Overview
The MC33364D1R2G is a variable frequency Switch Mode Power Supply (SMPS) controller produced by onsemi. It operates in the critical conduction mode and is optimized for high-density power supplies that require minimal board area, reduced component count, and low power dissipation. This controller integrates a high voltage startup circuit, saving approximately 0.7 W of power compared to traditional resistor bootstrapped circuits. The MC33364 series is designed for off-line flyback converters in modern consumer electronic power supplies, supporting universal input voltages 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 |
| Operating Temperature Range | TJ | -25°C | - | 125°C | °C |
| Maximum Operating Current | Icc | - | - | 16 mA | mA |
| Maximum Output Current | Iout | - | - | 220 / 600 mA | mA |
| Switching Frequency | fsw | - | 126 kHz | Up to 150 kHz | kHz |
| Maximum Supply Voltage | VCC | - | - | 16 V | V |
| Package Type | - | - | - | SOIC-8 | - |
Key Features
- Lossless Off-Line Startup: Integrates a high voltage startup circuit, saving power compared to traditional resistor bootstrapped circuits.
- 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 and Cycle-by-Cycle Current Limiting: Provides robust current control and protection.
- Shutdown Capability and Over Temperature Protection: Offers additional safety features for the power supply.
- Optional/Adjustable Frequency Clamp: Helps limit EMI by adjusting the switching frequency.
- Pb-Free and Halide-Free Device: Compliant with environmental regulations.
Applications
The MC33364D1R2G is suitable for various high-density power supply applications, including:
- Off-line flyback converters in consumer electronics.
- Universal input battery chargers (e.g., 12V battery chargers for portable devices).
- Single output power supplies for cellular phones and other portable devices.
- High-efficiency power supplies requiring minimal board area and low power dissipation.
Q & A
- What is the operating temperature range of the MC33364D1R2G?
The operating temperature range is from -25°C to +125°C.
- What is the maximum supply voltage for the MC33364D1R2G?
The maximum supply voltage is 16 V.
- Does the MC33364D1R2G have an internal frequency clamp?
Yes, the MC33364D1 has an internal 126 kHz frequency clamp, which can be adjusted by connecting appropriate resistance values.
- What are the key features of the MC33364D1R2G?
Key features include lossless off-line startup, leading edge blanking, watchdog timer, zero current detector, current sensing comparator, and optional/adjustable frequency clamp.
- What type of package does the MC33364D1R2G come in?
The MC33364D1R2G comes in an SOIC-8 package.
- Is the MC33364D1R2G Pb-Free and Halide-Free?
Yes, the device is Pb-Free and Halide-Free, making it compliant with environmental regulations.
- What are some typical applications for the MC33364D1R2G?
Typical applications include off-line flyback converters, universal input battery chargers, and single output power supplies for consumer electronics.
- How does the critical conduction mode benefit the SMPS design?
The critical conduction mode reduces switching losses, EMI, and allows for the use of smaller and less expensive MOSFETs by preventing discontinuous conduction mode.
- Does the MC33364D1R2G have over temperature protection?
Yes, the device includes over temperature protection for enhanced safety.
- Can the MC33364D1R2G be used for universal input voltage applications?
Yes, it supports universal input voltages from 85 Vac to 265 Vac without additional startup components.
