automotive systems, and communication and computing devices
- Does the MC33364D have UVLO (Under Voltage Lock Out) protection?
Yes, the MC33364D includes UVLO protection to prevent operation below the minimum voltage threshold
- How does the leading edge blanking feature work in the MC33364D?
The leading edge blanking feature enhances noise immunity during operation
