Overview
The MC33364D1R2 is a critical conduction mode SMPS (Switch-Mode Power Supply) controller produced by onsemi. This component is part of the MC33364 series, which is optimized for high-density power supplies requiring minimal board area, reduced component count, and low power dissipation. The MC33364D1R2 features an internal 126 kHz frequency clamp and is designed to operate in critical conduction mode, ensuring efficient and reliable power conversion.
The device includes several key features such as lossless off-line startup, leading edge blanking for noise immunity, a watchdog timer to initiate switching, and over-temperature protection. It is also Pb-free and halide-free, making it environmentally friendly.
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 | - | - | - | - |
| Feedback Pin to Output Delay | tDLY | 100 | 232 | 400 | ns |
| Source Resistance (Drive = 0 V, VGate = VCC − 1.0 V) | ROH | 10 | 36 | 70 | Ω |
| Sink Resistance (Drive = VCC, VGate = 1.0 V) | - | - | - | - | Ω |
| Line Startup Current (VLine = 50 V) (VCC = Vth(on) − 1.0 V) | ILine | 5.0 | 8.5 | 12 | mA |
| Operating Junction Temperature | TJ | -25 | - | 125 | °C |
| Operating Ambient Temperature | TA | -25 | - | 125 | °C |
| Storage Temperature Range | Tstg | -55 | - | 150 | °C |
Key Features
- Lossless Off-Line Startup: The device integrates a high voltage startup, saving approximately 0.7 W of power compared to resistor bootstrapped circuits.
- Leading Edge Blanking for Noise Immunity: Enhances the device's robustness against noise.
- Watchdog Timer to Initiate Switching: Ensures the output switching is initiated correctly.
- Over Temperature Protection: Protects the device from overheating.
- Optional/Adjustable Frequency Clamp: Limits EMI and allows for adjustable frequency settings.
- Pb-Free and Halide-Free: Environmentally friendly packaging.
- Shutdown Capability: Allows for system shutdown when necessary.
- Zero Current Detector: Ensures critical conduction mode operation.
- Current Sensing Comparator and Cycle-by-Cycle Current Limiting: Provides precise current control and protection.
Applications
The MC33364D1R2 is suitable for various high-density power supply applications, including:
- Cellular Phone Chargers: Efficient power conversion for mobile devices.
- Battery Chargers: Optimized for charging batteries in portable devices.
- Universal Input Battery Chargers: Versatile charging solutions for different battery types.
- Critical Conduction Mode Flyback Converters: Used in applications requiring high efficiency and reliability.
- General Power Supplies: Suitable for a wide range of power supply needs requiring minimal board area and low power dissipation.
Q & A
- What is the operating temperature range of the MC33364D1R2?
The operating temperature range is from -25°C to +125°C.
- Does the MC33364D1R2 have an internal frequency clamp?
Yes, the MC33364D1R2 has an internal 126 kHz frequency clamp.
- What is the purpose of the zero current detector in the MC33364D1R2?
The zero current detector ensures critical conduction mode operation by monitoring the voltage on the auxiliary winding during the demagnetization phase of the transformer.
- Is the MC33364D1R2 Pb-free and halide-free?
Yes, the device is Pb-free and halide-free, making it environmentally friendly.
- What is the maximum power dissipation of the MC33364D1R2 at TA = 70°C?
The maximum power dissipation is 450 mW for the SO-8 package and 550 mW for the SO-16 package.
- What is the function of the watchdog timer in the MC33364D1R2?
The watchdog timer initiates output switching to ensure proper operation.
- How does the MC33364D1R2 handle over-temperature conditions?
The device includes over-temperature protection to prevent damage from overheating.
- What is the storage temperature range for the MC33364D1R2?
The storage temperature range is from -55°C to +150°C.
- Can the frequency clamp in the MC33364D1R2 be adjusted?
No, the MC33364D1R2 has a fixed internal frequency clamp of 126 kHz. However, the MC33364D model allows for adjustable frequency settings.
- What are some typical applications of the MC33364D1R2?
Typical applications include cellular phone chargers, battery chargers, universal input battery chargers, and critical conduction mode flyback converters.
