Overview
The MC33364D1G is a variable frequency SMPS (Switch-Mode Power Supply) controller from onsemi, designed to operate in the critical conduction mode. This controller is optimized for high-density power supplies, requiring minimal board area, reduced component count, and low power dissipation. It features an on-board reference, UVLO (Under-Voltage Lockout) function, a watchdog timer, a zero current detector, a current sensing comparator, leading edge blanking, and a CMOS driver with cycle-by-cycle current limiting. The integration of high voltage startup saves approximately 0.7 W of power compared to resistor bootstrapped circuits.
Key Specifications
| Parameter | Value |
|---|---|
| Number of Outputs | 1 Output |
| Switching Frequency | Up to 150 kHz (internal 126 kHz frequency clamp for MC33364D1G) |
| Duty Cycle - Max | 50% |
| Output Voltage | 4.9 V to 5.2 V |
| Topology | Flyback |
| Control Mode | Current Mode |
| UVLO (V) | Yes, typically around 5.5 V |
| Short Circuit Protection | Yes |
| Soft Start | No |
| VCC Max (V) | 16 V |
| Drive Capacity (mA) | 220 / 600 mA |
| Package Type | SOIC-8 |
| Operating Temperature Range | -25°C to +125°C |
Key Features
- Lossless Off-Line Startup: Saves approximately 0.7 W of power compared to resistor bootstrapped circuits.
- Leading Edge Blanking for Noise Immunity: Enhances noise immunity during operation.
- Watchdog Timer to Initiate Switching: Ensures reliable switching operation.
- Zero Current Detector: Ensures critical conduction operation.
- Current Sensing Comparator and Cycle-by-Cycle Current Limiting: Provides robust current control and protection.
- CMOS Driver: Efficient and reliable driver for the power stage.
- Optional/Adjustable Frequency Clamp: Limits EMI by adjusting the frequency clamp.
- Over Temperature Protection: Protects the device from overheating.
- Shutdown Capability: Allows for system shutdown when necessary.
Applications
The MC33364D1G is suitable for various high-density power supply applications, including:
- Offline power supplies requiring minimal board area and low power dissipation.
- Consumer electronics such as TVs, monitors, and other household appliances.
- Industrial power supplies where reliability and efficiency are critical.
- Telecommunication equipment and networking devices.
Q & A
- What is the primary operating mode of the MC33364D1G?
The MC33364D1G operates in the critical conduction mode.
- What is the typical switching frequency of the MC33364D1G?
The switching frequency is up to 150 kHz, with an internal 126 kHz frequency clamp for the MC33364D1G.
- Does the MC33364D1G have built-in over temperature protection?
- What is the operating temperature range of the MC33364D1G?
The operating temperature range is -25°C to +125°C.
- Does the MC33364D1G support shutdown capability?
- What type of topology does the MC33364D1G support?
The MC33364D1G supports flyback topology.
- What is the maximum duty cycle of the MC33364D1G?
The maximum duty cycle is 50%.
- Does the MC33364D1G have a built-in UVLO function?
- What is the typical UVLO voltage for the MC33364D1G?
The typical UVLO voltage is around 5.5 V.
- What package types are available for the MC33364D1G?
The MC33364D1G is available in SOIC-8 package.
